private void existingKeyToolStripMenuItem_Click(object sender, EventArgs e)
        {
            EncryptExisting enx = new EncryptExisting();

            enx.ShowDialog();
        }
        private void linkLabelEncriptExisting_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
        {
            EncryptExisting enx = new EncryptExisting();

            enx.ShowDialog();
        }