While developing the MVC applications you need to provide validations that mainly work on the client end.

 public class EmployeeModel
    {

        public int EmpId { get; set; }
        [Required(ErrorMessage = "First Name is required")]
        public string FirstName { get; set; }
        public string MiddleName { get; set; }
        [Required(ErrorMessage = "Last Name is required")]
        public string LastName { get; set; }
        [Required(ErrorMessage = "PhoneNo is required")]
        public string PhoneNo { get; set; }
        public string Address { get; set; }
        public getstatus Status { get; set; }
        public string msg { get; set; }
    }

There is another setting that needs to be checked while performing validations in the Web.config.

 <appSettings>
    <add key="webpages:Version" value="3.0.0.0"/>
    <add key="webpages:Enabled" value="false"/>
    <add key="ClientValidationEnabled" value="true"/>
    <add key="UnobtrusiveJavaScriptEnabled" value="true"/>
  </appSettings>

You need to put the bundle files at the last section of your view .

@section Scripts {
    @Scripts.Render("~/bundles/jqueryval")
}

You also have to check whether the code is being checked before the database or before other call being made.

[HttpPost]
        public ActionResult RegisterEmployeeDetails(EmployeeModel EmpModel)
        {
            EmpModObj = new EmployeeModel();
            try
            {
                if (ModelState.IsValid)
                {
                    EmpRepObj = new EmployeeRepository();
                    EmpRepObj.SaveDetails(EmpModel);
                }
                else
                {
                    return View("RegisterEmployee");
                }
            }
            catch (Exception ex)
            {
                EmpModObj.msg = ex.Message;
            }
            return View(EmpModel);
        }