private void txtTel_KeyPress(object sender, KeyPressEventArgs e)
        {
            Genel gnl = new Genel();

            gnl.SadeceRakamVeSilme(e);
        }
        private void txtYemekUcret_KeyPress(object sender, KeyPressEventArgs e)
        {
            Genel gnl = new Genel();

            gnl.SadeceRakamVirgulVeSilme(e);
        }
        private void txtOncekiBorcu_KeyPress(object sender, KeyPressEventArgs e)
        {
            Genel gnl = new Genel();

            gnl.SadeceRakamVirgulVeSilme(e);
        }