Thank you for writing.
All projects that use RadControls for WinForms have the Telerik.WinControls.dll
assembly referenced (it is automatically added once you drag a RadControl from the Toolbox to the form). Then, once you type in RadMessageBox
in the code behind, Visual Studio will suggest you to import the namespace of the RadMessageBox type (if it has not been already imported). However, we will consider adding the full namespace to RadMessageBox documentation.
All the best,
the Telerik team
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