error in call VF dll

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error in call VF dll

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Hi,

When I used Visual basic.net 2003 to call a VF dll, I got a error message

'System.NullReferenceException' ocurred in system.windows.forms.dll

Additional information:Object reference not set to an instance of an object. I used the sample program from compaq website,it should be correct.Could any expert give me some advice ?

thanks

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