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using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
namespace CaptchaImage
{
public class _Default : System.Web.UI.Page
{
protected System.Web.UI.WebControls.TextBox CodeNumberTextBox;
protected System.Web.UI.WebControls.Button SubmitButton;
protected System.Web.UI.WebControls.Label MessageLabel;
// For generating random numbers.
private Random random = new Random();
private void Page_Load(object sender, System.EventArgs e)
{
if (!this.IsPostBack)
// Create a random code and store it in the Session object.
this.Session["CaptchaImageText"] = GenerateRandomCode();
else
{
// On a postback, check the user input.
if (this.CodeNumberTextBox.Text == this.Session["CaptchaImageText"].ToString())
{
// Display an informational message.
this.MessageLabel.CssClass = "info";
this.MessageLabel.Text = "Correct!";
}
else
{
// Display an error message.
this.MessageLabel.CssClass = "error";
this.MessageLabel.Text = "ERROR: Incorrect, try again.";
// Clear the input and create a new random code.
this.CodeNumberTextBox.Text = "";
this.Session["CaptchaImageText"] = GenerateRandomCode();
}
}
}
//
// Returns a string of six random digits.
//
private string GenerateRandomCode()
{
string s = "";
for (int i = 0; i < 6; i++)
s = String.Concat(s, this.random.Next(10).ToString());
return s;
}
#region Web Form Designer generated code
override protected void OnInit(EventArgs e)
{
//
// CODEGEN: This call is required by the ASP.NET Web Form Designer.
//
InitializeComponent();
base.OnInit(e);
}
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
this.Load += new System.EventHandler(this.Page_Load);
}
#endregion
}
}
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