Categorie: Visual Studio / C#
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Initializing a combobox to a blank value might be harder than you think
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Combobox troubles again today. No matter how hard I tried to have Comboboxes in my dialog form to initially display blank (SelectedIndex = -1), as soon as the dialog was displayed, the combos would always show the first item in the List that populated it. Despite being set to -1 explicitly. It was driving me…
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Keeping a modeless window accessible from a modal (dialog) window
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In a C# WinForms application I was working on, users were effectively working with two more or less independent windows: one they worked in, and another that showed documents and other info they need to do that work. The problem was that when they were in a dialog, for example one to assist in creating…
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Respond to a click on the background of a listview
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I have a list view in a project that i use to show properties for objects in a tree-like hierarchy, much like the windows explorer. When a user clicks an item, its properties are shown. That wasn’t so hard, just handle the Click event. When a user clicks next to an item or in an…
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Jet OleDB 4.0 provider not registered on the local computer
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I have a C# WinForms program that attempts to import some data from Excel into a SQL Server database using the Ole DB provider. Today the import suddenly failed with an error message saying that the Jet Ole DB provider was not registered on the local computer. Well, I was pretty sure that it was.…
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Open a .cs file in code view instead of winforms designer
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This bugged me for a while. It didn’t bug me enough to spend much time looking for it, but every once in a while I would give it a try and then I’d give up again. The problem? When double-clicking a file in the solution explorer, it would open in the windows forms designer. I…
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Select all text in a textbox when the user clicks to focus
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A tiny patch of code can sometimes save your users a lot of time. In a project I was working on, I used a lot of small textboxes to have the user input small numeric values. (Actually the textbox was a part of a kind of self-constructed NumericUpDown, but that’s another story.) Watching a tester…
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WinForms ComboBox does not always fire SelectionChangeCommitted
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Today I ran into the problem that a ComboBox in my project did not always fire the SelectionChangeCommitted event when I expected it to. To be specific, if a user dropped down the list, used the arrow keys to move to an item, and then TABbed to the next control, the new item would be…
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The case of the Visual Studio blank properties window
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I experienced the strangest thing with my installation of Visual Studio 2008 last Friday. In the middle of developing a Windows Forms application, I noticed that the Properties window had stopped working. It was still there, just blank, and so was the dropdown above it where the components usually reside. Update 19-12: This blog post…