public interface IEmployeeService
{
    [OperationContract]
    [WebInvoke(Method = "GET", ResponseFormat = WebMessageFormat.Json,
    RequestFormat = WebMessageFormat.Json, BodyStyle = WebMessageBodyStyle.Wrapped ,
    UriTemplate = "getEmployee/")]
    List<EmployeeEntity> getEmployee();

    [OperationContract]
    [WebInvoke(Method = "GET", ResponseFormat = WebMessageFormat.Json,
    RequestFormat = WebMessageFormat.Json, BodyStyle = WebMessageBodyStyle.Wrapped,
    UriTemplate = "getEmployeeFromDb/")]
    List<Student> getEmployeeFromDb();

    [OperationContract]
    [WebInvoke(Method = "DELETE", ResponseFormat = WebMessageFormat.Json,
    RequestFormat = WebMessageFormat.Json, BodyStyle = WebMessageBodyStyle.Wrapped,
    UriTemplate = "/DeleteEmployee")]
    string DeleteEmployee(string Id);
}

public string DeleteEmployee(string Id)
    {
        int iEmpId = 0; int.TryParse(Id, out iEmpId);
        if (iEmpId > 0)
        {
            StudentEntityModel Db = new StudentEntityModel();
            Student Std = Db.Student.Where(w => w.Sid == iEmpId).FirstOrDefault();
            if(Std !=null)
            {
                Db.Student.Remove(Std);
                Db.SaveChanges();
                return "Deleted";
            }
            else { return "Failed."; }
        } else { return "Failed."; }
    }
    public List<EmployeeEntity> getEmployee()
    {
        return new List<EmployeeEntity> {
            new EmployeeEntity {Sid=1,Name="Muruganvc", Gender="Male" , Email="muruganvc@gmail.com" },
            new EmployeeEntity {Sid=2,Name="Keerthis", Gender="Female" , Email="Keerthis@gmail.com" },
            new EmployeeEntity {Sid=3,Name="Divyap", Gender="Female" , Email="Divyap@gmail.com" },
        };
    }
    public List<Student> getEmployeeFromDb()
    {
        StudentEntityModel Db = new StudentEntityModel();
        return Db.Student.ToList();
    }
}