Person Entity

DbContextExtensions.cs

public static DbContextExtensions
{
     public static void EntryAsModified<T>(this DbContext context, T entity) where T : class
     {
         context.Entry(entity).State = EntityState.Modified;
     }

     public static void EntriesAsModified<T>(this DbContext context, IEnumerable<T> entities) where T : class
     {
         foreach(var entity in entities)
         {
              context.Entry(entity).State = EntityState.Modified;
         }
     }
}

Entity.cs

using System.ComponentModel.DataSetAnnotations;

public class Person
{
     [Key]
     public int ID { get; set; }
     [StringLength(100)]
     public string FirstName { get; set; }
     [StringLength(100)]
     public string LastName { get; set; }
}

EntryState.cs

public class Program
{
     public static void Main(string[] args)
     {
         var person = GetModifiedPersonMethod();
         var context = new EntityContext();
         context.Entry(person).State = EntityState.Modified;
         context.SaveChanges();
     }
}

ModifyEntity.cs

using System.Data.Entity;


public class Program
{
      public static void Main(string[] args)
      {
          var modifiedPerson = new Person
                          { 
                                ID = 1,
                                FirstName = "John",
                                LastName = "Doe"
                          };
           
          var context = new EntityContext();
          var originalPerson = context.People.Find(1);
          
          originalPerson.FirstName = modifiedPerson.FirstName;
          originalPerson.LastName = modifiedPerson.LastName;

          context.People.Attach(originalPerson);
          context.SaveChanges();
      }
}

UsingExtension.cs

public class Program
{
     public static void Main(string[] args)
     {
         var person = GetModifiedPersonMethod();
         var context = new EntityContext();
         context.EntryAsModified(person);
         context.SaveChanges();

         var people = GetModifiedPeopleMethod();
         context.EntriesAsModified(people);
         context.SaveChanges();
     }
}