当前文件路径：AllInOneValidCode/view.aspx.cs

		            
 1using System;
 2using System.Data;
 3using System.Configuration;
 4using System.Collections;
 5using System.Web;
 6using System.Web.Security;
 7using System.Web.UI;
 8using System.Web.UI.WebControls;
 9using System.Web.UI.WebControls.WebParts;
10using System.Web.UI.HtmlControls;
11
12public partial class view : System.Web.UI.Page
13...{
14    protected void Page_Load(object sender, EventArgs e)
15    ...{
16
17    }
18    protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
19    ...{
20        switch (DropDownList1.SelectedValue)
21        ...{
22            case "1":
23                Image1.ImageUrl = "png.aspx?aa=1";
24                break;
25            case "2":
26                Image1.ImageUrl = "png.aspx?aa=2";
27                break;
28            case "3":
29                Image1.ImageUrl = "png.aspx?aa=3";
30                break;
31        }
32    }
33    protected void Button2_Click(object sender, EventArgs e)
34    ...{
35        if (TextBox1.Text == Session["gif"].ToString())
36            Response.Write("OK,正确");
37        else
38            Response.Write("验证码不符合");
39    }
40}