//===================================================================================
private void RSAToolStripMenuItem_Click(object sender, EventArgs e)
{
RSAShifr rSA = new RSAShifr
{
MdiParent = this
};
rSA.Show();
}
private void RSAToolStripMenuItem_Click(object sender, EventArgs e)
{
RSAShifr form3 = new RSAShifr();
form3.Show();
}