private void button12_Click(object sender, EventArgs e)
{
Form21 s = new Form21();
s.Show();
this.Hide();
}
private void button2_Click(object sender, EventArgs e)
{
conn.Open();
string query = "insert into sells (bill_no,name,date,product,price,quantity,total)values('" + textBox6.Text + "','" + textBox1.Text + "','" + dateTimePicker1.Value.ToString() + "','" + textBox2.Text + "','" + textBox3.Text + "','" + textBox4.Text + "','" + textBox5.Text + "')";
MySqlDataAdapter sda = new MySqlDataAdapter(query, conn);
DataTable dt = new DataTable();
sda.Fill(dt);
dataGridView1.DataSource = dt;
Form21 s = new Form21();
s.Show();
this.Hide();
conn.Close();
count_a();
printPreviewDialog1.Document = printDocument1;
printPreviewDialog1.ShowDialog();
}