求c#写的带验证码的完整登陆代码

Question

求c#写的带验证码的完整登陆代码！（小弟急需）

Answer 1

http://www.51aspx.com/CV/SiZeYunSuanYanZhengMa/

Answer 2

http://www.51aspx.com/CV/SimpleCheckCode/

Answer 3

验证码在生成页面保存到session 
if (Page.IsValid)
            {
                if (Session["Code"] == null)
                {
                    return;
                }
                if (Session["Code"].ToString().Equals(this.txtnum.Text.Trim()))
                {
                    SysUser user = SysUserBLL.GetModel("");
                    if (user != null)
                    {
                      if (!user.Pwd.Equals(this.txt_password.Text))
                        {
                        }
                        else
                        {
                                                 
                            this.Response.Write("<script language='javascript'>window.open('main.htm','_self')</script>");
                          
                        }
                    }
                    else
                    {                    }
                }            }

Answer 4

你是不会画那个验证码吗？
public class Commom
    {
        //生成随机验证码字符串
        public static string CreateVildateString(int length)
        {
            //设置允许出现的字符
            string chars = "abcdefjhigklmnopqrstuvwxyzABCDEFJHIGKLMNOPQRSTUVWXYZ1234567890";            Random r = new Random(DateTime.Now.Millisecond);
            //随机字符串
            string ValidateString = "";
            for (int i = 0; i < length; i++)
            {
                ValidateString += chars[r.Next(chars.Length)];
            }
            return ValidateString;
            
        }        public static byte[] CreateValidateCode(string validateCode)
        { 
            //设置场景
            Bitmap bmp=new Bitmap(validateCode.Length*12,22);
            //获取绘图对象
            Graphics g = Graphics.FromImage(bmp);
            g.Clear(Color.White);
            //设置字体
            Font f=new Font("Arial",12,FontStyle.Bold|FontStyle.Italic);
            //设置渐变矩形
            Rectangle r=new Rectangle(0,0,bmp.Width,bmp.Height);
            //设置渐变刷子
            LinearGradientBrush b=new LinearGradientBrush(r,Color.Red,Color.Blue,1.2f,true);
            //绘制干扰线
            Random rd = new Random(DateTime.Now.Millisecond);
            Pen pen = new Pen(Color.Silver);
            for (int i = 0; i < 25; i++)
            {
                int StartX = rd.Next(bmp.Width);
                int StartY = rd.Next(bmp.Height);
                int EndX = rd.Next(bmp.Width);
                int EndY = rd.Next(bmp.Height);
                g.DrawLine(pen,StartX,StartY,EndX,EndY);
            }
            //绘制干扰点
            for (int i = 0; i < 100; i++)
            {
                int x = rd.Next(bmp.Width);
                int y = rd.Next(bmp.Height);
                int red = rd.Next(256);
                int green = rd.Next(256);
                int blue = rd.Next(256);
                bmp.SetPixel(x,y,Color.FromArgb(red,green,blue));
            }
            //绘制验证图片
            g.DrawString(validateCode, f, b, 3, 2);            MemoryStream ms = new MemoryStream();
            bmp.Save(ms,ImageFormat.Jpeg);
            bmp.Dispose();
            return ms.ToArray();
        }        public static string Alert(string str)
        {
            return @"<script>alert('" + str + "')</script>";
        }
    }