Simple creation of asp.net verification code and asp.net Verification Code

Simple creation of asp.net verification code and asp.net Verification Code

In fact, there are a lot of articles on the creation of the asp.net verification code, but I want to continue to share with you today. You can combine several examples to compile ASP for your website. NET verification code, which is about two parts:

First create an asp.net form ValidateCode. aspx; Do not write anything. Directly write the following code in the backend ValidateCode. aspx. cs:

Protected void Page_Load (object sender, EventArgs e) {string validateCode = CreateValidateCode (); // generate the verification code Bitmap bitmap = new Bitmap (imgWidth, imgHeight ); // generate Bitmap image DisturbBitmap (bitmap); // image background DrewValidateCode (bitmap, validateCode); // draw the verification code image bitmap. save (Response. outputStream, ImageFormat. gif); // Save the image and wait for the output} private int codeLen = 4; // verification code length private int fineness = 85; // image definition private int imgWidth = 48; // Image Width private int imgHeight = 24; // Image Height private string fontFamily = "Times New Roman"; // font name private int fontSize = 14; // font size // private int fontStyle = 0; // Font Style private int posX = 0; // draw the starting coordinate X private int posY = 0; // draw Y private string CreateValidateCode () // generate verification code {string validateCode = ""; Random random = new Random (); // Random number object for (int I = 0; I <codeLen; I ++) // cyclically generate each value {int n = random. next (10 ); // Number validateCode + = n. ToString ();} Session ["vcode"] = validateCode; // Save the verification code. This Session is called at the front end. Return validateCode; // return verification code} private void DisturbBitmap (Bitmap bitmap) // image background {Random random = new Random (); // generate for (int I = 0; I <bitmap. width; I ++) // generate {for (int j = 0; j <bitmap. height; j ++) {if (random. next (90) <= this. fineness) bitmap. setPixel (I, j, Color. lightGray) ;}} private void DrewValidateCode (Bitmap bitmap, string validateCode) // draw the verification code image {Graphics g = Graphics. fromImage (bitmap); // obtain the Paster object Font font = new Font (fontFamily, fontSize, FontStyle. bold); // set the drawing font g. drawString (validateCode, font, Brushes. black, posX, posY); // draw Verification Code image}

The following functions are implemented on the Login. aspx form page:

Login. aspx form Foreground:

// This function is in the click Verification Code picture will replace the verification code // you can use Microsoft built-in jqury. js under the jquery-1.4.1.min.js version above. You can also download it from the official jquery website. <Script src = "styles/jquery-1.4.1.min.js" type = "text/javascript"> </script> function f_refreshtype () {var Image1 = document. getelementbyidx_x_x ("img"); if (Image1! = Null) {Image1.src = Image1.src + "? ";}}---  // call a function to change the verification code

Background code: click "Log on" to verify that the user is entered correctly.

  string usercode = txtcode.Text.Trim();      if (usercode == Session["vcode"].ToString())//Session["vcode"]      {  }

Other codes are the same as others.

The above is the process of generating an ASP. NET verification code, which we will share with you.