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How to create UDF in Excel using C# and Visual Studio 2008

I found a bug in blsdeltaPut function.
"return Math.Exp(-Yield * Time)* CND(d1)-1;"
this should be
"return Math.Exp(-Yield * Time)* (CND(d1)-1);"
"return -Math.Exp(-Yield * Time)* CND(-d1);".