Asp.Net MVC Model Validations using Data Annotations Example

Introduction: 

Here I will explain how to implement model validations using data annotations in asp.net mvc with example or add validation to model in asp.net mvc with examples or asp.net mvc validate model properties / attributes using data annotations with example or asp.net mvc model validation to allow only alphabets in textbox with example. In asp.net mvc we can easily implement validation on model properties by using DataAnnotations properties.

Description:
  
In previous articles I explained asp.net mvc compare model properties with example, jQuery Google Pie chart in asp.net with database, sql server get string before and after with example, sql query to get data month wise and year wise with example, sql query to exclude weekends with example, asp.net mvc crud operations using entity framework, Use mysql database in asp.net with examples and many articles relating to asp.net mvc , asp.net, c#,vb.net . Now I will explain how to implement model validations using data annotations in asp.net mvc with example.

Generally in asp.net mvc we can easily implement validations to model properties by using DataAnnotations. We will see how to implement validation to model properties with example for that create asp.net mvc application and Open visual studio à Go to File à Select New à Project like as shown below

Once we select Project new popup will open in that select Asp.Net Web Application and give name to application and click OK like as shown below

Once click OK new popup will open in that select Empty template and select folders and core reference as MVC and click OK like as shown below

Once we finished creating application our project structure will be like as shown below

Now right click on your Models folder à select Add à select Class like as shown below.

Once we add new model (UsersModel) open it and write code like as shown below.

using System.ComponentModel.DataAnnotations; namespace MVCExamples.Models { public class UsersModel { [Key] public int UserId { get ; set; } [RegularExpression("^[a-zA-Z]*$", ErrorMessage = "Only Alphabets are Allowed")] [Required(ErrorMessage="Please Enter Username")] public string UserName { get ; set; } [Required(ErrorMessage="Please Enter Password")] public string Password { get ; set; } [Required(ErrorMessage="Please Enter Confirm Password")] [Compare("Password",ErrorMessage= "Both Password and Confirm Password Must be Same" )] public string ConfirmPassword { get; set; } [Required(ErrorMessage="Please Enter Location")] public string Location { get ; set; } } }

If you observe above code we added DataAnnotations reference and used validation properties Required, Compare , RegularExpression properties to compare multiple properties and allow only alphabets in username field, etc. based on our requirements.

Now add new controller for that right click on your Controllers folder à select Add à select Controller like as shown below.

Once we click on Controller new popup will open in that select MVC 5 Controller - Empty and click Add like as shown below.

Once click on Add new window will open in that give name of controller and click Add button then new controller file will add to folder. Now open new controller (UserController) and write the code like as shown below

using System.Web.Mvc; namespace MVCExamples.Controllers { public class UserController : Controller { // GET: User public ActionResult Index() { return View(); } public ActionResult UserRegistration() { return View(); } } }

Now right click on UserRegistration method and select Add View like as shown below

Once click Add View new template will open in that select Template type “Create” and Model class as our “UsersModel” and click Add like as shown below.

Once we add view that will be like as shown below.

Now run your application and check the output that will be like as shown below

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