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ModelState has an extra key which is empty ?

Posted By:      Posted Date: September 11, 2010    Points: 0   Category :ASP.Net
Hi everybody, I created a Model to do registration on my Website, and add some validations to it. When the user inputs a data, the data will be checked for validity using ModelState.IsValid. But when I input a correct data, it always be invalid. So I decided to debug my program and found that there are an extra key in my ModelState.For my model, I have UserName, Email, Password, ConfirmPassword, SecretQuestion and SecretAnswer (6 elements)But when I debug, in ModelState, I found 7 elements, they are UserName, Email, Password, ConfirmPassword, SecretQuestion SecretAnswer and the last one is "".I don't know why there is an extra "" in my ModelState, and I checked that it was the source of my error. Does anybody know why it appears and how to fix it ?Below I enclose my source to make it clearer [PropertiesMustMatch("Password", "ConfirmPassword", ErrorMessage = "The password and confirmation password do not match.")] [PropertiesMustNotMatch("UserName", "Password", ErrorMessage = "The username must not be the same as password.")] [PropertiesMustNotMatch("SecretQuestion", "SecretAnswer", ErrorMessage = "Secret question must not be the same with secret answer.")] public class RegisterModel { [Required] [DisplayName("User name&quo

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