System.Data.Common.DataTableMappingCollection.ValidateSourceTable C# (CSharp) Method

        internal void ValidateSourceTable(int index, string value)
        {
            int pindex = IndexOf(value);
            if ((-1 != pindex) && (index != pindex))
            {
                // must be non-null and unique
                throw ADP.TablesUniqueSourceTable(value);
            }
        }