一个控件例子

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Web;
 5 using System.Web.UI;
 6 using System.Web.UI.WebControls;
 7 
 8 public partial class UserControls : System.Web.UI.Page
 9 {
10     protected void Page_Load(object sender, EventArgs e)
11     {
12         if (!this.IsPostBack) {
13            this.txtCount.Text = "1";
14         }
15     }
16     protected void btnAdd_Click(object sender, EventArgs e)
17     {
18         this.txtCount.Text = (Convert.ToInt32(txtCount.Text) + 1).ToString();
19     }
20     protected void btnMinus_Click(object sender, EventArgs e)
21     {
22         this.txtCount.Text = (Convert.ToInt32(txtCount.Text) - 1).ToString();
23     }
24 }