When we run the application, and when we enter more than 30 characters in the LastName textbox, then we will get the below default error message: To achieve this we need to decorate the LastName property with the StringLength attribute as shown below. We can achieve this very easily using the StringLength data annotation attribute in the ASP.NET MVC application. In our last example, we are forcing the user to enter his first name and last but what happens if he enters a name with enormous length? For example, our business requirement is that the employee’s LastName should not be greater than 30 characters that mean we need to set a maximum of 30 characters that can be entered for the employee the last name. With the above changes, if someone tries to submit the page without providing the FirstName and LastName values, then it will give the user-defined error message as shown in the below image. But if you want to provide some user-defined error message when validation fails, then you can use the other overloaded version of the Required attribute which accepts ErrorMessage as an input parameter as shown below. With the required attributes in place, if someone tries to submit the page without providing the FirstName and LastName values, then it will give you the default error as shown in the above image. When we submit the page without providing the FirstName and LastName of an employee, we will get the error message as shown in the below image. The built-in required validation attributes provide both client-side and server-side validation like other built-in validation attributes. The Required attribute raises a validation error, if either the property value is null or empty. The Required attribute makes the model property as required. That means we will force the Employee to give the first name and last name we can achieve this very easily in the ASP.NET MVC application by decorating the FirstName and LastName properties of the Employee Model with the Required data annotation attribute as shown below. Our business requirement is that the First name and Last Name of an employee can’t be empty. Let’s understand Required Attribute with one example. These attributes provide Server-side validation as well as client-side validation. Note: Data annotations are the attributes that we can find in the namespace. Data Structures and Algorithms Tutorials.
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