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This error is occuring while adding one datatable from a dataset to another
.”DataTable already belongs to another DataSet.”
dsformulaValues.Tables.Add(m_DataAccess.GetFormulaValues
(dv.ToTable.DefaultView.ToTable(False, strSelectedCols)).Tables(0))
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.
The copied DataTable will have the structure and data of the copied DataTable.
If you only want the structure of the DataTable, call Clone instead.