Rendering A Report Using Custom Assembly

I have created a custom assembly and referenced it and the program builds successfully. When I try to run the report in design mode, it will not render, it throws an exception when it tries to create a PDF. When I remove the assembly, the reports work well. So I'm not sure what it is that I'm doing wrong - does anyone have any suggestions?



namespace Calculations

{

public class calcPercentage

{

public static decimal Percentage(decimal decValueOne, decimal decValueTwo)

{

decimal decPercentage = 0;

if (decValueOne == 0 || decValueTwo == 0)

{

decPercentage = 0;

}

else

{

decPercentage = (decValueOne - decValueTwo) / decValueOne;

}

return decPercentage;

}

}

}

Then in my textbox I put:

=Calculations.CalcPercentage.Percentage(SUM(Fields!PreviousYTDExpenseAmount.Value, "Template_OutputData_Sales"), SUM(Fields!PreviousYTDExpenseAmount.Value, "Template_OutputData_CGS"))



I referenced the assembly and added it to C:Program FilesMicrosoft Visual Studio 8Common7IDEPrivateAssemblies and I still get that error message so I do not know what the problem is.



The line where the exception occurs happens here:

byte[] bytes = MyReport.rvOutput.LocalReport.Render("PDF", null, out mimeType, out encoding, out extension, out streamids, out warnings);





Thanks so much for you help! If you have any suggestions about my next error...i'm all ears!