How to get DataRow index in a Datatable

public static int Getindex(string row,DataTable dt)
        {
            int id=0;
            string rowvalue = row;
            try
            {
                id = (from DataRow dr in dt.Rows
                      where (string)dr["Description"] == rowvalue
                      select (int)dr["Id"]).FirstOrDefault();
            }
            catch(Exception ex)
            {
                //Response.Write(ex.Message);
            }
            return id;
        }