Solution Property Pages Dialog Box - Common Properties - Debug Source Files
Do not look for these source files
Enter the names of any files that you do not want the debugger to read. If the debugger finds one of these files in one of the directories specified above, it will ignore it. If the Find Source dialog box comes up while you are debugging and , you click Cancel, the file you were searching for gets added to this list so that the debugger will not continue searching for that file. Remove an entry if you want to debug a particular file again (for instance, in the meantime you have got the proper file version).