Thanks,

So you are saying execute a ToUpper() on each guid type column in every row before I call the Bulk Copy? I guess that means leave the fox table type as C(36) and not a varbinary.

That could be really slow depending on the number of guid columns times the number of rows in each data table. I was hoping more to know which data type I can leave the fox tables guid columns in and have it move from fox to C# dataset to Sql table without any major hoops. I guess there is none.