How to update few modified records in dataset table data into database table

public int Update(DataSet ds)
        {
            try
            {
                SqlConnection cnn = new SqlConnection("Connection string here");
                SqlDataAdapter da = new SqlDataAdapter("Select command here", cnn);
                SqlCommandBuilder cmdBuilder = new SqlCommandBuilder(da);

                cnn.Open();
                da.Update(ds);
            }
            catch
            {
                return -1;
            }
            finally
            {
                if(cnn!=null && cnn.State == ConnectionState.Open){
                    cnn.Close();
                }
            }

            return 1;
        }