This sample will demo you how to create an image verification code in ASP.NET. Sometimes we may need the verification code in order to prevent malicious actions. Such as: auto registration by “Automatic-Teller Registration Machine” or the malicious password cracking. We provide a program to acquire a specified number of characters or symbols, and add some interferences with the line, and then output a picture and save the value in session. The user input content according to the display contents of the picture, and then to compare the input with the value in SESSION. According to the results of the comparison, we will determine the follow-up operations.
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