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This is one of those “D’oh!” moments.  You’re creating your own UITypeEditor.  You know the UITypeEditor class is located in the System.Drawing.Design namespace.  So naturally you want to add to your Visual Studio project a reference to the System.Drawing.Design.dll, right?  Wrong!  When you compile your project, the following error may appear: The type or namespace name Related posts: Adding Assemblies to the Visual Studio "Add Reference" Dialog Web Service Stumper: “Ambiguous Type” IEventHandlerService Already Exists in the Service Container

The .NET FolderBrowserDialog class does not have an InitialDirectory property like the OpenFileDialog class.  But fortunately, it’s quite easy to set an initial folder in the FolderBrowserDialog: FolderBrowserDialog dialog = new FolderBrowserDialog(); dialog.RootFolder = Environment.SpecialFolder.Desktop; dialog.SelectedPath = @"C:Program Files"; if (dialog.ShowDialog() == DialogResult.OK) { Console.WriteLine( dialog.SelectedPath ); } Note that you can choose other RootFolder’s like MyComputer and MyDocuments.  Related posts: Adding Assemblies to the Visual Studio "Add Reference" Dialog Console Output from a WinForms Application The Proper Way to Show the Wait Cursor

If you encounter this warning while compiling a Windows Form application in Visual Studio: The service System.Windows.Forms.Design.IEventHandlerService already exists in the service container. Parameter name: serviceType The solution is not very obvious, and the help provides no guidance.  After a little experimenting, I discovered an easy solution: Exit Visual Studio. Open Explorer, and navigate to the folder Related posts: Visual Studio 2008 and .NET 3.5 Service Pack 1 Released Adding Assemblies to the Visual Studio "Add Reference" Dialog Web Service Stumper: “Ambiguous Type”