How To Get More Descriptive Error Messages In SSIS,Programatically?

hi all,
I am developing an application in C# which creates SSIS package programatically.These packages perform various activities like transfering data from one server to another,extract data from table,transfering data from sql to msaccess etc.Here I am using the following code to get the description of the SSIS errorcode.




Code Snippet
Public static String GetErrMesg(IDTSComponentMetaData90 MD,Exception Err)
{
try
{
COMException comEx=Err as COMException;
return MD.GetErrorDescription(comEx.ErrorCode);
}
Catch
{
return Err.Message;
}




For example if the error code is 0xC0204018,the application shows its equivalent description as
"The "%1!s!" has a precision that is not valid. The precision must be between %2!ld! and %3!ld! "


But the actual error message is "The Output column "fund" has a precision that is not valid. The precision must be between 1 and 18"

My question is how to show more descriptive error message..like how to replace "%1!s!" to the actual field.


Please give ur suggestions...