Basic C # Programming Experiment (8) (4) __ Programming

Design the form. Requirements: Form title is "My text box experiment"; A label on a form; a text box in a text box that can enter only 0~9 10 digits and a maximum of 8 characters. Click the End button to end the program.

The code is as follows:

Using System;
Using System.Collections.Generic;
Using System.ComponentModel;
Using System.Data;

Using System.Drawing;

Using System.Windows.Forms;
            namespace WindowsFormsApplication1 {public partial class Form1:form {public Form1 () {

        InitializeComponent (); } private void Form1_Load (object sender, EventArgs e) {this.
            Text = "My text box experiment"; Button1.
        Text = "End"; } private void Label1_click (object sender, EventArgs e) {Label1.
        Text = "Only 0 to 90 digits can be entered in the textbox below, with a maximum of 8"; } private void Button1_Click (object sender, EventArgs e) {this.
        Close ();  } private void Textbox1_keypress (object sender, KeyPressEventArgs e) {if (E.keychar < ' 0 ') ||
            E.keychar > ' 9 ') {e.handled = true;
        } textbox1.maxlength = 8; } private void textBox1_TextChanged (oBject sender, EventArgs e) {}}}