private void button15_Click(object sender, EventArgs e)
{
Form20 s = new Form20();
s.Show();
this.Hide();
}
private void button4_Click(object sender, EventArgs e)
{
conn.Open();
string query = "insert into login(username,password) values ('" + textBox1.Text + "','" + textBox2.Text + "')";
MySqlDataAdapter sda = new MySqlDataAdapter(query, conn);
sda.SelectCommand.ExecuteNonQuery();
conn.Close();
MessageBox.Show("Type successfully added");
Form20 s = new Form20();
s.Show();
this.Hide();
}