How to update one field of specific records using Entity Framework?

Question

I want update family of a person who his name is pejman. This is my object Class:

public class Person
{
    public int Id { get; set; }
    public string FirstNa         


        

Answer 1

Any Object This makes Easier to update.

using (var db = new DBContext())
        {
            AppUser au = new AppUser()
            {
                AppUserId = (int)txtID.Content,
                UserName = txtUserName.Text,
                Password = txtPwd.Password.ToString(),
            db.Entry(au).State= EntityState.Modified;
            db.SaveChanges();
        }