อยากทราบ ดับเบิ้ลคลิกที่ Datagridview แล้วส่งค่าข้ามฟอร์ม มาแสดงใน Textbox (C#.NET)

private void invProductId_DoubleClick(object sender, EventArgs e)
        {
            if (invProductId.ReadOnly == false)
            {
                ProductView pv = new ProductView();
                pv.Show();
            }
        }

private void Form1_Load(object sender, EventArgs e)
        {
            OleDbConnection myConnection = default(OleDbConnection);
            DataTable dt = new DataTable();
            OleDbDataAdapter Adapter = default(OleDbDataAdapter);
            myConnection = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0; Data Source=SparesStore.mdb;");
            myConnection.Open();
            OleDbCommand myCommand = myConnection.CreateCommand();
            myCommand.CommandText = "SELECT * FROM Product";
            myCommand.CommandType = CommandType.Text;

            Adapter = new OleDbDataAdapter(myCommand);
            Adapter.Fill(dt);

            myConnection.Close();

            this.ProductViewList.DataSource = dt;

            this.ProductViewList.Columns.Clear();

            DataGridViewTextBoxColumn column;

            column = new DataGridViewTextBoxColumn();
            column.DataPropertyName = "รหัสสินค้า";
            column.HeaderText = "รหัสสินค้า";
            column.Width = 180;
            this.ProductViewList.Columns.Add(column);

            column = new DataGridViewTextBoxColumn();
            column.DataPropertyName = "ชื่อสินค้า";
            column.HeaderText = "ชื่อสินค้า";
            column.Width = 250;
            this.ProductViewList.Columns.Add(column);

            column = new DataGridViewTextBoxColumn();
            column.DataPropertyName = "หน่วยนับ";
            column.HeaderText = "หน่วยนับ";
            column.Width = 80;
            this.ProductViewList.Columns.Add(column);

            column = new DataGridViewTextBoxColumn();
            column.DataPropertyName = "VIP";
            column.HeaderText = "VIP";
            column.Width = 60;
            this.ProductViewList.Columns.Add(column);

            column = new DataGridViewTextBoxColumn();
            column.DataPropertyName = "ประจำ";
            column.HeaderText = "ประจำ";
            column.Width = 60;
            this.ProductViewList.Columns.Add(column);

            column = new DataGridViewTextBoxColumn();
            column.DataPropertyName = "ทั่วไป";
            column.HeaderText = "ทั่วไป";
            column.Width = 60;
            this.ProductViewList.Columns.Add(column);

            dt = null;
        }

        //public string temp { get; set; }

        private void ProductViewList_CellMouseDoubleClick(object sender, DataGridViewCellMouseEventArgs e)
        {
            string temp;
            temp = ProductViewList.CurrentRow.Cells[0].Value.ToString();

            SalesOrder so = new SalesOrder();
            so.invProductId.Text = temp;

            this.Close();
        }

private void dataGridView1_CellClick_1(object sender, DataGridViewCellEventArgs e)
        {
        
            textBox1.Text = dataGridView1.Rows[e.RowIndex].Cells[0].Value.ToString();
            textBox2.Text = dataGridView1.Rows[e.RowIndex].Cells[1].Value.ToString();
            textBox3.Text = dataGridView1.Rows[e.RowIndex].Cells[2].Value.ToString();
            textBox4.Text = dataGridView1.Rows[e.RowIndex].Cells[3].Value.ToString();
            textBox5.Text = dataGridView1.Rows[e.RowIndex].Cells[4].Value.ToString();
            textBox6.Text = dataGridView1.Rows[e.RowIndex].Cells[5].Value.ToString();

        }