Vista - RenderTargetBitmap Issues

Hello All,

Iam using RenderTargetBitmap to snapshot a Grid which has bunch of
VisualBrushes and other UI controls.

I keep getting the Argumentexception "Value does not fall within the
expected range."
It does not break into the debugger at any particular line of code
where I am using the RenderTargetBitmap .

My question is there any other way by which I keep snapshot a visual in
WPF other than using RenderTarget Bitmap?

I see lot of perf issues as well, when the particular bitmap is out of
scope it doesnot appear to be Garbage collecting them as the Memory
Foot print keeps increasing .

Thanks