第五种/ValidateCode.aspx.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace 验证码.第五种
{
    public partial class ValidateCode : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            validatedCode v = new validatedCode();
            string code = v.CreateVerifyCode(); //取随机码
            
            v.CreateImageOnPage(code, this.Context); // 输出图片 
            Session["CheckCode"] = code; //Session 取出验证码

        }

        protected void Button1_Click(object sender, EventArgs e)
        {
            string vCode = Session["CheckCode"].ToString(); 
            if (txtValidatedcode.Text.Trim().ToUpper() == vCode.ToUpper()) 
            {
                ScriptManager.RegisterStartupScript(this.Page, this.GetType(), "Startup", "alert('ValidatedCode is right!');", true); 
            }
        }
    }
}