private void button1_Click_1(object sender, EventArgs e)
        {
            encription f = new encription();
            f.ShowDialog();
        }

private void button4_Click(object sender, EventArgs e)
        {
            Close();
        }

private void radioButton1_CheckedChanged(object sender, EventArgs e)
        {
            if (radioButton1.CheckedChanged == true)
            {
                txtplain.Enabled = true;
                txtcipher.Enabled = true;
                btnencripttext.Enabled = true;
                cmbtextkey.Enabled = true;
                txtplainfilename.Enabled = false;
                txtcipherfilename.Enabled = false;
                btnfileencription.Enabled = false;
                cmbfilekey.Enabled = false;
                btnselplainfile.Enabled = false;
                btnselcipherfile.Enabled = false;
            }
        }

private void button2_Click_2(object sender, EventArgs e)
        {
            if (radioButton2.CheckedChanged == true)
            {
                txtplain.Enabled = false;
                txtcipher.Enabled = false;
                btnencripttext.Enabled = false;
                cmbtextkey.Enabled = false;
                txtplainfilename.Enabled = true;
                txtcipherfilename.Enabled = true;
                btnfileencription.Enabled = true;
                cmbfilekey.Enabled = true;
                btnselplainfile.Enabled = true;
                btnselcipherfile.Enabled = true;
            }
        }

private void button3_Click_1(object sender, EventArgs e)
        {
            Application.Exit();
        }

private void button2_Click_2(object sender, EventArgs e)
        {
            dcription f = new dcription();
            f.ShowDialog();
        }