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Regular expression for validating web site address

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The first version is used when you make a GET request and the other is used when the form is submitted by the end user.

The second Index() method accepts User Profile as a parameter. The Is Valid property returns false if any of the properties contain invalid values.

However, in this case our model class is an Entity Framework class.

Since the data model class is automatically created for you by the Visual Studio designer it is not recommended to modify the same class file.

In this example you validate the Phone property with a regular expression for US phone numbers.

At this stage, the User Profile Metadata class is just an independent class in your project.

If you don't specify any Error Message, a default error message is displayed.

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If Is Valid returns true, the data is added to the User Profile table and a success view is rendered.

Now that you have some idea about data annotation attributes, let's develop a simple ASP.

NET MVC application that makes use of these attributes for data validation. NET MVC project and select the Empty project template.

The recommended approach is to create a metadata class and decorate its properties with data annotation attributes. Add a new class in the Models folder and name it User Profile Metadata.

Write the following code in the User Profile Metadata class.