public static DataTable DistinctSomeColumn(DataTable sourceTable, params string[] fieldName)

        {

            DataTable dt2 = sourceTable.Clone();

            DataView v1 = dt2.DefaultView;

            StringBuilder filter = new StringBuilder();

            foreach (DataRow row in sourceTable.Rows)

            {

                for (int i = 0; i < fieldName.Length; i++)

                {

                    filter.AppendFormat("{0}='{1}'", fieldName[i], row[fieldName[i]].ToString().TrimEnd());

                    if (i < fieldName.Length - 1)

                    {

                        filter.Append(" and ");

                    }

                }

                v1.RowFilter = filter.ToString();

                if (v1.Count > 0)

                {

                    filter = new StringBuilder();

                    continue;

                }

                dt2.Rows.Add(row.ItemArray);

                filter = new StringBuilder();

            }

            return dt2;

        }