| Author: ANIL PANDEY 04 Aug 2008 | Member Level: Diamond | Rating:  Points: 3 |
hi,
please go through the following links..
http://www.codeproject.com/KB/aspnet/CaptchaImage.aspx
http://www.brainjar.com/dotNet/CaptchaImage/
Thanks
Anil Pandey
|
| Author: Madhavan 04 Aug 2008 | Member Level: Gold | Rating: Points: 6 |
hi,
1. Open a new aspx.
2. write the following code.
3. call this aspx page in a image control in ur main page.
Captcha Code:
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;
/// <summary>
/// Captcha Page.
/// </summary>
public partial class CaptchaPage : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
System.Drawing.Bitmap objBmp = new System.Drawing.Bitmap(90, 25);
System.Drawing.Graphics objGraphics = System.Drawing.Graphics.FromImage(objBmp);
objGraphics.Clear(System.Drawing.Color.Green);
objGraphics.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias;
System.Drawing.Font objFont = new System.Drawing.Font("Acoustic Light", 11, System.Drawing.FontStyle.Bold);
string strRandom = "";
string[] strArray = new string[36];
strArray = new string[] { "a", "b", "c" , "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q",
"r", "s", "t", "u", "v", "w", "x", "y", "z", "0", "1", "2", "3", "4", "5", "6", "7", "8", "9"};
Random autoRand = new Random();
int x;
for (x = 0; x < 6; x++)
{
int i = Convert.ToInt32(autoRand.Next(0, 36));
strRandom += strArray[i].ToString();
}
Session.Add("strRandom", strRandom);
objGraphics.DrawString(strRandom, objFont, System.Drawing.Brushes.White, 3, 3);
Response.ContentType = "image/GIF";
objBmp.Save(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Gif);
objFont.Dispose();
objGraphics.Dispose();
objBmp.Dispose();
}
}
Regards,
Madhavan
|