Validations in entity framework

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MVC6

Hi, I am doing one project in that i added database to model through entity frame work.Now i need to validate some data.I dont know where to add validations.Can anybody help me.....
I have tried to add validations in model -> Model1.edmx -> Model1.tt -> Login.cs
but it is not working out

What I have tried:

//------------------------------------------------------------------------------
// <auto-generated>
//     This code was generated from a template.
//
//     Manual changes to this file may cause unexpected behavior in your application.
//     Manual changes to this file will be overwritten if the code is regenerated.
// </auto-generated>
//------------------------------------------------------------------------------

namespace DOT_NET_COMMUNITY.Models
{
    using System;
    using System.Collections.Generic;
    using System.ComponentModel.DataAnnotations;
    
    public partial class Login
    {
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")]
        public Login()
        {
            this.Articles = new HashSet<Article>();
            this.ForumReplies = new HashSet<ForumReply>();
            this.Forums = new HashSet<Forum>();
            this.Projects = new HashSet<Project>();

        }
        public int LoginId { get; set; }
        [Required(ErrorMessage = "Name Required")]
        public string Name { get; set; }
        [Required(ErrorMessage="Please enter User Name")]
        public string Username { get; set; }
        [Required(ErrorMessage = "Please enter Password")]
        public string Password { get; set; }
        [Required(ErrorMessage = "Please give security Que")]
        public string SecQuestion { get; set; }
        [Required(ErrorMessage = "Please enter Ans")]
        public string Answer { get; set; }
        [Required(ErrorMessage = "Please give the status")]
        public string Status { get; set; }
    
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
        public virtual ICollection<Article> Articles { get; set; }
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
        public virtual ICollection<ForumReply> ForumReplies { get; set; }
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
        public virtual ICollection<Forum> Forums { get; set; }
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
        public virtual ICollection<Project> Projects { get; set; }
    }
}