Here is the Gif image which shows different errors. Now, When I tried to add some data and some with wrong details When I tried to submit form without adding any data Step 5: Build your project and navigate to " page to create Student and check Validation's, the output will be as below If (_birthDate > minDate & _birthDate => => => => => a.Age) Protected override ValidationResult IsValid(object value, ValidationContext validationContext)ĭateTime _birthDate = Convert.ToDateTime(value) ĭateTime minDate = Convert.ToDateTime("01-01-1998") ĭateTime maxDate = Convert.ToDateTime("01-01-2008") Public class ValidateBirthDate : ValidationAttribute So, right-click on your projects Model Folder, create a new class, Name it "ValidateBirthDate" using System We can easily create custom validation data annotation in MVC by deriving ValidationAttribute class and then overriding IsValid method which returns ValidationResult for this example. Now before we proceed, let's create the Custom Validation Creating Custom Validation in MVC A custom attribute through which I do the manual server-side validation. DataType for specifying it to be of date time. So, for this field, I have provided 2 attributes –Ī. Name: A required field, just provide Required attribute to it.Īge: Age field is also required, but we also need to impose range field as Age must be greater than 20 while it should be above 10 Įmail: Making this field also as Required, but we will more data annotation in it, like Display(Name="Email address") which is used to display the label text in Razor form, another data annotation will be EmailAddress attribute with error message described īirthDate: Must be a data and between 01-25-1998 & 01-25-2008. I will describe each field data annotation now. Now in the above Model, we have just created the Model with properties, let's add some Data Annotation attributes( few of the above mentioned) to validate all the fields. Let's create a Student.cs Model by right-clicking on Models folders and add a new class. Step 2: Create Model with properties which we need to save in database( we will not consider saving details in the database in this article, just validating the Model) Now select MVC template to generate default layout. Step 1: Create a MVC project in your Visual Studio, by navigating to File -> New -> Project (Select 'Web' from left pane & Select 'ASP.NET web application' from right pane)Įnter the name of your project(DataAnnotationMVC) and click "Ok" Let's create a simple form with basic details, to check how can we implement server-side validation in ASP.NET MVC using Data annotation. Validating form using Data Annotation in ASP.NET MVC - Data field value must match the specified regular expression pattern.– Allows hiding fields from editor forms.
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