private void Form1_Load(object sender, EventArgs e)
{
  label1.Text = "Enter a";
  label2.Text = "Enter b";
  label3.Text = "Enter password";
  label4.ResetText();
  label1.AutoSize = true;
  label2.AutoSize = true;
  label3.AutoSize = true;
  label4.AutoSize = true;
  textBox3.PasswordChar = '*';
}
