Richard,

Did you try:

dr["MatchedTo"] = dv[0]["UniqueID"];

That should be all you need to do.

~~Bonnie




>Found it. It was the filter for the DataView. I needed to convert the Guid to a System.String to test for null.
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>>I keep getting an EvaluationException that says : Cannot perform '=' operation on System.Guid and System.Int32.
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>>The exception is at this line:
>>

>>dr["MatchedTo"] = (System.Guid)dv[0]["UniqueID"];
>>

>>
>>dr is a datarow and MatchedTo is defined as a System.Guid in a DataSet. dv is defined as a Dataview and UniqueID is also defined as a System.Guid. dr["MatchedTo"] is DBNull and dv[0]["UniqueID"] contains a Guid. Another note is looking in the locals it looks like dr["MatchedTo"] IS assigned the Guid.
>>
>>Any ideas?
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>>Thanks
>>
>>Richard