Max Windows Controls

[Dylan van Heerden]

Hi all I was wondering if there's any limit to the windows controls? I recieve the following error "Error creating window handle." while trying to databind a treeview to textbox. Thanks ppl

[Heath Stewart]

Yes there is a limit to the number of handles in Windows and Windows NT, the former being much lower but still impractical to ever reach. This is most likely not your problem. The problem is, most likely, that a TextBox is not a container control. The use of "databind" is also not possible in this context, since neither represents data. Please post relevent code so that we can help you diagnose the problem you're having, since the discription you've given doesn't have nearly enough information to form any decent diagnosis. This posting is provided "AS IS" with no warranties, and confers no rights. Software Design Engineer Developer Division Sustained Engineering Microsoft [My Articles] [My Blog]

[Dylan van Heerden]

Ok here's the code where it happens This works fine "this.textBox_ClsId.DataBindings.Add(new Binding("Text", ((DataSource)this.treeView_WorkView.SelectedNode.Tag), "Datamember")); this.textBox_ClsIdentifier.DataBindings.Add(new Binding("Text", ((DataSource)this.treeView_WorkView.SelectedNode.Tag), "Datamember")); this.textBox_ClsDescription.DataBindings.Add(new Binding("Text", ((DataSource)this.treeView_WorkView.SelectedNode.Tag), "Datamember")); this.textBox_ClsVersion.DataBindings.Add(new Binding("Text", ((DataSource)this.treeView_WorkView.SelectedNode.Tag), "Datamember"));" This is the only line giving me the error "//this.textBox_ClsExtends.DataBindings.Add(new Binding("Text", ((DataSource)this.treeView_WorkView.SelectedNode.Tag), "Datamember"));" This is also working fine "this.checkBox_ClsAbstract.DataBindings.Add(new Binding("Checked", ((DataSource)this.treeView_WorkView.SelectedNode.Tag), "Datamember")); this.checkBox_ClsNew.DataBindings.Add(new Binding("Checked", ((DataSource)this.treeView_WorkView.SelectedNode.Tag), "Datamember")); this.checkBox_ClsSealed.DataBindings.Add(new Binding("Checked", ((DataSource)this.treeView_WorkView.SelectedNode.Tag), "Datamember"));" thanks

[Heath Stewart]

What's a DataSource, and what's the "Datamember"? Please don't post pseudo-code since it typically doesn't show the error. If DataSource is actually a class you created then please explain it, otherwise please use the actual class. For "Datamember" it's not so much important, but specifying such information should not be any sort of breach. If someone wanted to see your code, they'd just have to disassemble or decompile it with a slew of tools already available, including ildasm.exe that ships with the .NET Framework SDK. If DataSource is a class besides a DataSet, DataTable, DataView, or DataViewManager derivative, then you're using property bindings. What type is the property that is returned from whatever "Datamember" represents in that line? If it is a data or data-derived class from those listed above, what type of data does the column represented by "Datamember" in that line represent, and is it returning DBNull (or null, if a strongly typed DataSet)? This posting is provided "AS IS" with no warranties, and confers no rights. Software Design Engineer Developer Division Sustained Engineering Microsoft [My Articles] [My Blog]

[Dylan van Heerden]

I apologize for not providing the correct information. The datasource is a class and the class name is "Class" and the datamember is "Extends". I found out that the datamember "Extends" was not assigned. Again I apologize but I'd like to say thank you for the help. Thanks