Running 2 DataSets; Running into Problems

I added one DataSet to my project, and am now able to use a DropDown to query a GridView.  That was working great!  Now, I just added a second DataSet to my project, and the whole thing blows up!  I followed the same steps, for the second, as for the first, and this killed me project.  The only difference was that I had a slightly different name for the Fill a DataTable, MethodName and Return a DataTable, MethodName.
I undid the second DataSet and it works again (with one DataSet).  How can I use a second DataSet for a second DropDown and a second GridView?
 
Thanks,
Ryan---
 
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