Sample.cs

public class Employee
 {
     public Employee()
     {
     }

     ///Primary Key
     public int EmpId
     {
         get;
         set;
     }

     public string EmpName
     {
         get;
         set;
     }

     ///Specify the same name as in the department
     public int DeptId
     {
         get;
         set;
     }

     public virtual Department Department { get; set; }
 }

 public class Department
 {
     ///Primary Key
     public int DeptId
     {
         get;
         set;
     }        

     public string DepartmentName
     {
         get;
         set;
     }
 }