DataGrid Event Problem

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  - 1
    - odd Bindings Hello: I first put the code and then I'll comment it: ... somewhere in Form_Load ... Binding binding = new Binding("Value", myTableDataView, "StartupDate"); binding.Format = new ConvertEventHandler(StartupDateBinding_Format); StartupDateDateTimePicker.DataBindings.Add(binding); ... private void StartupDateBinding_Format(object sender, ConvertEventArgs e) { if (e.Value == null || e.Value == DBNull.Value) e.Value = new DateTime(2003, 1, 1); } ... The problem comes when I do: ((CurrencyManager)BindingContext[myTableDataView]).AddNew(); The StartupDateBinding_Format method is not called, and an exception is thrown which says "DataBinding could not find a row in the list that is suitable for all bindings". It couldn't find a row suitable for all bindings, because my StartupDateBinding_Format method has not been called, and it cannot set the DateTime Value property of a DateTimePicker object to null or DBNull. And also I'm having trouble creating my own editor control: public class DateTimeEditBox : System.Windows.Forms.TextBox { private DateTime _value; public DateTimeEditBox() { DataBindings.CollectionChanged += new CollectionChangeEventHandler(DataBindings_CollectionChanged); } public DateTime Value { get { return _value; } set { if (value == _value) return; _value = value; ... if (ValueChanged != null) ValueChanged(this, EventArgs.Empty); } } public event EventHandler ValueChanged; private void DataBindings_CollectionChanged(object sender, CollectionChangeEventArgs e) { if (e.Action == CollectionChangeAction.Add) ((Binding)e.Element).Format += new ConvertEventHandler(Binding_Format); } private void Binding_Format(object sender, ConvertEventArgs e) { if (e.Value == null || e.Value == DBNull.Value) e.Value = new DateTime(2003, 1, 1); } } Well this control has the Format event handler embedded so I don't need to do a "binding.Format = new ConvertEventHandler(StartupDateBinding_Format);", but it's the same. But surprisingly this time the Binding_Format method is called and it works fine. But... when I change the Value property, the value in the bounded row doesn't change, even when I'm raising ValueChanged. And I checked that when I raise ValueChanged there is one method listening (ValueChanged is not null), which is the handler method generated by the Binding. No exception is thrown, nothing. And it should work because the column which I bound is a DateTime DataColumn. Why all this strange behavior? Maybe the bindings have problems with value/reference types? Or am I doing something wrong (I don't think so, but...)? By the way, I'm using Visual Studio .NET 2003 / .NET Framework 1.1. Thank you in advance. Samuel, from Spain Tag: DataGrid Event Problem Tag: 56309
  - 2
    - Custom Title Bar in VB.NET Hi, I'm building a custom layout Form (with FormBorderStyle none...) that completely repaint itself (title,borders, etc ...) How i must override the base properties and methods to correctly anchor a Main menu o a ToolBar below the title Label ?? Moreover, can anybody plz tell, how should I get the System Menu in the Taskbar even if FormBorderStyle is set to NONE. Thanks a tonne in advance ! Rahul Tag: DataGrid Event Problem Tag: 56306
  - 3
    - Building a combo box - can't get listbox to draw outside the form Hi all, I'm struggling with something I thought would be simple. I need to build a combo box from scratch as I need to do more alterations than an owner draw combo box will allow. I was always told a combo box was just a textbox and a listbox. Well, that's fine but the listbox is bound by the clipping region of the form. Thus if the combo is positioned near the bottom of the form, the listbox gets chopped off. I've tried creating a form for the listbox to sit on, and then move both to the relevant location. This is still buggy though as when you click in the listbox, the host form loses focus - and I also suspect creating a whole form just for this feature is not very efficient. There must be a way surely to do this in .NET through GDI+ or something. Essentially all I want is to fool .NET into drawing the listbox where I specify on the screen, without being bound by a forms drawing area. Any ideas? Thanks, Andrew Cuthbert Tag: DataGrid Event Problem Tag: 56303
  - 4
    - Owned forms in MDI Apllications I am developing a mdi application, and I would lke to make one MdiChild form owned by another MdiChild form. Is it possible ? I make something like this in the first form (owner form) to open the other (owned form) I woluld like they behave like owned and continue being mdi children forms. OwnedForm owned = new OwnedForm (); owned .Owner = this; owned .MdiParent = this.MdiParent; owned .Show(); The problem is the form is not owned anymore after setting the MdiParent property Can anybody help me with this? Thank you in advance Juan M. Cervera Tag: DataGrid Event Problem Tag: 56302
  - 5
    - Showing a dialog Hi How can I show a dialog from within the main form? frmdialog.show? Thanks Regards Tag: DataGrid Event Problem Tag: 56301
  - 6
    - Feature request: a better RichTextBox In the past two days, I've run up against several major limitations with the Framework RichTextBox (I'm sure there are others): 1. There's no Framework way to assign custom borders, and the FlatStyle border doesn't work properly (it draws a flat border around a 3D border -- go figure.) Your only option is the 3D border, which looks very dated and clashes with the Win XP styles. You can't even draw a custom border by handling the OnPaint event, because doing so prevents the text from displaying. The only alternatives are various API hacks and complex Framework workarounds. 2. The RichTextBox doesn't allow for embedding "helper" URL's, in which a friendly name or phrase is underlined instead of a URL. (Something that both the LinkLabel control and the underlying CRichEditCtrl20 control can do.) 3. There's no Framework method to prevent the RichTextBox from receiving the focus and displaying a caret. There are only clunky workarounds, none of which really works. (Disabling the RTF box, which changes its background color and (AFAIK) prevents the user from interacting with the scrollbars, using the NoCaret API, which must be resent frequently because it won't "stick", or programmatically changing the focus whenever the RTF box receives the focus.) This inflexibility makes using the RichTextBox a bit like buying a Model T Ford -- "you can have any color, as long as it's black." It seems very unlike the other Framework controls, which tend to be much more flexible and robust. Does Microsoft have any plans to improve the RichTextBox with Whidbey? If not, could the Whidbey team please consider this? Many thanks, Robert Jacobson Tag: DataGrid Event Problem Tag: 56285
  - 7
    - Performance concern... Hi, I am deciding whether I should use MFC or C# to write a Management Station which has lots of GUI components I would perfer C# for shorter development time...but I am a bit concerning the performance when there are large number of UI components so my questions is is the application still very responsive if i run a C# program under a P4 1.8 G, 256MRam platform running win2k? how about comparing MFC to C#? thank you Tag: DataGrid Event Problem Tag: 56284
  - 8
    - Disallow New Row Addition in Datagrid (Visual Basic.Net Data Grid) Hello Everybody, I am using Datagrid in VB.net. I don't want the auto generation of rows in the datagrid (last row shouldnt be the new row with empty values)..in addition to this the datagrid should not be readonly..that is I should be allowed to edit the values in datagrid. You help will be appreciated. Thanks. Best, Shivang. Tag: DataGrid Event Problem Tag: 56282
  - 9
    - Overlapping panels Hi, I have a form. On the form's client area I place a panel control.The form is panel's parent. I create buttons and place them on the panel. The panel is parent of the buttons. I create second panel and place it on the first panel. The problem is that the buttons of the first panel are visible and operative, popping through the second panel. I can hide the buttons programatically but shouldn't they disappear by themselves after a new control is placed on them (or their parent)? Thanks, joe Tag: DataGrid Event Problem Tag: 56278
  - 10
    - Msgbox Appearing BEHIND application Form We have a weird problem, where we are popping up a msgbox, and intermittently it is displaying BEHIND the main app form. Basically, our form is up, we call a simple msgbox, and 97 times out of 100 it pops up exactly right. 3 times out of 100 it pops up behind the app. It panics the user, as they can no longer click on the app. They must minimize the app, click on the dialog, then restore the app. We have tried "MsgBoxStyle.MsgBoxSetForeground" and "MsgBoxStyle.ApplicationModal" to no avail... VS2002, WinXP Any ideas for workarounds or troubleshooting this one? Thanks! Tag: DataGrid Event Problem Tag: 56275
  - 11
    - Troubleshoot Possible Memory/Slowdown Problems We have rolled out an app, and are experiencing complete application and system slowdown as users open and close windows forms in our app throughout the day. It usually happens about 50 or so form opening/closing cycles. If the user notices the app is slowing down, and they exit the app then go back in, it works fine for another 50 or so open/closes. If they keep pushing it, and go another 20-30 times, it will eventually be so slow the form takes 2-3 minutes to redraw, and will eventually lock their PC, forcing a reboot. The forms do have quite a few controls on them. They do talk to a database, but not using bound forms, and the data access is pretty small. We have tried setting all objects to nothing at the end of all procedures, doing GC.Collect, other things, but can't quite nail it down... The client machines are all WinXP SP1, P4 2.XGhz, 512MB RAM or better. Version 1.0 of the framework, VS2002. Any ideas on troubleshooting this? Is there a specific memory counter somewhere I can monitor or display on the form, so I can see if it goes down? The task manager memory for the app grows and grows, but I understand that may not be a real accurate gauge of memory usage. Thanks! Tag: DataGrid Event Problem Tag: 56274
  - 12
    - Moving a control on form with mouse event? 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 Tag: DataGrid Event Problem Tag: 56273
  - 13
    - 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: DataGrid Event Problem Tag: 56272
  - 14
    - 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: DataGrid Event Problem Tag: 56267
  - 15
    - Buttons on grid Hi How can I place a push button on each row of a grid? Thanks Regards Tag: DataGrid Event Problem Tag: 56261
  - 16
    - Book Help Can someone recommend a book on C# WinForms? Tag: DataGrid Event Problem Tag: 56260
  - 17
    - 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: DataGrid Event Problem Tag: 56259
  - 18
    - 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: DataGrid Event Problem Tag: 56255
  - 19
    - 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: DataGrid Event Problem Tag: 56253
  - 20
    - 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: DataGrid Event Problem Tag: 56251
  - 21
    - 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: DataGrid Event Problem Tag: 56248
  - 22
    - Suggestion What suggestions for C# WinForm books? Tag: DataGrid Event Problem Tag: 56247
  - 23
    - 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: DataGrid Event Problem Tag: 56243
  - 24
    - 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: DataGrid Event Problem Tag: 56241
  - 25
    - 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: DataGrid Event Problem Tag: 56240
- Next
  - 1
    - 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: DataGrid Event Problem Tag: 56239
  - 2
    - 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: DataGrid Event Problem Tag: 56235
  - 3
    - 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: DataGrid Event Problem Tag: 56232
  - 4
    - 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: DataGrid Event Problem Tag: 56230
  - 5
    - .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: DataGrid Event Problem Tag: 56229
  - 6
    - 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: DataGrid Event Problem Tag: 56227
  - 7
    - 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: DataGrid Event Problem Tag: 56226
  - 8
    - 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: DataGrid Event Problem Tag: 56225
  - 9
    - 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: DataGrid Event Problem Tag: 56224
  - 10
    - 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: DataGrid Event Problem Tag: 56216
  - 11
    - How to Remove or Hide a row in datagrid? How I can remove or hide a row datagrid without removing from database ? Tag: DataGrid Event Problem Tag: 56214
  - 12
    - MyMainMenu - Urgent Please correct your system date/time. -- Herfried K. Wagner MVP · VB Classic, VB.NET http://www.mvps.org/dotnet Tag: DataGrid Event Problem Tag: 56210
  - 13
    - 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: DataGrid Event Problem Tag: 56208
  - 14
    - 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: DataGrid Event Problem Tag: 56207
  - 15
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with WinForm + DataGrid

How do I Catch the event if the text have changed in a specific cell ?

Please Help!!!

DataGrid Event Problem by David

David
Wed Sep 10 10:37:37 CDT 2003

>-----Original Message-----
>with WinForm + DataGrid
>
>How do I Catch the event if the text have changed in a
specific cell ?
>
>Please Help!!!
>
>
>.
>

Hi Mario,

I'm not a DataGrid expert (hence my own question further
up!) but the chap who put this page together seems to be...

http://www.syncfusion.com/FAQ/Winforms/

Go to the 'DataGrid' section where there's loads of useful
examples and how to's. One that looks like it might help
you is...

"5.80 How can I detect when a cell starts being edited,
not when it becomes current? "

There's also a downloadable code sample there.

Hope this is of some help,

Cheers,

David Millington.

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Re: DataGrid Event Problem by Ulrich

Ulrich
Wed Sep 10 11:41:28 CDT 2003

Hi Mario,

the column hosts a textbox for editing the cell, and the textbox is accessible from "outside". Just hook your eventhandler in the
DatagridColumnstyle.Textbox.TextChanged event. You will have to check the grid's current row index to identify a specific cell.

Hth, Ulrich

"mario" <MSimard@paradox.ca> schrieb im Newsbeitrag news:uyeGQG5dDHA.2112@TK2MSFTNGP10.phx.gbl...
> with WinForm + DataGrid
>
> How do I Catch the event if the text have changed in a specific cell ?
>
> Please Help!!!
>
>

Top