Changing Bitmap on BaseCommands/Tools at runtime

A common scenario that ArcObjects developers come across is creating a button or tool in ArcMap whose image changes when clicked.

Example: Say you wish to create a “LogOn” button whose bitmap needs to change to “LogOff” bitmap once the user has logged in.

Just setting base.m_bitmap to the new bitmap does not update the bitmap in ArcMap. Instead you need to use the BaseCommand.UpdateBitmap method.

Per ESRI .Net documentation:
UpdateBitmap changes the Bitmap for the command. Call this method to update the icon used for the command at runtime, after the command has already been instantiated.

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