Asp.net C# Tutorial 19 - Create Captcha in ASP.NET C#
[email protected] Chirag's Asp.net C# Tutorial https://www.chirags.in
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Create Captcha in ASP.NET C# *
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<asp:Image ID="captchaImage" runat="server" Height="40px" Width="150px" ImageUrl="~/MyCaptcha.aspx" />
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
public partial class MyCaptcha : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
Random random = new Random();
Bitmap bitmap = new Bitmap(150, 90);
Graphics graphics = Graphics.FromImage(bitmap);
graphics.Clear(Color.White);
graphics.DrawLine(Pens.Black, random.Next(0, 50), random.Next(10, 30), random.Next(0, 200), random.Next(0, 50));
graphics.DrawRectangle(Pens.Blue, random.Next(0, 20), random.Next(0, 20), random.Next(50, 80), random.Next(0, 20));
graphics.DrawLine(Pens.Blue, random.Next(0, 20), random.Next(10, 50), random.Next(100, 200), random.Next(0, 80));
Brush disignBrush = default(Brush);
//captcha background style
HatchStyle[] bkgStyle = new HatchStyle[]
{
HatchStyle.BackwardDiagonal, HatchStyle.Cross, HatchStyle.DashedDownwardDiagonal, HatchStyle.DashedHorizontal, HatchStyle.DashedUpwardDiagonal, HatchStyle.DashedVertical,
HatchStyle.DiagonalBrick, HatchStyle.DiagonalCross, HatchStyle.Divot, HatchStyle.DottedDiamond, HatchStyle.DottedGrid, HatchStyle.ForwardDiagonal, HatchStyle.Horizontal,
HatchStyle.HorizontalBrick, HatchStyle.LargeCheckerBoard, HatchStyle.LargeConfetti, HatchStyle.LargeGrid, HatchStyle.LightDownwardDiagonal, HatchStyle.LightHorizontal
};
//create captcha rectangular area for ui
RectangleF rectagleArea = new RectangleF(0, 0, 250, 250);
disignBrush = new HatchBrush(bkgStyle[random.Next(bkgStyle.Length - 3)], Color.FromArgb((random.Next(100, 255)), (random.Next(100, 255)), (random.Next(100, 255))), Color.White);
graphics.FillRectangle(disignBrush, rectagleArea);
//generate captcha code with random code
string captchaCode = string.Format("{0:X}", random.Next(1000000, 9999999));
//add catcha code into session for use
Session["sessionCaptcha"] = captchaCode.ToLower();
Font objFont = new Font("Times New Roman", 25, FontStyle.Bold);
//create image for captcha
graphics.DrawString(captchaCode, objFont, Brushes.Black, 20, 20);
//Save the image
bitmap.Save(Response.OutputStream, ImageFormat.Gif);
}
}
Note : Flow the Process shown in video.
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Tutorial Link :
https://www.chirags.in/asp-dot-net-c-...
Thanks & Regards,
Chitt Ranjan Mahto "Chirag"
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Watch video Asp.net C# Tutorial 19 - Create Captcha in ASP.NET C# online without registration, duration hours minute second in high quality. This video was added by user Chirags Tutorial 11 June 2022, don't forget to share it with your friends and acquaintances, it has been viewed on our site 957 once and liked it 7 people.