I've created a custom control which I am trying to add into an aspx page but I keep getting the following message even though as far as I can see I've got a reference to Systems.windows.forms<BR><BR>BC30007: Reference required to assembly 'System.Windows.Forms' containing the base class 'System.Windows.Forms.UserControl'. Add one to your project<BR><BR>Any ideas ?
BC30007: Reference required to assembly
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