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In C# unit testing, can we assign a value to the ComboBox’s SelectedValue without triggering an event

To assign a value to the ComboBox’s SelectedValue without triggering an event during unit testing in C#, follow these steps:

  1. Access the ComboBox’s Underlying Windows HWND:

  2. Use GetWindowHandle() method to retrieve the window handle of the ComboBox.

  3. SendMessage Method with WM_SETTEXT:

  4. Utilize the SendMessage Win32 API function to send a WM_SETTEXT message to the ComboBox’s HWND, specifying the desired text value as LPARAM.

This approach directly sets the ComboBox’s text without invoking any selection change events, allowing you to update the SelectedValue programmatically during testing.

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