Validation Using Captcha Code

Posted by Chvrsri under Error and Solution category on | Points: 40 | Views : 3284
These days many WebSites asks us to type a Captcha code for Registration purposes.There are many spams generated these days inorder to stop those the best way is using CAPTCHA CODE.

This code snippet explains how to generate that random string

//Page Initiation is done here

protected void Page_Load(object sender, EventArgs e)
displayLabel.Text=Captcha() ;
//(displayLabel) is the Label ID
//Defining a Method to Generate Random String
public string Captcha()
string allowedChars = "a,b,c,d,e,f,g,h,j,k,m,n,p,q,r,s,t,u,v,w,x,y,z,";
allowedChars += "A,B,C,D,E,F,G,H,J,K,L,M,N,P,Q,R,S,T,U,V,W,X,Y,Z,";
allowedChars += "2,3,4,5,6,7,8,9";
char[] sep = { ',' };
string[] arr = allowedChars.Split(sep);
string passwordString = "";
string temp;
Random rand = new Random();
for (int i = 0; i < 6; i++)
temp = arr[rand.Next(0, arr.Length)];
passwordString += temp;
return passwordString;

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