system.invalidcastexception

I have converted my program from vb6
In the initializecomponent event the following code give a n exception
CType(Me.controlname, System.ComponentModel.ISupportInitialize).EndInit()
Exception first-chance of type "System.InvalidCastException" in
system.windows.forms.dll

Additional information: Cast not supported.
what's wrong? I am using vsnet2002 with framework 1.0 sp3.
how can i take this exception away

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