How to retrieve the database value in c# windows application

dataGridView1.Columns[16].DataPropertyName = "Tumble";

dataGridView1.Columns[17].DataPropertyName = "Shearing";

dataGridView1.Columns[18].DataPropertyName = "Raising";

dataGridView1.Columns[19].DataPropertyName = "Stenter";

private void displaydata()

{

dt3 = new DataTable();

SqlDataAdapter da3= new SqlDataAdapter("selectJob_No,Customer,PO_No,O_No,Fabric,Blend,Colour,GSM,F_Width,Order_Qty,Split_Qty,Dye_Qty,Knitting,Heat_Set,Dyeing,Dryer,Tumble,Shearing,Raising,Stenter from Finishing_Production WHERE V_No='" + textBox1.Text + "' GROUP BY Job_No,Customer,PO_No,O_No,Fabric,Blend,Colour,GSM,F_Width,Order_Qty,Split_Qty,Dye_Qty,Knitting,Heat_Set,Dyeing,Dryer,Tumble,Shearing,Raising,Stenter", con1);

da3.Fill(dt3);

dataGridView1.DataSource = dt3;

}