Form Display

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- Previous
 - 1
 - key events doesn't work Hi. I got some problem with the key events, they doesn't rise. first I made a new win project in C#, and I set this.KeyPreview = true; also this.KeyUp += new System.Windows.Forms.KeyEventHandler(this.fClient_KeyUp); and then I test run the app, and the keyup event did evoke. then I added a brower control into the form private AxSHDocVw.AxWebBrowser mviewer; and test run the app again, but this time the keyup didn't evoke, I assume the the browser control took the key events, how do I let the parent form evoke the key events again? and the browser control seems don't have any key event handler, am i right? any help would be greatful. regards Steve p Tag: Form Display Tag: 89008
 - 2
 - Command button shortcut key Hi! i have a form in VB.Net with two command buttons CmdDelete and CmdAdd i need to add shortcut keys for example F8 for CmdDelete and F4 for CmdAdd but i don't have any code. could someone plz show me a sample code... Best wishes Tag: Form Display Tag: 89005
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 - Enter key in Text box I have a problem while using Enter key in text box. when user presses enter in the text box information of customer is loaded. and I have a clear button that clears all the controls on the form. first it works properly. then I click on some other button (say detail button) that opens some other form. after closing that form if clear the form using clear button and again enter Id in text box and press enter. it does not work instead click event of Detail button is fired. Again I clear the form and press enter in the text box then it works and shows the data in controls. It happens several times. I am able to trace that. Control does not enter in event handler of key press event when this problem happen. no error is coming in any of the processes and no default button is set. Any solutions to this problem? -- Regards, Lalit Bhatia Tag: Form Display Tag: 89003
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 - Custom Designer Hi, I'm writing a control called a validating submit button. Basically, you can tell it to validate a number of controls when the user hits this button. When they hit the button, it'll say, "You must enter yada yada..." and highlight the bad field. Ok, now that I've got that out of the way, I think this problem should be relatively easy. Basically, I created a special designer that was a form that had two lists, one of available controls, and one of controls it will validate, in order. It would then add these items an arraylist of the inherited button class. This seems to work fine! I can run my custom verb, have it open up and show all the items that are currently selected to be validated and all of that jazz, but it doesn't change the actual .vb file in the InitializeComponent sub of the test form. So basically, it can change all these values on the design-time copy of the actual control, but I can't figure out how to add code to the initialize component of the form that'll be using this control. I figure that this question ought to be rather easy, as being able to create a custom designer without being able to "save your changes," so to speak, is pretty useless, and probably a commonly asked question. Thanks for your time! Bryce Covert. Tag: Form Display Tag: 89002
 - 5
 - Windows XP doesn't restore its desktop background after closing a smart client app Hi, I have developed a smart client app and deployed it. In some of the client machines, they have set a desktop background image. When the user works with the smart client app and close after opening few windows forms, the windows xp desktop image have some rectangular borders all over it which were the size of the opened windows forms in the smart client. Can anyone tell me how to refresh the desktop background image in xp? Thank you. Tag: Form Display Tag: 88999
 - 6
 - Sometimes clicking on a TreeView node doesn't select it Hi; I have this case where when I click on a line in my TreeView, it selects it for a second, and then moves the selection back to the previous selection. Usually I have to click 3 times to get it to stick - then it's fine from then on. The tree is not set to accept drag/drop. HideSelection=false, otherwaise all is standard. This is the only event I have for the control - and it is the only control in the form: private void Tree_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e) { TreeNode node = treeDB.GetNodeAt(e.X, e.Y); if (node == null) return; RootNode root = node.Tag as RootNode; if (root == null) return; DoDragDrop(new DragDropData(app, root), DragDropEffects.Copy); } Any ideas? -- thanks - dave Tag: Form Display Tag: 88998
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 - How to get user information from the local system user accounts. I am hoping to be able to (easily) write a program that will go into the local computer (as long as you are logged in as the administrator) and get information about the existing user accounts. I want to do this for LOCAL accounts on computers that are NOT members of a windows 2000 domain. Can someone point me to the correct document/example that shows how this could be done. I have found many many many examples for Windows 2000 domains, but none for local system accounts. Tag: Form Display Tag: 88996
 - 8
 - Smart Client - Update from MSI Code? What code do I have to add to my application to get it to check for updates, then re-install itself via an MSI file? Any simple examples out there? Tag: Form Display Tag: 88995
 - 9
 - Want form on top of, but no in, non-.NET window Hi; I used the Win32:SetParent to set the parent of a Form to the Window of the app it is in (Word). This forced the form to stay within the main window of Word. How can I set a Form so it is always above the Word window - but not restricted to being within it? -- thanks - dave Tag: Form Display Tag: 88994
 - 10
 - Want Form.CLose to Hide() Hi; I have a modeless form (not modal). I want when the user clicks on the X that it hides instead of closes. I was going to handle this in the Closing event but I also need to be able to close the window at some time - so that won't work. So, any suggestions? Also, is there a call I can make on a Form to see if it has been closed? -- thanks - dave Tag: Form Display Tag: 88993
 - 11
 - use project variables throughout solution currently i have a solution with 8 projects. In the Client project there is a form called ListSer i would like to use in my Rpts project. Client is the startup project, so can't reference to it. Is there a way to use the ListSer form in my Rpts project? Is there a way to create global variables for the Solution? would that work? Tag: Form Display Tag: 88988
 - 12
 - Dropping Email i dont know if this is the right group but... i need to know how i can get an email message that is droped on my form, and manage it content, for example attachments and other stuff Thanks Tag: Form Display Tag: 88987
 - 13
 - custom shaped form I want to create a small app that uses a jpg as the main form's "face" (i.e. windows media). I downloaded a sample app from codeproject and noticed that, in the main code, the developer actually went through and built up the region with a bunch of AddCurve() and AddLine() calls. Isn't there a way to accomplish the custom shape by using a transparent color in the bitmap? Also, what's the best or most common method of using an image for the form? Thanks, ~billy Tag: Form Display Tag: 88985
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 - WinForms and COM Interop I've a .NET WinForms application. The forms needs to be showed from a VB6 application. I wrote a simple class "COMWrapper" registered for COM Interop that instances the appropriate form and show it. The problems appeara when I show a MessageBox from the form. When I press OK the parent form "disapper". The form has this behavior ONLY with the ShowInTaskBar = FALSE Any ideas? Thanks in advance Massimo Tag: Form Display Tag: 88984
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 - GUI from code Back in February I asked if anyone knew of a code-based presentation layer / layout manager. There are two: MyXAML (http://www.myxaml.com) lets you instantiate components such as forms and controls through markup rather than code. It uses an XML markup language (though not Longhorn's MSAvalon). MyXAML is open source. CoderForm (http://www.fivetuple.com) takes a different approach by keeping the UI spec within code, but wrapping the UI classes (Forms, controls etc) to make it easy to define the interface from code). Take your pick. Tag: Form Display Tag: 88982
 - 16
 - Error when committing the row to the original data store What types of issues cause DataGrid to throw up this message box when changing a cell value to some new legal cell value, and navigating away from the row? Tag: Form Display Tag: 88980
 - 17
 - special line feed character appear in notepad - windows form - c sharp hello members, i m using windows form c# using follwoing code StreamWriter sw = new StreamWriter(new FileStream(@"c:\anyTextFile.txt", FileMode.Append)); sw.WriteLine("this is test text \n now from here is next line"); sw.Flush(); sw.Close(); i m trying to write a simple text file, when i open that file in any text pad it shows data as follow //** this is test text now from here is next line **// but when i open that file in windows notepad it shows data as follow //** this is test text ? now from here is next line **// that is theres sum square box inplace of linefeed, i want if i open same file in notepad it shows same as of textpad, why it is not showing, how to overcum that . regards.. -- Message posted via DotNetMonster.com http://www.dotnetmonster.com/Uwe/Forums.aspx/winform/200506/1 Tag: Form Display Tag: 88978
 - 18
 - ReadOnly Hi All, How do I make all my Controls on the C# windows Form readonly.? -SARADHI Tag: Form Display Tag: 88972
 - 19
 - opening form only one time Which is the best way to prevent opening a form which is already open? my program has an mdiparent form and when the user opens frmcustomers, can edit records. now if the user again opens this form a new instance will be created and the same form opens again. what i can do to prevent this? I'm using VB .Net and winxp ------------------ Dim myfrm as new frmcustomers myfrm.show -------------------- regards Tag: Form Display Tag: 88969
 - 20
 - Crystal drill down export Now suppose you have 30 stores located in 4 regions North, South, East, West and you have a sales report developed in crystal that groups by the region. You would really like to be able to create 4 export files one for each region. what would you do. i don't have a problem exporting the report but how do i create a separate file for each item in the group? -- Message posted via http://www.dotnetmonster.com Tag: Form Display Tag: 88967
 - 21
 - Creating a Simple Updater Hi I have in each of my clients Application directory (30) several files and subfolder sometimes I need to update just a specific .mdb or .txt or .exe or only the app.config . I have tried to do something using the UpdatedApplicationBlock but because of my Directory structure and the variety of files, it seem too much complicated to me, and I want the update process be done for the person in front of the PC. I have my FTP server. I want to write a little program to do this: When somebody press the ButtonA: a) Go to my FTP Site b) Download the File named myNewFile1.xxx c) Move c:\MyApp\Dir1\myOldFile.xxx to a backup folder d) Move myNewFile1.xxx to Directory c:\MyApp\Dir1 I think this is not hard to do, but I need some orientation Thks Tag: Form Display Tag: 88966
 - 22
 - Application disappears from Alt-tab task list when displaying CollectionForm When a CollectionEditor displays a CollectionForm (by clicking on a Collection in a PropertyGrid) the application icon is no longer shown in the task list displayed using the Alt-tab key. Any suggestions how to fix this? Do I need to modify style of CollectionForm to do this? How can I do this? Tag: Form Display Tag: 88963
 - 23
 - DragEventArgs and GetDataPresent with abstract base class Hello: I am trying to build a drag-and-drop operation with a control derived from my abstract base class. The control is either a PictureControl or a PictureGroupControl, both of which have PictureComponentControl as their superclass. When handling a DragOver event, I'd like to treat the dragged object as a PictureComponentControl without having to explicity test for whether the object is a PictureControl OR a PictureGroupControl, but GetData/GetFormats/GetDataPresent seem to only work with the subclass, not with the superclass. I've even tried explicitly casting the object when I begin the DoDragDrop() operation, but even then it doesn't seem to stick. Any advice for me? I know I could test for both subclasses explicitly, but that seems like bad OO -- then, in the future when I invent a SuperPictureControl, I'll have trouble. Is there a better way to do this, perhaps using Reflection or an Interface? Thank you, /m Tag: Form Display Tag: 88958
 - 24
 - Validation of data in win forms 2.0, Insert I am developing an application that requires the user to add and or change data. The application will be coded in winforms using .net 2.0. I am struggling a bit to understand how to implement validation of the data. A simple example is a table the has Description and Remarkscolumn. The Description is a required field. It must be non blank. I have implemented a dataset for this table and have implemented validation in the OnColumnChanging event in the datasets partial class. I have wired this into an errorprovider component on the winform. THis works as I expected on an update. The validation logic successfully finds the blank column and stops the user from entering a blank value. An insert does not work as I expected. The OnColumnChanging event does not seem to get fired on an insert. Any help would be appreciated. Tag: Form Display Tag: 88955
 - 25
 - IDisposable objects as fields in a Windows Form Hi to all. I have a Windows Form. I have a field in my form class which implements IDisposable. When I should call Dispose to that object? Is correct to call Dispose of all IDisposable objects in the OnClosed method of the form? Thanks, Pino. Tag: Form Display Tag: 88952
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 - Event Log? Hi all, I've written a window service which needs to write to the event log from time to time based on certain events. Apart from a minor issue at the moment where the actual log isn't created and it uses the "Application" one, I always get the following: "For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp." added to the bottom of each of my "information" type event log entries. As you are aware there are the following types: Error FailureAudit Information SuccessAudit Warning Does anyone know of any way to either turn off that line from the log entry, or, add my own 'types' to the event log types so that I can use my own "RobsInformation" for example as a type that doesn't display that surpurflous link.... Any information would be really appreciated. I have other applications (obviously), installed on my PC, and things like Norton AV write to the event log with "information" type entries, but they dont have URL's back to MS. In an ideal scenario here I'd be able to add my own URL pointing to a web page that gives details of the error message (as MS do). Thanks in advance for any help. Regards Rob Tag: Form Display Tag: 88950
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 - CD-ROM suspends the application execution Hi to all. I'm writing an application which should read data from CD-ROM. I have the application started and I I insert the CD-ROM in the reader. Subsequently, I click the button for read the data, but the Windows Form not respond for a couple of seconds. Are there any methods to read the CD-ROM in the background without having the form in not responding status? This is the same problem when I insert the CD-ROM in Windows Explorer... Thanks, Pino. Tag: Form Display Tag: 88946
 - 3
 - Transparent Label Control - Text Refresh Problem I have created a class file for Transparent Label and it works. But when I placed the control in the form designer, the text inside the label is not displayed. I have to move the control or press ALT+TAB to refersh the text. Any tips to overcome this problem? My Code: Imports System Imports System.Windows.Forms.Design Imports System.ComponentModel Imports System.ComponentModel.Design Imports System.Drawing Imports System.Drawing.Drawing2D Imports System.Drawing.Text Imports System.Windows.Forms Public Enum Direction ' Fields AntiClockwise = 1 Clockwise = 0 End Enum Public Enum Orientation ' Fields Arc = 1 Circle = 0 Rotate = 2 End Enum Public Class DesignStaticText Inherits System.Windows.Forms.Control ' Fields Private m_rotationAngle As Double ' Private text As String Private m_textDirection As Direction Private m_textOrientation As Orientation <Bindable(False), Browsable(False)> Public Shadows Property Visible() As Boolean Get Return MyBase.Visible End Get Set(ByVal Value As Boolean) MyBase.Visible = Value End Set End Property Public Sub New() MyBase.SetStyle(ControlStyles.SupportsTransparentBackColor, True) Me.m_rotationAngle = 0 Me.m_textOrientation = Orientation.Rotate Me.BackColor = Color.Transparent End Sub Public Sub InvalidateEx() If (Not MyBase.Parent Is Nothing) Then Dim rect As Rectangle rect = New Rectangle(MyBase.Location, MyBase.Size) MyBase.Parent.Invalidate(rect, True) Else End If Invalidate() End Sub Protected Overrides Sub OnFontChanged(ByVal e As EventArgs) Me.InvalidateEx() End Sub 'Protected Overrides Sub OnLocationChanged(ByVal e As EventArgs) ' Me.InvalidateEx() 'End Sub Protected Overrides Sub OnPaintBackground(ByVal pevent As PaintEventArgs) End Sub ' Properties Protected Overrides ReadOnly Property CreateParams() As CreateParams Get Dim params As CreateParams = MyBase.CreateParams params.ExStyle = (params.ExStyle Or 32) Return params End Get End Property <Description("Rotation Angle"), Category("Appearance")> _ Public Property RotationAngle() As Double Get Return m_rotationAngle End Get Set(ByVal value As Double) m_rotationAngle = value InvalidateEx() 'MyBase.Invalidate() End Set End Property <Category("Appearance"), Description("Direction of the Text")> _ Public Property TextDirection() As Direction Get Return m_textDirection End Get Set(ByVal value As Direction) m_textDirection = value 'MyBase.Invalidate() InvalidateEx() End Set End Property <Category("Text"), Description("Text to display")> _ Public Overrides Property Text() As String Get Return MyBase.Text End Get Set(ByVal value As String) MyBase.Text = value InvalidateEx() End Set End Property <Category("Appearance"), Description("Kind of Text Orientation")> _ Public Property TextOrientation() As Orientation Get Return m_textOrientation End Get Set(ByVal value As Orientation) m_textOrientation = value InvalidateEx() End Set End Property Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs) Dim i As Integer Dim graphics As Graphics = e.Graphics graphics.SmoothingMode = SmoothingMode.HighQuality graphics.TextRenderingHint = TextRenderingHint.AntiAlias Dim stringFormat As StringFormat = New StringFormat stringFormat.Alignment = StringAlignment.Center stringFormat.Trimming = StringTrimming.None Dim textBrush As Brush = New SolidBrush(Me.ForeColor) 'Getting the width and height of the text, which we are going to write Dim width As Single = graphics.MeasureString(Text, Me.Font).Width Dim height As Single = graphics.MeasureString(Text, Me.Font).Height 'The radius is set to 0.9 of the width or height, b'cos not to 'hide and part of the text at any stage Dim radius As Single = 0.0F If (ClientRectangle.Width < ClientRectangle.Height) Then radius = ClientRectangle.Width * 0.9F / 2 Else radius = ClientRectangle.Height * 0.9F / 2 End If Select Case (m_textOrientation) Case Orientation.Arc 'Arc angle must be get from the length of the text. Dim arcAngle As Single = (2 * width / radius) / Text.Length If (TextDirection = Direction.Clockwise) Then For i = 0 To Text.Length - 1 graphics.TranslateTransform(CType((radius * (1 - Math.Cos(arcAngle * i + RotationAngle / 180 * Math.PI))), Single), CType((radius * (1 - Math.Sin(arcAngle * i + RotationAngle / 180 * Math.PI))), Single)) graphics.RotateTransform((-90 + CType(RotationAngle + 180 * arcAngle * i, Single)) / CType(Math.PI, Single)) graphics.DrawString(Text.Chars(i).ToString(), Me.Font, textBrush, 0, 0) graphics.ResetTransform() Next Else For i = 0 To Text.Length - 1 graphics.TranslateTransform(CType((radius * (1 - Math.Cos(arcAngle * i + RotationAngle / 180 * Math.PI))), Single), CType((radius * (1 + Math.Sin(arcAngle * i + RotationAngle / 180 * Math.PI))), Single)) graphics.RotateTransform((-90 - CType(RotationAngle - 180 * arcAngle * i, Single) / CType(Math.PI, Single))) graphics.DrawString(Text.Chars(i).ToString(), Me.Font, textBrush, 0, 0) graphics.ResetTransform() Next End If Exit Select Case Orientation.Circle If (TextDirection = Direction.Clockwise) Then For i = 0 To Text.Length - 1 graphics.TranslateTransform(CType((radius * (1 - Math.Cos((2 * Math.PI / Text.Length) * i + RotationAngle / 180 * Math.PI))), Single), CType((radius * (1 - Math.Sin((2 * Math.PI / Text.Length) * i + RotationAngle / 180 * Math.PI))), Single)) graphics.RotateTransform(-90 + CType(m_rotationAngle, Single) + (360 / Text.Length) * i) graphics.DrawString(Text.Chars(i).ToString(), Me.Font, textBrush, 0, 0) graphics.ResetTransform() Next Else For i = 0 To Text.Length - 1 graphics.TranslateTransform(CType((radius * (1 - Math.Cos((2 * Math.PI / Text.Length) * i + RotationAngle / 180 * Math.PI))), Single), CType((radius * (1 + Math.Sin((2 * Math.PI / Text.Length) * i + RotationAngle / 180 * Math.PI))), Single)) graphics.RotateTransform(-90 - CType(m_rotationAngle, Single) - (360 / Text.Length) * i) graphics.DrawString(Text.Chars(i).ToString(), Me.Font, textBrush, 0, 0) graphics.ResetTransform() Next End If Exit Select Case Orientation.Rotate 'For rotation, who about rotation? Dim angle As Double = (RotationAngle / 180) * Math.PI graphics.TranslateTransform((ClientRectangle.Width + CType((height * Math.Sin(angle)), Single) - CType((width * Math.Cos(angle)), Single)) / 2, (ClientRectangle.Height - CType((height * Math.Cos(angle)), Single) - CType((width * Math.Sin(angle)), Single)) / 2) graphics.RotateTransform(CType(RotationAngle, Single)) graphics.DrawString(Text, Me.Font, textBrush, 0, 0) graphics.ResetTransform() Exit Select End Select End Sub Protected Overrides Sub OnLocationChanged(ByVal e As System.EventArgs) MyBase.OnLocationChanged(e) If Not IsNothing(Me.Parent) Then Me.Parent.Refresh() End If End Sub End Class Thanks Prabu Raju Tag: Form Display Tag: 88942
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 - Controls layout save/load Hi Is there a way to save the layout of controls (position, size, visibility, appearance etc.) to a file (xml?) and also be able to load the layout from a file? The idea being that these file scan serve as templates for different clients who may have different preferences. Is someone has worked with this and can post some code examples then that would be highly appreciated. Thanks Regards Tag: Form Display Tag: 88940
 - 5
 - book Recommendations I'm looking for a good book on .net data base using N-Tire Examples. Tag: Form Display Tag: 88939
 - 6
 - URGENT: printer control from code hi there.. i want to scroll down printer after printed a page can anyone help me? thanks... Tag: Form Display Tag: 88936
 - 7
 - Property with browsable = true does not show in Properties This is my first attempt to create a custom control. I have set the Browsable attribute (see below)and rebuilt the application but I cannot get the property to show on the Properties form. The control and all that it inherits from Control do show. Am I missing something? Thanks, Nigel B <Description("The size of the label shown in the client area"), Category("Appearance"), Browsable(True)> _ Public Property LabelSize(ByVal pSize As Size) As Size Get Return mLabelRealSize End Get Set(ByVal pValue As Size) ChangeLabelSize(pValue) End Set End Property -- Nigel Barton Tag: Form Display Tag: 88931
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 - Problems editing datagrid bound to altered datatable I have loaded a DataTable from SQL server table via SQLDataAdapter as a basis. Once filled, I add columns that are calculated, and found via other methods. This includes tooltip text specific to the row, row foreground and background colors, and data parsed from text files on disk. And even artificial rows to indicate to the user where there are missing database records. I bind the datasource/datatable to a DataGrid. The display comes up fine. I try to edit some cell, expecting it to ONLY update the in-memory dataset/datatable, and I get this message box when run outside the IDE: Error when committing the row to the original data store. Object reference not set to an instance of an object. Do you want to corret the value? [yes] [no] BTW - When run in the IDE in DEBUG It merely throws an exception, shows 3 threads, each with no call stack. I have to run without the debugger in order to get this message box which at least gives some clues I don't understand, rather than no clues at all. Is this because of the extra columns and/or extra rows I may have added SINCE the fill? I observe it happens REGARDLESS of adding extra rows. If so, does this mean I must create my own IList for binding, or such, or is there some way of ferreting out the cause for the error. Also, I notice I get errors of this nature when trying to enter invalid dates, for example. I need to take control of the data posting. I will be responsible for programmatically updating SQL when the user is done. Anything you can point me to to get my head wrapped around this would be greatly appreciated. I would like to take more control of cell data validation. Tag: Form Display Tag: 88926
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 - Process.Start() and winword Hi all, I launch documents (whatever extension) with the following code: System.Diagnostics.ProcessStartInfo startInfo = new ProcessStartInfo(attachmentFilePath); editAttachmentProcess = Process.Start(startInfo); This works fine for a number of document types/applications. However, if the file is a .doc and Word is launched, the "process" variable gets a value only if Word was not running already because Word will open documents in an existing instance. The problem is that the variable "editAttachmentProcess" is null when launching a .doc and Word was running already. I wish to manipulate the Process (e.g. attaching an event handler to .Exited etc.) - what is the best way to get the process that the document was opened in, given that a new instance might not have actually started? I thought of the following approach: 1) Get the application that is associated with the extension via Win32 calls 2) Cycle through all the processes (Process.GetProcesses), then cycle through each open window in the process to see if document is open therein. Any other ideas/suggestions? Regards Joubert Tag: Form Display Tag: 88921
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 - datagrid tablestyles problem Hi, Im Sure this is a standard question and one of those its easy if you know how. Basically I am returning a dataset from sql server with five fields but only want to display to columns in my datagrid populated from two fields from the dataset So ive a) created a grid datagridstyle b) Ive created a datatable to map the data from my dataset c) Ive retrieved the data from sql server and copied the appropriate fields to the grids datatable It appears that all the styles are being ingnored and all the data from the sql data set are being displayed Any Ideas ? Code included TIA Private objEventParamDT As New DataTable("eventParamDT") Private Sub populate_eventParams(ByVal p_nIdEvent As Integer) Dim objDataSet As DataSet Dim objEventParamRow, objDataRow As DataRow Try objDataSet = objEvent.getEventArgList(p_nIdEvent) Call create_eventParamDataTable() Call create_EventParamsGrid() For Each objDataRow In objDataSet.Tables("results").Rows objEventParamRow = objEventParamDT.NewRow objEventParamRow("argSeq") = objDataRow("argSeq") objEventParamRow("argDesc") = objDataRow("argDesc") objEventParamDT.Rows.Add(objEventParamRow) Next With dgEventParams .DataMember = "eventParamDT" .DataSource = objEventParamDT End With MsgBox(dgEventParams.TableStyles.Item(0).GridColumnStyles.Item(0).HeaderText) Catch ex As Exception setStatus(ex.Message) End Try End Sub Private Sub create_eventParamDataTable() Dim nLeventId As New DataColumn("idLeventArg", GetType(Integer)) Dim nSeq As New DataColumn("argSeq", GetType(Integer)) Dim cArgDesc As New DataColumn("argDesc", GetType(String)) With objEventParamDT ' .Columns.Add(nLeventId) .Columns.Add(nSeq) .Columns.Add(cArgDesc) End With End Sub Private Sub create_EventParamsGrid() Dim gts As New DataGridTableStyle dgEventParams.TableStyles.Clear() gts.MappingName = "EventParamData" ' Set other properties. gts.AlternatingBackColor = Color.LightGray ' Add a GridColumnStyle and set its MappingName ' to the name of a DataColumn in the DataTable. ' Set the HeaderText and Width properties. ' Dim txtEventId As New DataGridTextBoxColumn ' With txtEventId ' .MappingName = "idLeventArg" ' .HeaderText = "" ' .Width = 0 ' .ReadOnly = True ' End With ' Dim txtSeq As New DataGridTextBoxColumn With txtSeq .HeaderText = "Seq" .MappingName = "argSeq" .Width = 10 .ReadOnly = True End With gts.GridColumnStyles.Add(txtSeq) Dim txtDesc As New DataGridTextBoxColumn With txtDesc .HeaderText = "Description" .MappingName = "argDesc" .Width = 200 .ReadOnly = True End With gts.GridColumnStyles.Add(txtDesc) With dgEventParams .TableStyles.Add(gts) .CaptionText = "Event Parameters" End With End Sub Tag: Form Display Tag: 88919
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 - Apply a theme to a dot net application Hi, I want to know if it is possible to apply a custom made skin/xp theme to an individual dot net application. What I am trying to do is create a new skin\xp theme (e.g. Different style scroll bars) and then get my dot net application to use this. This way no other applications are compromised. Does anyone know if this is possible and if so how? Thanks Glen Tag: Form Display Tag: 88918
 - 12
 - Get Windows icons for files in a ListView? Let's say I know a file extension and I want to get the Windows icon for that type of file, and put that icon in the image for an item in a list view. Would this be possible without loading all possible Windows icons into the image list at compile time? In other words, is there a way to dynamically put in the image for a list view item at runtime, and get it from Windows based on the extension type? Tag: Form Display Tag: 88917
 - 13
 - Having trouble with simple data binding Hello, I have two labels, call them leftLabel and rightLabel, that start off next to each other. leftLabel has its autosize property set to true. What I am trying to do is bind rightLabel.Left to leftLabel.Right so that whenver the autosizing label changes size due to longer text, the right label will always be drawn right after it. I started an empty form and added the two labels. Then I have in the constructor: public Form1() { InitializeComponent(); rightLabel.DataBindings.Add("Left",leftLabel,"Right"); } I also have a textbox and in its text changed event I just set leftLabel's text to whatever is in the text box. The thing is, eventhough leftLabel changes size, and its Right property is changed, rightLabel does not move. What am I doing wrong? Thanks, -Flack Tag: Form Display Tag: 88913
 - 14
 - Problem with advanced Master-Detail grids Okay, I'm having an issue I'm hoping you can help me with. I have two datagrids in a Master-Detail relationship. The top is vehicles, the bottom is a mileage log. The mileage log should only show the entries for the vehicle selected in the vehicles grid. Here's the standard way that I keep finding to set up this scenario: 1) add a relationship to the DataSet, 2) set the master grid's DataSource to the DataSet, and set it's DataMember to the master table in the dataset 3) set the detail grid's DataSource to the DataSet, and set it's DataMember to the relationship Voila, supposedly. The problem is, I can't let people add records to the master grid using the append row. Instead, I have Add, Edit, and Delete buttons that do the appropriate action through a different form. To disable the Append row, you have to create a DataView for your master grid and set it's AllowAddNew property to false. Fine, but if my master grid is bound to the DataView instead of directly to the dataset, it gets it's own CurrencyManager, which means the detail grid won't stay syncronized with the selection in the master grid. To get around this, I've hooked into the PositionChanged event of the DataView that controls my master form. In that event handler, I set the RowFilter property of the DataView to which my detail form is bound. That filters the visible rows down to the ones matching the selected record in the master grid. This solution creates another problem, though, because now when I add a detail row using the DataGrid's append row, it doesn't have any knowledge of the relationship, so it doesn't fill in the parent ID correctly. I'm getting around this problem by hooking in to the ColumnChanged event of the DataTable that represents the detail table. That code looks like this (remember that GasMileageLog is the detail table, and Vehicles is the parent table): private void GasMileageLog_ColumnChanged(object sender, DataColumnChangeEventArgs e) { DSMileage.GasMileageLogRow row = (DSMileage.GasMileageLogRow)e.Row; DataColumn col = e.Column; // set VehicleID to the currently selected vehicle if it is unset if ( row.IsVehicleIDNull() ) { CurrencyManager cm = (CurrencyManager)BindingContext[dvVehicles]; DSMileage.VehiclesRow vrow = (DSMileage.VehiclesRow)((DataRowView)cm.Current).Row; row.VehicleID = vrow.VehicleID; } } Now, this almost works. It's so close I can taste it. But there's one more problem. Remember how I said you modify records in the master table with Add, Edit, and Delete buttons? Well, if you use the Add button to add a new record into the master table, the ID that .NET generates for it isn't the actual ID that gets written into the database. This is good, because .NET doesn't know what IDs are actually in the database, and we don't want it to cause collisions. But it's bad, because when I try to use the above code to write a new detail record that should be related to a master record that hasn't been written into the database, the detail records end up associated with nothing once everything is saved to the database with the adapter.Update() method. Granted, I could get rid of my problem entirely by having the Add button save directly to the database. But so far, the whole thing is playing nicely with disconnected datasets, so I have cancel buttons that abandon all the changes up to now, including any new master records and any changes or additions to the detail records. I'd really like to keep it that way if at all possible. And this has got to be possible. I'm open to alternate approaches. If I need to go back to using the relationship instead of syncing the detail records to the master records manually, that's fine, but I will need to know how to turn off the append row without using a dataview. Either that, or I'll need to know how to hook a dataview up to a relationship. So far, I haven't found a way to do either of those things. Any ideas? Charlie Kilian ckilian@lutzsoftware.com Tag: Form Display Tag: 88912
 - 15
 - Information on which application has focus Hi, Bit of a newbie question, but is it possible from the .net framework, to gather information on which application (managed or otherwise) currently has GUI focus? Thanks. Tag: Form Display Tag: 88910
 - 16
 - App Architecture question ? Hello, Iam starting on an application for an heat exchanger design. At the core, is a numerical solver that takes the HXInput instance and returns an HXResults instance. HXInputs is as follows : class HXInput { private HXAir mAir; private HXFin mFin; ...... // and so on. } Each of those HXAir and HXFin classes are huge, and contain info of the order of double [200, 200] Current design : # 1 SDI main form, that shows some info from HXInputs # 1 UI process controller that holds an instance of HXInputs, and the solver. The SDI form has an instance of UIP and sends menu commands to the UIP. Then the UIP shows different forms for editing information in HXInputs. # N different dialogs to display/edit different information in HXInputs and also a Tab page on SDI with results to show after the simulation is run. Heres the twist - There are dependencies between the data shown by different forms. Meaning - if one forms changes something in HXInputs, that affects some other UI options on other forms, or they need to be reflected on the main SDI window. What kind of architecture/pattern should be used for this app ? Iam looking for something that would allow easy addition of new data in HXInputs. I understand that this is too complex to explain, without figures, but would very much appreciate any advice. thank you. vikrantca Tag: Form Display Tag: 88909
 - 17
 - custom editor for TreeView nodes Hello you, I need Your HELP. I have my own TreeView Nodes Editor, in order to add 'MyTreeNode'', like node which are ComboBox and so. I have two classes. one inherit from 'TreeView' and the other from 'TreeNode'. In 'MyTreeView' i override 'Nodes' (keyword- new) in order to open my custom editor. In public partial class MyTreeView : TreeView, I use the next statement: [ DesignerSerializationVisibility(DesignerSerializationVisibility.Content), Editor(typeof(NodesTypeEditor), typeof(UITypeEditor)), ] new public TreeNodeCollection Nodes { get { return base.Nodes; } set { TreeNode[] myTreeNodeArray = new TreeNode[((TreeNodeCollection)value).Count]; ((TreeNodeCollection)value).CopyTo(myTreeNodeArray, 0); ((TreeNodeCollection)value).Clear(); this.Nodes.AddRange(myTreeNodeArray); } } but the DesignerSerializationVisibility create the next code, which produce casting error on run time: MyCheckTreeNode myCheckTreeNode1 = ((MyCheckTreeNode)(new TreeNode("TreeNode"))); I need it to be : MyCheckTreeNode myCheckTreeNode1 = new MyCheckTreeNode("TreeNode"); In the editor i use TreeView and PropertyGrid. the code in 'Add CheckBox Node' is: treeView1.Nodes.Add(new MyCheckTreeNode("TreeNode")); How can i fix it??? Please Help me. I need it fast. Thanks, Ran S' Tag: Form Display Tag: 88906
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 - Opening Mdi Child Maximized causes verticle scrollbar on parent... It happens with one of a number of sub-classed Mdi Child forms, but not all. Can't figure out why. Where should I be looking? Kyle! Tag: Form Display Tag: 88905
 - 19
 - (Rich)TextBox, scrolling, HideSelection Hi- In my application I have a RichTextBox, and I want to scroll it so that the character at a given index appears on the top line of the box. Up till now, I've used this routine, which works fine: == rtb.Focus(); rtb.SelectionStart=rtb.Text.Length-1; rtb.SelectionLength=0; rtb.SelectionStart=rtb.Text.IndexOf("MY_TEXT"); rtb.SelectionLength=0; == However, recently I've been adding a search feature, and as a result I've needed to set the RTB's HideSelection property to false. An unfortunate side-effect of this is that for some reason the above code no longer works. I've experimented with ScrollToCaret combinations, but the problem is that if MY_TEXT is visible on-screen but half-way down the textbox, then calling ScrollToCaret will never move the box. Does anyone have a solution? Cheers, Andy Tag: Form Display Tag: 88901
 - 20
 - How to create wizards? Hi; I know it's probably in the one place I didn't look but I have been over the docs and several books trying to find how to create a form that is a wizard and can't find it. How do I set up a wizard? -- thanks - dave Tag: Form Display Tag: 88895
 - 21
 - Forms Icon: The argument 'picture' must be a picture that can be used as a Icon. At designtime I can assingn a Form's Icon property to a .png file. In the generated code I see: Me.Icon = CType(resources.GetObject("$this.Icon"), System.Drawing.Icon) when I do this with the designer. I would like to make this assignment at runtime. I added two .png files to my Project and set them as Embedded Resources. I load the embedded resource in the below method inside the Form: Function GetEmbeddedIcon(ByVal strName As String) As System.Drawing.Icon Dim stream As System.IO.Stream Dim assm As System.Reflection.Assembly = Me.GetType().Assembly stream = assm.GetManifestResourceStream("CustomDataSystems.AMNET.Forms.Maintenance.UIElements" & "." & strName) Me.Icon = New System.Drawing.Icon(stream) End Function Where strName is the name of the png file. I get: "An unhandled exception of type 'System.ArgumentException' occurred in system.drawing.dll Additional information: The argument 'picture' must be a picture that can be used as a Icon." This implies to me you cannot assing a .png file to the Form's Icon property, though I can do this at designtime and I see the icon. Any idea what I am doing wrong here? Tag: Form Display Tag: 88892
 - 22
 - Does click event handler need to marshal onto main thread? If I have a form with a button and add a button_Click event handler, and within that handler I update the form's GUI, do I need to marshal onto the main thread? i.e. Do I need to do this: private void button1_Click(object sender, System.EventArgs e) { if (InvokeRequired) { Invoke(new EventHandler(button1_Click), new object[] {sender, e}); } else { button1.Text = "stuff"; } } I think what I'm asking is: Can form event handlers be on a different thread from the main thread? Any clarifcation on this appreciated! Boz Tag: Form Display Tag: 88886
 - 23
 - FindForm() returns nothing This is a multi-part message in MIME format. ------=_NextPart_000_0022_01C56CCF.58179DE0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I have a control class that inherits from ComboBox. The intention of = the constructor is to grab a reference to the BaseForm class of the form = containing the custom control and populate its members using cached data = from a "ClientCache" dataset in the base form. The constructor: Public Sub New() Me.Name =3D "cboItems" Dim bf As BaseForm =3D CType(Me.FindForm(), BaseForm) Me.DataSource =3D bf.ClientCache.Tables("MyItems") End Sub The code always dies on line 3 because Me.FindForm() always returns = Nothing, even though the combobox control is being used by a windows = form. (All our forms inherit from BaseForm, which inherits = Windows.Form.) VS.NET help indicates that FindForm "retrieves the form that the control = is on". But from all indications this is not the case. Thoughts? TIA. Mark ------=_NextPart_000_0022_01C56CCF.58179DE0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=3DContent-Type content=3D"text/html; = charset=3Diso-8859-1"> <META content=3D"MSHTML 6.00.2800.1498" name=3DGENERATOR> <STYLE></STYLE> </HEAD> <BODY> <DIV>I have a control class that inherits = from=20 ComboBox.  The intention of the constructor is to grab a reference = to the=20 BaseForm class of the form containing the custom control and=20 populate its members using cached data from a "ClientCache"=20 dataset in the base form.  The constructor:</DIV> <DIV> </DIV> <DIV> <DIV> Public <FONT=20 color=3D#0000ff>Sub New()   =20 Me.Name =3D "cboItems"   =20 Dim bf As BaseForm =3D <FONT=20 color=3D#0000ff>CType(Me.FindForm(), = BaseForm)   =20 Me.DataSource =3D = bf.ClientCache.Tables("MyItems") End <FONT=20 color=3D#0000ff>Sub</DIV></DIV> <DIV> The code always dies on line 3 = because Me.FindForm()=20 always returns Nothing, even though the combobox control is being = used by a=20 windows form. (All our forms inherit from BaseForm, which inherits=20 Windows.Form.) VS.NET help indicates that FindForm "retrieves the form = that the=20 control is on".  But from all indications this is not the=20 case. Thoughts? TIA. Mark</DIV></BODY></HTML> ------=_NextPart_000_0022_01C56CCF.58179DE0-- Tag: Form Display Tag: 88880
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 - Untrapped errors This is a question on how to resolve untrapped errors that appear to relate to bugs in winforms controls. I have a base Form designed with a set of tabpages. On derived forms I place an appropriate list control within a specific tabpage. I've been using a ListView in this way for some time with no problems. I have now derived a new Form with a DataGrid placed within the tabcontrol. Whilst this works OK most of the time, on odd occasions when I click the Tab to reveal another tabpage (not the one with the grid) I get an untrapped error which appears to derive from the tabControl. All my events have error trapping - including the tabControl SelectedIndexChanged - but this does not get fired before the error occurs, and none of my catch blocks get invoked. How do I get to the bottom of this - it presumably relates to adding the DataGrid to the form, but the events involved do not concern the DataGrid, and are mostly unchanged from the version using a ListView. Error shown below (trapped by my Untrapped Error handler in Main()): Untrapped or Fatal Error Application Shutting Down Object reference not set to an instance of an object. System.Windows.Forms at System.Windows.Forms.Control.SetVisibleCore(Boolean value) at System.Windows.Forms.Control.set_Visible(Boolean value) at System.Windows.Forms.TabPage.set_Visible(Boolean value) at System.Windows.Forms.TabControl.UpdateTabSelection(Boolean uiselected) at System.Windows.Forms.TabControl.OnSelectedIndexChanged(EventArgs e) at System.Windows.Forms.TabControl.WmSelChange(Message& m) at System.Windows.Forms.TabControl.WndProc(Message& m) at System.Windows.Forms.ControlNativeWindow.OnMessage(Message& m) at System.Windows.Forms.ControlNativeWindow.WndProc(Message& m) at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam) at System.Windows.Forms.UnsafeNativeMethods.SendMessage(HandleRef hWnd, Int32 msg, IntPtr wParam, IntPtr lParam) at System.Windows.Forms.Control.SendMessage(Int32 msg, IntPtr wparam, IntPtr lparam) at System.Windows.Forms.Control.ReflectMessageInternal(IntPtr hWnd, Message& m) at System.Windows.Forms.Control.WmNotify(Message& m) at System.Windows.Forms.Control.WndProc(Message& m) at System.Windows.Forms.ScrollableControl.WndProc(Message& m) at System.Windows.Forms.ContainerControl.WndProc(Message& m) at System.Windows.Forms.Form.WndProc(Message& m) at System.Windows.Forms.ControlNativeWindow.OnMessage(Message& m) at System.Windows.Forms.ControlNativeWindow.WndProc(Message& m) at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam) at System.Windows.Forms.UnsafeNativeMethods.CallWindowProc(IntPtr wndProc, IntPtr hWnd, Int32 msg, IntPtr wParam, IntPtr lParam) at System.Windows.Forms.NativeWindow.DefWndProc(Message& m) at System.Windows.Forms.Control.DefWndProc(Message& m) at System.Windows.Forms.Control.WmMouseDown(Message& m, MouseButtons button, Int32 clicks) at System.Windows.Forms.Control.WndProc(Message& m) at System.Windows.Forms.TabControl.WndProc(Message& m) at System.Windows.Forms.ControlNativeWindow.OnMessage(Message& m) at System.Windows.Forms.ControlNativeWindow.WndProc(Message& m) at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam) at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg) at System.Windows.Forms.ComponentManager.System.Windows.Forms.UnsafeNativeMethods+IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData) at System.Windows.Forms.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context) at System.Windows.Forms.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context) at System.Windows.Forms.Application.Run(Form mainForm) Tag: Form Display Tag: 88879
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 - how to access control property on MDI parent form Hi... i have created a MDI form and a MDI child form. i am supposed to enable or disable certain menu in the MDI parent form based on certain condition that occur. is there anyway of doing it like the old VB6 ways of direct manipulation . such as frmMDIParent.mnuAdd.Enabled = True if not what are the other way If txtName.text = "T"Then Dim frmParent As New frmMDIParent() frmParent.mnuAdd.Enabled = True frmParent.Show end if thanks stanly Tag: Form Display Tag: 88875

Hello,

I have designed a form in vb.net. I have placed a tab control with 3
tab pages on the form. This tab control holds many controls in each tab page.
This form is MDIChild form. I have not written much code on the form.
Whenever I run the project, form is dipslayed as textboxes first
then Data grid followed by another tab on the form and so on. Form does not
display all the controls at once as complete form.
What I should do in order to avoid this?

Early response is awaited..

-RbanBph

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