C#對DataGridView中的資料進行添加、修改、刪除操作

private Boolean dbUpdate()
        {
            string strSql = "select ProductsSpecID,ProductsSpec,ProductsSpecUnit,ProductsID from tbl_product_detail_master";
            System.Data.DataTable dtUpdate = new System.Data.DataTable();
            dtUpdate = this.dbconn(strSql);
            dtUpdate.Rows.Clear();

            System.Data.DataTable dtShow = new System.Data.DataTable();
            //dtShow = (DataTable)this.bindSource.DataSource;
            dtShow = (System.Data.DataTable)this.dgselect.DataSource;

            int p1 = dtShow.Rows.Count;
           // try
           // {

                for (int i = 0; i < dtShow.Rows.Count; i++)
                {
                   DataRowState rowState=new DataRowState();
                   rowState=dtShow.Rows[i].RowState;
                   if (rowState==DataRowState.Added || rowState==DataRowState.Detached || rowState==DataRowState.Modified)
                    {

                        if (this.dgselect["Del", i].Value.ToString() == "1")
                        {
                            dtShow.Rows[i].Delete();
                        }
                    }
                }
               
            for (int i = 0; i < dtShow.Rows.Count; i++)
            {
                dtUpdate.ImportRow(dtShow.Rows[i]);
            }
            int num = dtUpdate.Rows.Count;
            try
            {
                this.conn.Open();
               
                trans = this.conn.BeginTransaction();

                MySqlCommandBuilder CommandBuiler;
                CommandBuiler = new MySqlCommandBuilder(this.adapter);

                this.adapter.Update(dtUpdate);
                trans.Commit();
                this.conn.Close();

            }
            catch ( Exception  ex)
            {
                MessageBox.Show(ex.Message.ToString());
                trans.Rollback();
                return false;
            }

            dtUpdate.AcceptChanges();
             return true;

        }