private void button4_Click(object sender, EventArgs e)//找回密码
{
Form3 form3 = new Form3();
form3.Show();
}
private void вычитаниеToolStripMenuItem_Click(object sender, EventArgs e)
{
Form vich = new Form3();
vich.Show();
}
private void лабораторнаяРабота2ToolStripMenuItem_Click(object sender, EventArgs e)
{
Form3 Form3 = new Form3(this);
Form3.Show();
}