SqlCommand cmd6 = new SqlCommand("SELECT * FROM tblinv WHERE invno='" + textBox5.Text + "'",cn);
SqlDataReader sqlReader6 = cmd6.ExecuteReader();
if (sqlReader6.HasRows)
{
DataTable dt = new DataTable();
DataTable dt1 = new DataTable();
dt.Load(sqlReader6);
dt1 = dt.DefaultView.ToTable(true, "ChallanNo", "ProductName", "UoM", "Price", "Qty","Subtotal");
dataGridView2.DataSource = dt1;
}