![]() Finally, the attribute checks whether a property value matches a pattern as specified by a regular expression. The attribute checks whether a property value is a valid URL. In the above example, the attribute checks whether the Age is between 18 and 100. The attribute checks whether a property value falls between a minimum and a maximum value. The attribute validates a property for a valid email address. If you don’t specify any ErrorMessage, a default error message is displayed. The ErrorMessage property of the data annotation attribute indicates an error message that will be displayed in case there is any validation error. For example, the attribute used on the FirstName property specifies the maximum length for FirstName to be 50 and MinimumLength to be 3. The attribute is used to specify the maximum length and optionally the minimum length for a property value. The attribute indicates that a property value must be provided. If you don’t use the attribute a property name will be used for display purpose. This friendly name is used by HTML helpers such as Html.LabelFor() to display the field name on a view. The attribute is used to specify a friendly name for the property under consideration. Notice the attributes that are used to decorate these properties. The UserProfileMetadata class contains property definitions for FirstName, LastName, Email, Bio, Age, BlogUrl and Phone. Write the following code in the UserProfileMetadata class. Let’s see how.Īdd a new class in the Models folder and name it UserProfileMetadata. The recommended approach is to create a metadata class and decorate its properties with data annotation attributes. 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. However, in this case our model class is an Entity Framework class. NET class (POCO) then you can directly decorate its properties with data annotation attributes. ![]() In this example, you will validate all of the columns except Id, using various data annotation attributes. Once you create the UserProfile table make sure to add an ADO.NET Entity Data Model to the project so that you get the UserProfile entity class as shown above. Id, FirstName, LastName, Email, Bio, Age, BlogUrl and Phone. ![]() The UserProfile table has columns as shown in the following figure:Īs you can see from the above model class, the UserProfile table consists of eight columns, viz. Then add a new SQL Server database named UserDb to the App_Data folder and create a table – UserProfile. Creating a Model Classīegin by creating a new ASP.NET MVC project and select the Empty project template. 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. If an error message is not specified, a default error message is displayed.
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