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For some time now I have been using extension methods to expand the functionality of already existing classes. An example: <System.Runtime.CompilerServices.Extension()> _ Public Sub DrawRoundedRectangle(graphics As Graphics, pen As Pen, x As Single, y As Single, width As Single, height As Single, radius As Single) graphics.DrawRoundedRectangle(pen, x, y, width, height, radius, RectangleEdgeFilter.All) End Sub This happily extends the graphics object so that I can call: e.graphics.DrawRoundedRectangle() However every so often Visual Studio will report: DrawRoundedRectangle is not a member of System.Drawing.Graphics This means that I am unable to build due to the errors, and as of yet other than restarting Visual Studio (time consuming) I am yet to find a way to overcome these errors. I have numerous extension methods (currently around 10) on various different classes, all of which fall over at the same time, this generates 66 errors. My question is, Is there anything I am missing whilst creating these extension methods, or is there anything that can be done to stop these errors occuring?

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