Cannot Change Value Dialog Box
Error
The value of this variable cannot be changed | The name name does not exist in the current context | various other messages
This message box appears when you try to change the contents of a variable to an illegal value in a debugger window (Autos, Watch, or Locals windows) or in the QuickWatch dialog box. For example, if you try to set the value of an integer variable to a character string, this message box appears.
Solution
Make sure the input you type into the debugger window or QuickWatch dialog box represents a legal value for the variable you are trying to set.