C# (CSharp) Text2.Focus示例

        private void Text2_KeyPress(System.Object _sender, System.Windows.Forms.KeyPressEventArgs _e1)
        {
            int KeyAscii = (short)(_e1.KeyChar);

            if (!((KeyAscii >= (short)("0"[0]) && KeyAscii <= (short)("9"[0]) || KeyAscii == Keys.Back || KeyAscii == Keys.KeyDelete || KeyAscii == Keys.Space || KeyAscii == Keys.Return)))
            {
                MessageBox.Show("Maaf Hanya Boleh Diisi Angka Saja", "Perhatian", MessageBoxButtons.OK, MessageBoxIcon.Information);
                KeyAscii = 0;
                Text2.Focus();
            }
        }