private void textBox1_KeyPress(object sender, KeyPressEventArgs e)  {            if (!char.IsDigit(e.KeyChar))            {                MessageBox.Show("只能输入数字");                e.Handled = true;//文本框不接受不正确的输入            }  } private void textBox2_KeyPress(object sender, KeyPressEventArgs e){           textBox2.ImeMode = ImeMode.Off;//关闭输入法。只能输入字母了}private void textBox1_KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e){if(e.KeyChar>='0'&&e.KeyChar <='9')e.Handled=false;elsee.Handled=true;}