Moving a control on form with mouse event?

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  - 1
    - Book Help Can someone recommend a good VB.Net Windows Forms book? Most of the books I have found are too general on Windows Forms. They include too much on ASP.Net or other topics I don't need. Does anybody know why the Visual Basic Windows Forms books, references, guides, online help etc... is not really a major topic or a not quite as popular as Visual Basic 6. I know that it is still new but there isn't much out there. Erik Tag: Moving a control on form with mouse event? Tag: 56272
  - 2
    - Problem showing records in Columnar view I've been using dotNet for some time now and understand the basic concepts of data binding using datasets and DataViews. However, I am experiencing an odd behaviour in my program which I would like to explain below in plain English first. I can post the code later on if required. Please be patient with me as I try to explain my problem. It's been haunting me for days. First the basics ... I am using VB.Net with an MS Access database in the backend. I am using OleDbDataAdapter to populate my dataset. Also, there are no 3rd party controls being used. My Access database contains 2 tables - qMaster and qVersion. For the sake of simplicity, let's say that each record in the qMaster table can have anywhere upto 9 records (I'll call them Versions from now on) in the qVersion table. The key field in "qMaster" is [QuoteNo] and the key fields in "qVersion" are [QuoteNo] and [QuoteVr]. "qMaster" and "qVersion" are linked to each other via [QuoteNo]. I am able to create the OleDbDataAdapter, populate it with data from my tables and fill the DataSet with no problems at all. The problems start thereafter ... Here comes the first problem ... I would like to display all 9 versions (records) side-by-side as columns just like you would see in a spreadsheet, instead of showing them down the rows (for which I could have easily used a DataGrid). To achieve this goal, I created 9 DataViews against the DataSet where the RowFilter for each DataView is set to "QuoteVr=1", "QuoteVr=2", ... and so on. I've created a User Control with assorted text boxes (let's say 10 in total) in it for each of the fields in the "qVersion" table plus some extra calculated ones. I copied the UserControl 9 times onto my form and DataBound each UserControl to a different DataView. I've already created properties for each of the fields/textBoxes in the User Control so I can assign values and perform DataBindings easily. These 9 UserControls are sitting on the first TabPage of a TabControl on my form. On the second TabPage of the TabControl, I then went ahead and created 10 textBoxes same as what I did in the UserControl. These 10 boxes on the second TabPage are bound directly to the DataSet, so that I can navigate through the DataSet using the DataBinding's Position property. I am then capturing the "Enter" event of the UserControl (which is data-bound to the DataView) to determine which Version it is bound to and automatically navigate to the desired record on the second TabPage by setting the DataBinding's Position to the desired record position. So far so good. (Just as an aside - is this the best way to achieve my goal or is there an easier way to do it, i.e. display records as columns! I do not consider myself an expert and any help would be greatly appreciated). The problem starts when I start updating my textboxes. If I do any direct input into any of the textBoxes either within the UserControl on the first tabPage (bound to DataViews) or to the textBoxes on the second tabPage (bound directly to the DataSet), the values change properly between the two tabPages. However, anywhere that I use textBoxes to display calculated values end up behaving oddly. The calculated values show up properly on the 2nd tabPage (bound to DataSet directly) but when I hit the Update button, here is what it does ... it will go ahead and save any changed data that was directly input in the textBoxes but will not update any of the calculated textBox values. I know common logic dictates that you do not need to save any calculated values back in the database as you can recalculate these on-the-fly. However, my application demands this for other reasons. Also if I were to switch between the 2 tabPages I would loose all my calculated values, but not the ones directly entered. That's funny - I don't know how to explain this. Say I had to work with 3 fields only, 2 input and 1 output - and initially the 2 input fields show the values 2 and 3 and the output box (which just adds the 2 numbers) shows 5. Now if I change 2 to 4, the output box correctly shows 7 on the 2nd tabPage but if I switch to the 1st tabPage it reverts back to 5, but the input boxes are still showing 4 and 3. If I save the value 4 is correctly updated but the calculated value is not. I'm at a total loss here. I've tried using EndCurrentEdit but to no avail. I am guessing it has something to do with the CurrencyManager but don't know what to do. Please help. Regards - Behram Tag: Moving a control on form with mouse event? Tag: 56267
  - 3
    - Buttons on grid Hi How can I place a push button on each row of a grid? Thanks Regards Tag: Moving a control on form with mouse event? Tag: 56261
  - 4
    - Book Help Can someone recommend a book on C# WinForms? Tag: Moving a control on form with mouse event? Tag: 56260
  - 5
    - DataGrid Location I'm using VB.Net with Forms. I want users to be able to click a button and have the DataGrid cursor move to the NEW record location that is shown by the * On click event or form load the record that is showing in the datagrid is blank. Thanks. Tag: Moving a control on form with mouse event? Tag: 56259
  - 6
    - databinding not working for lookup combobox, please help! I'm having the worst time trying to get a combobox to synchronize with a datagrid. I have two tables: Products and ProductLines. One of the fields in the Products table is ProductLineID. I want a form that displays a datagrid showing the Products, and a separate combobox down-down control that shows the available product lines from the table of that name. When the user selects a row in the grid, I want the combobox to update with the correct value, and when the combobox is changed, I want the data for the selected row in the datagrid to update. Sounds easy, and I can get textbox databinding to work like a charm. I followed instructions from a Microsoft article on doing this combobox lookup, but it didn't work. This code runs when the form loads: SqlDataAdapter1.Fill(DataSet11) SqlDataAdapter2.Fill(DataSet11) DataSet11.Relations.Add(New DataRelation("Relation1", _ DataSet11.ProductLines.ProductLineIDColumn, _ DataSet11.Products.ProductLineIDColumn)) For the combobox, I set these properties in the Properties window: DataSource = DataSet11.ProductLines DisplayMember = ProductLineName ValueMember = ProductLineID I set the value member to the ProductLineID because I want to store the ID in the Products table, not the name text. Under the (DataBindings) section, it now reads: SelectedValue = DataSet11 - Products.ProductLineID When I run this simple app, the datagrid works fine. The combobox populates with all of the product lines, but when I select a product in the datagrid that has a different product line, the combobox doesn't update; and when I change the selection in the combobox, the ProductLineID field in the datagrid doesn't change. What am I missing? Tag: Moving a control on form with mouse event? Tag: 56255
  - 7
    - DataGrid Slider Bar Is there a way to hide the horizontal slider bar that appears at the bottom of a datagrid? I have set navigation to false, but all this did was disable the slider, not hide it. Thanks. JT Tag: Moving a control on form with mouse event? Tag: 56253
  - 8
    - Addhandler/Removehandler Hi all, We have developed some forms that dynamically build the controls and then need to add event handlers to them. Does anyone know the cumulative effect of adding handlers and not removing them? I have done Removehandler calls when the handler doesn't exist so I assume that the handlers are not maintained as a collection. Jim Tag: Moving a control on form with mouse event? Tag: 56251
  - 9
    - Re: Hot Key problems in MDI child forms I had the same problem and was able to get the following work around from Microsoft. The problem is that Winforms bubbles ProcessDialogChar up to the top level window, which in this case, is the MdiContainer. To work around the bug, you need to override the ProcessDialogChar method of the MDI child forms like the following: Protected Overrides Function ProcessDialogChar(ByVal charCode As Char) As Boolean If charCode <> " "c And ProcessMnemonic(charCode) Then Return True End If Return False ' Nmemonic is unhandled, Do not call base to bubble up to MDI container End Function 'ProcessDialogChar HTH, Don Worthley The Main Thing is to keep the Main Thing the Main Thing Anybody else seen this weird (wrong) behavior: This is a simplified explanation of the behavior in my app... MDI child form (call it form A) has a hot key assigned (say, for example, a command button that says 'Message', hot key on the M (text = &Message) which just displays a message box, and another button which opens a second MDI child form (call it form B). That all seems normal - here's where the app is behaving badly: 1) Open form A. 2) from form A, open form B 3) when B has focus, press Alt-M You will see that the hot key will be processed by form A, which DOES NOT HAVE THE FOCUS!!!! Not sure if this behavior is specific to MDI children forms and some sequence of opening them, but it should not function like that. Is this behavior actually something that I need to write code to trap? anybody else seen this? can you reproduce it? Tag: Moving a control on form with mouse event? Tag: 56248
  - 10
    - Suggestion What suggestions for C# WinForm books? Tag: Moving a control on form with mouse event? Tag: 56247
  - 11
    - should bound textbox change for combobox selection I have a combobox that is bound to a column of a table. I have a textbox bound to a second column in the same table. When the user makes a combobox selection, what do I have to do to cause the bound textbox to update with the value from the new row? Thanks! LuAnn Tag: Moving a control on form with mouse event? Tag: 56243
  - 12
    - Controls don't overlap on design form, but do at runtime I left a Microsft DevDays some months ago with the idea that if you anchored all of your controls to all four sides, then the screen would size up proportionally when the form was maximized or made larger. My current test form most emphatically does not do this - controls overlap on each other in a most ugly fashion. My scroll bar next to a multi line text box ends up half the width of the screen. The data grid on the top half and the edit box on the bottom half both expand to well over half the screen. Does anybody have any ideas on how to make a form size up gracefully? Tag: Moving a control on form with mouse event? Tag: 56241
  - 13
    - adding controls programmatically on winfform i try to add a group of linklabel to winform as following, but when running it, i can only see one linklabel added (the first one). Could anyone help me to solve it and tell me why? thanks jj --------------------------------------------------- LinkLabel[] lnkCase = new LinkLabel[caseCount]; for (int i = 0; i < caseCount; i++) { lnkCase[i] = new LinkLabel(); lnkCase[i].Text = dirs[i].Name; lnkCase[i].Name = dirs[i].Name; lnkCase[i].Location = new System.Drawing.Point(100 + i * 2, 80 + i * 2); lnkCase[i].Size = new System.Drawing.Size(272, 23); lnkCase[i].LinkClicked += new System.Windows.Forms.LinkLabelLinkClickedEventHandler (lnkCase_LinkClicked); this.Controls.Add(lnkCase[i]); } ----------------------------------------- Tag: Moving a control on form with mouse event? Tag: 56240
  - 14
    - ListView does not update internally ItemActivate or SelectedIndexChange events do not always update the SelectedIndices or SelectedItems properties. This has to be a bug. I'm using .NET Framework 1.1. Tag: Moving a control on form with mouse event? Tag: 56239
  - 15
    - Reactivation of a closed MDI Child In the parent of my MDI application I declare a child form private frmChild = null; which is to be activated on a menu click. In the click event I am using the following code: if (frmChild == null || !frmChild .IsHandleCreated) { frmChild = new frmChild (); frmChild .MdiParent = this; frmChild .Show (); } else frmChild .Activate(); This does not have the desired effect however; I am trying to avoid having to go through initialization each time the form is re-opened. I also need to make sure that only one instance of this form is opened at a time. Can anyone offer help? Thanks, Nate Tag: Moving a control on form with mouse event? Tag: 56235
  - 16
    - Newbie question/gripe I'm in my first couple hours with .NET 2003. I created a C++ project and started working on a Windows Form. Should .NET not be totally inappropriate to my purposes, I'll gradually start migrating a monolithic/Client Server app (currently using ADO) to it. On my first attempt to run my form I got a browser with a message that I should change the Web Services namespace for my project. My reaction was "What the h*ll are you doing in my face?". I intentionally chose Windows Forms over Web Forms because I don't want to run in a browser or over the web. I sure didn't get the form I had designed. What should I do to write applications that don't try to invoke HTTP without my permission and simply work on the machine they are running on? Thanks Randy Hersom Tag: Moving a control on form with mouse event? Tag: 56232
  - 17
    - VB.NET Rich Text Box control ( RichTextBox ) - adding custom hyperlinks Hello! What I want to do is be able to set a piece of text in the rich text box control so that it has a 'link' style. Then, whenever this piece of text is clicked on, the LinkClicked event is raised. In other words, I want the behaviour of a hyperlink without having to show the full url. Is this possible without having to manually change and detect the font styles myself? Thanks! Al. Tag: Moving a control on form with mouse event? Tag: 56230
  - 18
    - .net directory dialog Hello since there is no folder dialog controls in .net how to make such kind of things with existing controls? or any 3rd party controls is good? Tag: Moving a control on form with mouse event? Tag: 56229
  - 19
    - RichTextBox SelectionFont Issue When you select text in the RTF editor (C# code) that has different styles of font (i.e. part of the test is bolded and part is underlined) the selectionfont property is set to null. Is there any other way we can access all the available style for the selected text? Thanks Joseph Tag: Moving a control on form with mouse event? Tag: 56227
  - 20
    - invoking on UI thread I understand the notion that a UI thread should be responsible for managing the UI elements; therefore, worker threads need to call invoke on a control. I don't understand the technical reason for this. What is it about the Win32 message loop that doesn't like worker threads to update the UI and why does it work anyway (at least most of the time)? Thanks for shedding some light, Paul Tag: Moving a control on form with mouse event? Tag: 56226
  - 21
    - Unloadable Control Is it possible to implement a control that can be loaded into, and later unloaded from current the process when it is no longer needed? I've been able to do this with other classes by subclassing MarshalByRefObject, putting it in it's own assembly, and loading it into its own AppDomain (which can later be unloaded). But as far as I can tell, this isn't as easy with a System.Windows.Form.Control descendant (even though they descend from MarshalByRefObject). The first problem I've run into is that as soon as I try to use the control (which was created in a different AppDomain), I get a SerializationException because the ControlCollection class (of the parent) is not a descendant of MarshalByRefObject (or serializable). Apparantly, controls need to reference that collection in some way, when they are added to the parent (which is in the original AppDomain in this situation). So my question is, is there some way to implement an unloadable control, where all it's code is in an assembly that can be loaded-into/unloaded-from the process? There may be workarounds, like just making the code behind the control's events unloadable, and not the control itself. But for my purposes, the control wouldn't be generic enough for something like that. A good analagy would be a user control for implementing a propery sheet. Any ideas? -Ethan Tag: Moving a control on form with mouse event? Tag: 56225
  - 22
    - Rich Text Box control ( RichTextBox ) Drag and Drop problem Hello! I have tried a few things to get drag and drop to work in the rich text box control. The best example I have come across is point 22.3 of: http://www.syncfusion.com/FAQ/WinForms/FAQ_c89c.asp#q572q However, there is a slight problem in that the drag and drop does not work if the *very first* drag and drop operation you do is from within the control itself (i.e. dragging from and dropping into the control). The drop cursor changes to the 'prevent drop' cursor (/). After this first attempt though, drag and drop works fine! Can anybody help? Even the MSDN help isn't useful (to be honest it just doesn't work - http://support.microsoft.com/default.aspx?scid=kb;en-us;814309) Thanks, Al. Tag: Moving a control on form with mouse event? Tag: 56224
  - 23
    - Drag and Drop between ListView and TreeView.?! I've got a treeview and listview program which i would like to add a drag and drop utility to it. i've managed to drag and drop items from the treeview to the listview, from the treeview to itself. but i cudn't do the same from the listview to the treeview.?!! i would like to be able to drag and drop items/nodes from both to either one of them and update the data automatically and refresh the controls. I don't know how to do this and i've got a very short time to do it. Any help, examples or comments would be very much appreciated. Thank you in advance. Regards, Kam The treeview looks like: Level1 --Level2 ---Level3 and the code i've developed is as follows: //----------------------------------------------------- private void treeView1_ItemDrag(object sender, System.Windows.Forms.ItemDragEventArgs e) { treeView1.DoDragDrop (e.Item, DragDropEffects.Move); } private void listView1_DragEnter(object sender, System.Windows.Forms.DragEventArgs e) { if (e.Data.GetDataPresent (typeof (TreeNode))) e.Effect = DragDropEffects.Move; //All or Copy (try) } private void listView1_DragDrop(object sender, System.Windows.Forms.DragEventArgs e) { if (e.Data.GetDataPresent (typeof (TreeNode))) { TreeNode tn = (TreeNode) e.Data.GetData (typeof (TreeNode)); listView1.Items.Add (tn.Text, tn.ImageIndex); treeView1.Nodes.Remove (tn); } } private void listView1_ItemDrag(object sender, System.Windows.Forms.ItemDragEventArgs e) { listView1.DoDragDrop (e.Item, DragDropEffects.Move); } private void treeView1_DragEnter(object sender, System.Windows.Forms.DragEventArgs e) { e.Effect = DragDropEffects.Move; } private void treeView1_DragDrop(object sender, System.Windows.Forms.DragEventArgs e) { TreeNode NewNode; if(e.Data.GetDataPresent("System.Windows.Forms.TreeNode", false)) { Point pt = ((TreeView)sender).PointToClient(new Point(e.X, e.Y)); TreeNode DestinationNode = ((TreeView)sender).GetNodeAt(pt); NewNode = (TreeNode)e.Data.GetData("System.Windows.Forms.TreeNode"); if(DestinationNode!= NewNode) { DestinationNode.Nodes.Add((TreeNode) NewNode.Clone()); DestinationNode.Expand(); //Remove Original Node NewNode.Remove(); } } } //--------------------------------------------------- Tag: Moving a control on form with mouse event? Tag: 56216
  - 24
    - How to Remove or Hide a row in datagrid? How I can remove or hide a row datagrid without removing from database ? Tag: Moving a control on form with mouse event? Tag: 56214
  - 25
    - MyMainMenu - Urgent Please correct your system date/time. -- Herfried K. Wagner MVP · VB Classic, VB.NET http://www.mvps.org/dotnet Tag: Moving a control on form with mouse event? Tag: 56210
- Next
  - 1
    - Vertical toolbar Hi, I need to set the orientation of the toolbar .. so that I can have a toolbar that comes up vertical and also if I attach a splitter it should resize buttons also I am not able to resize buttons as width is a private property of the button. Thanks Rajesh. Tag: Moving a control on form with mouse event? Tag: 56208
  - 2
    - Changing values in DataRow Hi How can I change some values in the DataRow? I make a query to get some records out of database and then I want to change some, but it doesn't seem to work. With the following code, nothing gets set: foreach(DataRow myRow in Table1.Rows) myRow.ItemArray.SetValue("overwritten value", 0) myRow contains 3 columns and I would like to change the first one - index 0. Please help, Alen Tag: Moving a control on form with mouse event? Tag: 56207
  - 3
    - Strange ComboBox Binding Behaviour I am trying to bind multiple comboboxes here to the same datasource. I see a strange behaviour with reference to the time when the ComboBox actually gets its Items Collection populated. I am putting my Code in here. 2 functions (implementing the same functionality) which give me variable results. To give an idea what i am trying to achieve: I am developing a new Container Control (extending Panel)(i call it DataWindow) which supports a Grid as well as Free-Form layout. //----------- MY CODE--------------// // This Works Correctly // Gets called for the Free-Form as well as Grid Layout protected virtual void e_ComboBoxRetrieved() { // dwComboControl is a Class that stores information about // a single ComboBox Control placed on the DataWindow dwComboControl dwc; // icol_ComboControls is a custom collection of dwComboControl. // Thus a collection of all the ComboControlsthat the developer // may have placed on the DataWindow int i_ComboCount = this.icol_ComboControls.Count; ComboBox cb; DataTable dt; for(int i = 0; i < i_ComboCount; i++) { dwc = this.icol_ComboControls[i]; dt = DataUtil.GetDataTable(dwc.ComboSql); // if the layout is FreeForm, then bind the ComboBox if(this.dwLayout == dwLayoutType.FreeForm) { cb = dwc.ControlRef; cb.DataSource = dt; cb.DisplayMember = dwc.ComboDisplayCol; cb.ValueMember = dwc.ComboDataCol; // I Get the correct result of here. // ie. cb.Items.Count == dt.Rows.Count MessageBox.Show(cb.Name + " : " + cb.Items.Count.ToString() + " Rows : " + dt.Rows.Count.ToString() ); } else // Do not bind the ComboBox, just set the // reference of the retrieved DataTable to // dwComboControl's idt (instance DataTable) { dwc.idt = dt; } } } // Gets Called for Each Row retrieved in the Grid // I have used reflection here and replicated the controls // placed by the Developer during Design-Time into a new // Panel which is passed as a reference here. private void f_BindComboBox(dwDetailPanel adp) { ComboBox cb; dwComboControl dwc; // ie. for each ComboBox actually placed by the Developer // for a Single Row int i_ComboCount = this.icol_ComboControls.Count; for(int i = 0; i < i_ComboCount; i++) { dwc = this.icol_ComboControls[i]; // Get a Copy of DataTable to which this ComboBox is to // be Bound. Doing this to save Database trips for // binding ComboBox's for each row. // dwc.idt has been populated earlier in e_ComboBoxRetrieved() DataTable dt = dwc.idt.Copy(); // Get the Instance of ComboBox in the Current Panel cb = (ComboBox)adp.icol_ChildControls.GetControl(dwc.Name); // icol_ChildControls is a custom Collection (with a // HashTable implementaion). It is a collection of All // the controls placed on the Detail Panel cb.DataSource = dt; cb.DisplayMember = dwc.ComboDisplayCol; cb.ValueMember = dwc.ComboDataCol; // This is where i see inconsistent behaviour // ie. cb.Items.Count is 0 // dt.Rows.Count gives a correct Figure. MessageBox.Show(cb.Name + " : " + cb.Items.Count.ToString() + " Rows : " + dt.Rows.Count.ToString() ); } } //----------------------------------------------------------------// Further more, when my DataWindow (Grid) finally gets displayed, I find that all the ComboBox's in all the Rows retrieved do display the Bound Data correctly. The problem for me is, after each DetailPanel is created for each row retrieved for the Grid DataWindow, I have to set the ComboBox.SelectedValue to the value in the DataBase. When i go to do that, i find out that there are no Items in the ComboBox. This is how the events have been organised in my Control For Each DataRow 1) Create Host DetailPanel for the Row 2) Replicate all the ChildControls for the Row (using reflection) 3) Bind ComboBox's on the new DetailPanel 4) Set values of the Current Row in the DetailPanel End For I have double checked that these two functions are the only place where anything related to ComboBox is happening in my application. Anyone who is aware of such problems / has any idea why is this happening / any solution. Help is appreciated. -Snehal Tag: Moving a control on form with mouse event? Tag: 56200
  - 4
    - Print with feed tractor laserjet and customized papersize Hi, I have a problem with a laser feed tractor printer, paper size is 8.3 X 11 inc.. For print in windows xp home from a c# application i use a custom paper size added at the printer server properties. The problem is that i have to print a value near bottom margin (sheets are pre-printed), but if i use custom papersize this value will not printed, i think because there is a bottom margin, but in my custom paper size i have set all margins to 0.00 . Is there any solution? Is teher any way to set bottom margin to 0 (is a feed tractor printer!)? If i set custom paper size more height the bottom value is printer but the printer don't stop exacly at the end of the sheet, and the next print begin with a bigger upper margin. Also: - how can i user c# to add a custom print from to SO? - i have to use a print from, or i can simply use c# code to specify custom paper size? - how set printer papersize and papersource from c#? Thanks in advance, epederiva Tag: Moving a control on form with mouse event? Tag: 56199
  - 5
    - Paging in Windiws Datagrid. Hi, i am having one datagrid, i am fetching more than 25k records in that datagrid. At present i am displaying all the records in one grid. so the datagrid takes hell lot of time to fetch record from database and displaying it. Whether paging is allowed in Windows C# forms ? Or any other way to implement paging ? Thanking in Advance. Regards, Mahesh D. Rane LnTInfotech, Powai Mumbai. Tag: Moving a control on form with mouse event? Tag: 56189
  - 6
    - changing configuration file at runtime I want to ask how to modify the configuration file (windowapplication.exe.config) at runtime and keep this setting for the next time the program start? Tag: Moving a control on form with mouse event? Tag: 56187
  - 7
    - ListView.SelectedIndexChanged problem 1. ListView has Multiselect = true 2. I handle the above-mentioned event. 3. SelectedIndices collection has 0 elements when navigating by mouse-click or up/down arrow I need to have Multiselect on to support deleting multiple items at time. But I tried with multiselect=false, and I still get SelectedIndices collection with 0 elements. All this leads me to believe that .NET 1.1 ListView has a bug. Tag: Moving a control on form with mouse event? Tag: 56186
  - 8
    - ListView.SelectedIndices does not work When I tie to SelectedIndexChanged event. The SelectedIndices property has 0 items as I use the up/down arrows to navigate the listview. Tag: Moving a control on form with mouse event? Tag: 56185
  - 9
    - MDI Child Form Not Releasing DataSet I have an application that creates MDI child windows to edit different datatables in the same dataset. At one point in the application cycle, users have the opportunity to log off the database server (so they can reconnect to a different one). As part of that log off, I clear the dataset. Unfortunately, if an MDI child form has been opened and then closed, the datatable for that form hangs on the clear (i.e., aDataTable.Clear() stalls forever). This problem does not occur if that table's form has not been opened and closed. This seems to be a problem where the MDI child form, while "closed", is still maintaining a reference to the datatable (probably through databinding?). How do I get rid of this reference so that datatable can be cleared? I've tried setting the MDIParent property of the MDIChild form to null in an event handler for the MDIParent form that watches for MDIChild Close events, followed by a call to MDIChild.Dispose(). Unfortunately, that does't solve the problem. Any leads or workarounds would be greatly appreciated. - Mark p.s. BTW, this is looks to be the second "silent failure" of the NET Framework I've come across in the past week (the first had to do with the way the Framework's handling of DBNull values for bound DateTimePicker controls breaks the BindingContext.Position code, with no outward sign of a problem). I'm beginning to think the NET Framework design team didn't take enough advantage of exception handling in developing the Framework. Tag: Moving a control on form with mouse event? Tag: 56184
  - 10
    - automatic code generation I'm not sure if this is the right forum, but it has to do with the automatic code generation of a WinForm for the Compact Framework. Anyway, I thought I'd report an issue I've been having. I subclass a control to define my own button class that can draw custom images (since the CF does not permit this as is). Anyway, to add it to my winForm, I manually add it in among the automatically generated code, adding it to the proper tab control, etc. I build it, run it, and it works fine. Sometimes if I then hide the automatically generated code (w/ my newly added code interspersed) and proceed to edit the WinForm through the GUI interface provided in VS .NET 2003 C#, at some point, the code I intertwined w/ the automatically generated code disappears. I haven't nailed down the exact procedure that causes the problem b/c each test I have to re-write the inter-mixed code. Right now it isn't a big deal for me, but in the future it might become an issue. I suspect that at some point, the compiler may be re-generating the automatically generated code but doesn't realize I've edited it? Oh, and before it removes the code, an error might pop up saying my class is uninitialized, but if I build my project, it sees that it is initialized (among the auto-gen code) and builds fine. Tag: Moving a control on form with mouse event? Tag: 56183
  - 11
    - Alternative to TransparencyKey property? Hi, I'm trying to convert an application from C++ to CSharp. Under C++ I used the SetLayeredWindowAttributes() API to make parts of my form transparent. Now in CSharp, I was trying the forms TransparencyKey property. However, it doesn't work on my system with 32bit display and I found this confirmed by other posts on this topic. I asked myself if I could avoid this problem by dllimport-ing the API function. I'm very new to CSharp and Dotnet and could not get it working, yet. I would really appreciate if anyone could tell me what is wrong in the following code: //the original function signature /* BOOL SetLayeredWindowAttributes(HWND hwnd, COLORREF crKey, BYTE bAlpha, DWORD dwFlags ); */ //define the key constant private const int LWA_COLORKEY = 0x00000001; [DllImport("user32.dll", SetLastError=true)] public static extern int SetLayeredWindowAttributes(int hwnd, int cKey, byte bAlpha, int dwFlags); //in the forms constructor int ret = SetLayeredWindowAttributes(this.Handle.ToInt32(), 0x00FFFFFF, 0, LWA_COLORKEY); if(ret == 0) { try { throw new Win32Exception(); } catch(Exception err) { MessageBox.Show(err.Message); } } thanks for any ideas, Nick Tag: Moving a control on form with mouse event? Tag: 56177
  - 12
    - Mouse Events in Nested Controls Hi all, I am wondering what the "normal" behavior for mouse events(click,down, etc..) within nested controls is. Do the mouse events fire for the container control and the child control if you click on the child control? Or only the child control? or only the parent control? The reason I am asking is because I have a Panel which has many child Panels within it. When I hook up a mouse event (mousedown,click) to the parent, it does not fire when I click on the child control. I was hoping it would fire so I could use GetChildAtPoint to access the child control. The event DID fire when I clicked on part of the panel without a child control. I then opted to hook up the mousedown event inside my child control and simply have it act upon the parent control to do the work. Unfortunately, the event does not fire here either!? Am I missing something? Is there a property that must be set correctly to make this work? Thx in advance, Cole Tag: Moving a control on form with mouse event? Tag: 56176
  - 13
    - DataGrid and unbound text boxes I'm building a VB.Net Windows form application. I have a DataGrid and 5 unbound textboxes on a form. The DataGrid is populated with a OleDbDataAdapter and is using a table called Clients. What I want to do is have the users fill in the unbound textboxes and click a button and have those values inserted into the table clients. I will then refresh the datagrid and the new values will appear. I created a New Connection, A New DataSet and A New Select Command to the table Clients. When I Create a datarow like so: Dim drw2 As DataRow drw2 = DataSet1.Tables("tblClients").NewRow I recieve a error " Object reference not set to an instance of an object......" When I look up the error it looks like the new select command I've built is interfering with the one on the OleDbDataAdapter. Does anybody have any workaround ideas? Thanks Erik Tag: Moving a control on form with mouse event? Tag: 56172
  - 14
    - drop down list events I have created a drop down list and populated from db. When an item is selected, I want to then populate and make visible a second list based on the value of the first. My problem is that I can't get the selection to be detected... I have coded Sub ddlDistricts_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ddlDistricts.SelectedIndexChanged Dim wsGetAreas As New localhost.myWebservice1() dsAreas = wsGetAreas.GetAreas(ddlDistricts.ID, boolerr) ddlAreas.DataSource() = dsAreas ddlAreas.Visible() = True End Sub but the event never triggers.. What am I doing wrong? kate *** Sent via Developersdex http://www.developersdex.com *** Don't just participate in USENET...get rewarded for it! Tag: Moving a control on form with mouse event? Tag: 56171
  - 15
    - Can userControl's menu item have shortCut? Even if I set the shortCuts of a user control's menu items, they do not work. What's the tricks? Thanks, Tag: Moving a control on form with mouse event? Tag: 56170
  - 16
    - MyMainMenu - Urgent Hi I need to catch the event MouseDown and MouseUp on a MainMenu but this classe haven´t those methods. How can i write them?? Thank You Tag: Moving a control on form with mouse event? Tag: 56166
  - 17
    - Unable to add short key key to tab sheet in tab control Hello, I'm not able to add shortcut key to the tab sheet, which is a part of default tab control. If I place a '&' in the text property of the tab sheet, the ampersand chararter gets displayed in the tab sheet caption. If I add another ampersand, the second one is not shown. How do I add a shortcut key to the tab sheet. Deepak Kashyap MJ Tag: Moving a control on form with mouse event? Tag: 56165
  - 18
    - Memory Issue I am developing a application and I think I have a memory leak, but I am not sure. TESTS: 1: I open and close a edit window I have work on for 2 weeks the memory grows by 6MB 2: I open and close the same edit window with no code, no data just controls and the memory grows by 6MB 3: I create a brand new form with a couple of random controls and no code and I open and close it the using the same SUB, memory does not increase at all. Something seems to be wrong with my window however I have no idea what. Could someone give me some insight into why this would be happening. I really do not want to cut and paste all my code and controls into another window just to find out I still have the same problem. Tag: Moving a control on form with mouse event? Tag: 56163
  - 19
    - how to set focus on a combobox on a tab when the form is loaded? Hi, I have a form with 3 tabs and each tab has a combobox on it. When the form is loaded, I determine which tab to display based on parameters passed into the form's New() method. When the form is loaded, I would like to place the cursor in the combobox of the selected tab, place some text in the combobox, and highlight the text. However, not only am I unable to get the cursor in the combobox (combo.focus () executes, but does not do it), assigning the text to combo.text does not show the text in the combobox. combo.SelectAll combo.SelectedText = [my text] creates an error, apparently because combo has not been fully loaded yet. Any ideas how to get the text into the combobox, highlight the text, and put focus in the combo? Thanks, David Tag: Moving a control on form with mouse event? Tag: 56161
  - 20
    - how to set focus on control in a tab on tab click? Hi, When I click a tab on my form, I want a combobox on that tab to be given the focus (I want the cursor to be sitting in the combo, blinking, and if the user starts typing, the text should appear in the combo). Setting the focus from the tab.SelectedIndexChanged event does not do it. The combo seems to have focus (if I type, the characters appear in the combo), but the cursor is not visible until I click in the combo. Any thoughts? Thanks, David Tag: Moving a control on form with mouse event? Tag: 56159
  - 21
    - .NET DataGrid vs. 3rd party controls I have not done much work with .NET yet but we are trying to decide whether the grid that Microsoft provides is going to provide enough functionality for us. As far as VB 6, we use the Videosoft FlexGrid now and have found it to be very useful. Does anyone know what how good/bad the .NET grid is? Are there different versions for web forms versus windows forms? Any help would be appreciated. Thanks! Tag: Moving a control on form with mouse event? Tag: 56155
  - 22
    - Problem with Web Service and Inherited Forms Hallo, I have a big problem with Windows Forms and Web Services. When I add a Web Service to my solution, the forms inherited from other forms don't get opened in design mode and I get a reference error. Am I the only one who has got this problem? I have Visual Studio 2003 and framework 1.1 Please help me... Tag: Moving a control on form with mouse event? Tag: 56153
  - 23
    - Book Suggestions Please! I have had VS7 for about a year now and use C# mainly. The apps that I write are for my own use on the desktop so ASP/Web applications hold little interest for me. I tend to use the Win API a lot still but I suspect that there are better ways. I am looking for book(s) that give details of the various namespaces and the functionality within them (I know it's in the help but I can't read that in the bath) and especially any books that will ease the transition from the API to inbuilt functionality (assuming it's there). Books that show how to use the API for things like shell hooks and how to show the system context menu would be very much of interest. I liked the earlier Petzold books because they gave a complete breakdown of the API and also Appleman's book on VB6 and the API. I have I got Petzold's Programming Windows, Jesse Liberty's Programming C# and Mueller's .NET Framework Solutions. They look good on the face of it but are very basic once you get into them and really add nothing beyond the excellent help system in VS.Net. Any suggestions would be appreciated, those I have searched for usually end up being about writing Web apps rather than Windows Forms apps. Regards -- Jeff Gaines Damerham Hampshire UK Tag: Moving a control on form with mouse event? Tag: 56148
  - 24
    - How to detect closed form? I have opened form from another form and I have an variable with reference on it. But what if someone close referenced form? I tryed to test an variable on Nothing value but there is still reference on closed form. The questin is: How can I find out that the referenced form is closed. I have two ideas: 1) Exception handling 2) Handle closed event of closed form Is there some better way? And another problem. When a referenced form is closed, I can still run frm.Hide() without throwing exception, but frm.Show() fires exception. Object is closed, so why frm.Hide() doesn't throw the exception too? Thanks Martin Skrenek Tag: Moving a control on form with mouse event? Tag: 56144
  - 25
    - Data Entry via DataGrid Is it possible to do add records via a datagrid? For example, an application opens a datagrid with its source a datatable with 2 records. Can one add a third record to the source datatable via the datagrid? If so, how please? Thank you. JT Tag: Moving a control on form with mouse event? Tag: 56137

I am new to VB.Net and have done a little VB3 &4. Whith the advent of the
Net aspect oto OOP I would like to use a standard winform that a user can do
several things.

1. Place predetermined line shapes on the form and save their location with
the closing of the form.

2. I would like to add a saveable text/label control that is movable around
the form with the mouse. In other words I wlll want to drag the control from
one spot on the form to another location. Preferable the locations will dock
to the line image drawing on the form back ground.

Is this a simple matter or is it very complex? Thanks for any thoughts or
ideas to try.

Dazed and confused but loving the challange just the same.

Mark Gaeth
Decatur,IN

Re: Moving a control on form with mouse event? by Herfried

Herfried
Wed Sep 10 02:46:02 CDT 2003

Hello,

"Mark Gaeth" <mgaeth@mchsi.com> schrieb:
> 1. Place predetermined line shapes on the form and save their
> location with the closing of the form.
>
> 2. I would like to add a saveable text/label control that is
> movable around the form with the mouse.

http://www.mvps.org/dotnet/dotnet/samples/miscsamples/downloads/XmlSerialization.zip

--
Herfried K. Wagner
MVP · VB Classic, VB.NET
http://www.mvps.org/dotnet

Re: Moving a control on form with mouse event? by Mark

Mark
Wed Sep 10 05:21:06 CDT 2003

Thanks Herfried,

While I am not well versed in the german lanhuage I was able to read the
code to see were I was going wrong. I was trying to use the
cursor.current.postion..X for my arguments when I should have been using
e.x. Thanks for the tip/suggestion. Now to make many of these objects move
around and save to form an image.

Mark

"Herfried K. Wagner [MVP]" <hirf.nosp@m.activevb.de> wrote in message
news:OeVSX%232dDHA.576@tk2msftngp13.phx.gbl...
> Hello,
>
> "Mark Gaeth" <mgaeth@mchsi.com> schrieb:
> > 1. Place predetermined line shapes on the form and save their
> > location with the closing of the form.
> >
> > 2. I would like to add a saveable text/label control that is
> > movable around the form with the mouse.
>
>
http://www.mvps.org/dotnet/dotnet/samples/miscsamples/downloads/XmlSerialization.zip
>
> --
> Herfried K. Wagner
> MVP · VB Classic, VB.NET
> http://www.mvps.org/dotnet
>
>