验证码程序

 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;
 using  System.Drawing;
 using  System.Drawing.Drawing2D;
 using  System.Drawing.Imaging;

 public   partial   class  my_ValidateImage : System.Web.UI.Page
 {
    private readonly string ImagePath = "../images/Validator.jpg";
    private static string sValidator = "";
    protected void Page_Load(object sender, EventArgs e)
    {
        if (Request.Params["Validator"] != null)
        {
            sValidator = Request.Params["validator"].ToString();
        }
        Bitmap bitMapImage = new System.Drawing.Bitmap(Server.MapPath(ImagePath));
        Graphics graphicImage = Graphics.FromImage(bitMapImage);
        graphicImage.SmoothingMode = SmoothingMode.AntiAlias;
        graphicImage.DrawString(sValidator, new Font("Arial", 20, FontStyle.Bold), SystemBrushes.WindowText, new Point(0, 0));
        Response.ContentType = "image/jpeg";
        //bitMapImage.sava(Response.OutputStream, ImageFormat.Jpeg);
      bitMapImage.Save(Response.OutputStream, ImageFormat.Jpeg);
        graphicImage.Dispose();
        bitMapImage.Dispose();

    }
}

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  my_Default : System.Web.UI.Page
 {
    static string sValidator = "134";
    private readonly string sValidatorImageUrl = "ValidateImage.aspx?Validator=";

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            Random r = new Random(10);
            sValidator = r.Next().ToString();
            
           // sValidator = GetRandomint();
      //sValidator = "456789";
       //     sValidator = GetRandomint();
         //   sValidator = GetRandomint();
         //   sValidator = Getrandomint();
          // validateimage.ImageUrl = svalidatorImageUrl + svalidator;
         //ValidateImage.ImageUrl = sValidatorImageUrl + sValidator;
         
         ValidateImage.ImageUrl = sValidatorImageUrl + sValidator;
        // ValidateImage.ImageUrl = "../images/index1.jpg";
        }
    }

    private string GetRandomint()
    {
        throw new Exception("The method or operation is not implemented.");
    }

    private string Getrandomint()
    {
        throw new Exception("The method or operation is not implemented.");
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        int a=0;
        if (a < 1)
        {
        //  Response.Write("<script>window.alert('"asdkfkasd"')</script>");
          //  Response.Write("<script>alert("li")</script>");
         return;

        }
        Response.Redirect("~/default.htm");
    }
} 

每次产生的验证码过程，继续处理中。。。。。。。。 

确保产生的验证码介于（10000，999999）之间 

  sValidator = r.Next(100000,999999).ToString();