check.ascx.cs

验证码控件,附属性就可以运行,不错的一个工具,试试看.

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class check : System.Web.UI.UserControl
{

    public string Number
    {
        get
        {
            return (string)ViewState["Number"];
        }
        set
        {
            ViewState["Number"] = value;
        }
    }
    protected void Page_Load(object sender, EventArgs e)
    {
        if(!IsPostBack)
            init();
    }
    public string init()
    {
        string temp = "";
        show.InnerHtml = "";
        if (true)
        {
            Random ran = new Random(System.DateTime.Now.Millisecond+1);
            int r = ran.Next(0, 9);
            temp += r.ToString();
            show.InnerHtml += "<img src='number/"+r.ToString()+".gif'/>";
        }
        if (true)
        {
            Random ran = new Random(System.DateTime.Now.Millisecond + 2);
            int r = ran.Next(0, 9);
            temp += r.ToString();
            show.InnerHtml += "<img src='number/" + r.ToString() + ".gif'/>";
        }
        if (true)
        {
            Random ran = new Random(System.DateTime.Now.Millisecond + 3);
            int r = ran.Next(0, 9);
            temp += r.ToString();
            show.InnerHtml += "<img src='number/" + r.ToString() + ".gif'/>";
        }
        if (true)
        {
            Random ran = new Random(System.DateTime.Now.Millisecond + 4);
            int r = ran.Next(0, 9);
            temp += r.ToString();
            show.InnerHtml += "<img src='number/" + r.ToString() + ".gif'/>";
        }
        Number = temp;
        return temp;
    }
}