troubleshooting Question

getting an error when switching between programs and when running exe

Avatar of apuma
apumaFlag for United States of America asked on
Visual Basic.NET
18 Comments1 Solution220 ViewsLast Modified:
hello experts whenever i switch to another program window then return to the project i get this error
or if i try to execute the .exe file  

An unhandled exception of type 'System.NullReferenceException' occurred in system.windows.forms.dll

Additional information: Object reference not set to an instance of an object.

the debugger then points to the first line

Public Class Form1

of my project.

i doublechecked that form1 is set as the default form    

any ideas on what could cause this?  
thanks in advance
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