DataTable already belongs to another DataSet Exception

Exception Occure : DataTable already belongs to another DataSet Exception :-
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Like the other responses point out, the error you're seeing is because the DataTable you're attempting to add to a DataSet is already a part of a different DataSet.

One solution is to Copy the DataTable and assign the copy to the other DataSet.

dataTable dtCopy = datatable1.Copy();
ds.Tables.Add(dtCopy);

Your problem will solve.