Image verification code, which can be numbers, English characters, and Chinese characters. Source Code download is provided.

The function is to generate an image and save the text in the image to the session. The source code is downloaded.

Create An ASPX file to provide the verification code image. For example, validcode. aspx, add this event to pageload.
 

C # Code

1. Protected VoidPage_load (ObjectSender, eventargs E)
2. {
3. Session ["Validcode"] = Socansoft. validcode. createimage (4, socansoft. validcode. validtype. Numeric );
4. }

This page is the page that provides the image source. to test it, the front-end html
 

XML/html code

2. <ASP: Image ID="Image1" Runat="Server" Imageurl="/Webbbs/validcode. aspx" />
4. <ASP: textbox ID="Textbox1" Runat="Server"></ASP: textbox>
6. <ASP: button ID="Button1" Runat="Server" Onclick="Button#click" Text="Button" /></Div>

Background code
 

C # code

1. Protected void button#click (Object sender, eventargs E)
2. {