public HttpResponseMessage SaveFile()
        {
            //Create HTTP Response.
            HttpResponseMessage response = Request.CreateResponse(HttpStatusCode.OK);

            //Check if Request contains File.
            if (HttpContext.Current.Request.Files.Count == 0)
            {
                throw new HttpResponseException(HttpStatusCode.UnsupportedMediaType);
            }

            //Read the File data from Request.Form collection.
            HttpPostedFile postedFile = HttpContext.Current.Request.Files[0];

            //Convert the File data to Byte Array.
            byte[] bytes;
            using (BinaryReader br = new BinaryReader(postedFile.InputStream))
            {
                bytes = br.ReadBytes(postedFile.ContentLength);
            }

            //Insert the File to Database Table.
            AssignmentManagementSystemEntities _db = new AssignmentManagementSystemEntities();

            tblfile file = new tblfile
            {
                Name        = Path.GetFileName(postedFile.FileName),
                ContentType = postedFile.ContentType,
                Data        = bytes
            };

            _db.tblfiles.Add(file);
            _db.SaveChanges();

            return(Request.CreateResponse(HttpStatusCode.OK, new { id = file.id, Name = file.Name }));
        }
        //var message = "Routine Added Successfully";
        //    if (ModelState.IsValid)
        //    {
        //        asrDB.Add(arvm);
        //        //asrDB.SendEMail(arvm.Section_Id ,arvm.Semester_Id ,arvm.Faculty_Id, arvm);
        //        return Request.CreateResponse(HttpStatusCode.OK, message);
        //    }
        //    else
        //    {
        //        return Request.CreateErrorResponse(HttpStatusCode.BadRequest, ModelState);
        //    }
        // [Authorize(Roles = "admin")]

        public HttpResponseMessage Put()
        {
            var Id = Convert.ToInt32(HttpContext.Current.Request.Params["Id"]);
            var Assignment_Name         = HttpContext.Current.Request.Params["Assignment_Name"];
            var Teacher_Id              = HttpContext.Current.Request.Params["Teacher_Id"];
            var Assignment_Release_Date = HttpContext.Current.Request.Params["Assignment_Release_Date"];
            var Deadline      = HttpContext.Current.Request.Params["Deadline"];
            var Section_Id    = HttpContext.Current.Request.Params["Section_Id"];
            var Faculty_Id    = HttpContext.Current.Request.Params["Faculty_Id"];
            var Semester_Id   = HttpContext.Current.Request.Params["Semester_Id"];
            var Year_Batch_Id = HttpContext.Current.Request.Params["Year_Batch_Id"];
            var message       = "Routine Added Successfully";

            if (Assignment_Name == "")
            {
                ModelState.AddModelError("Assignment_Name", "Enter Assignment Name");
            }
            if (Teacher_Id == "")
            {
                ModelState.AddModelError("Teacher_Name", "Select Subject Teacher");
            }
            if (Assignment_Release_Date == "")
            {
                ModelState.AddModelError("Assignment_Release_Date", "Select Release Date");
            }
            if (Deadline == "")
            {
                ModelState.AddModelError("Deadline", "Select Assignmnet Deadline");
            }
            if (Section_Id == "")
            {
                ModelState.AddModelError("Section_Name", "Select Section");
            }
            if (Faculty_Id == "")
            {
                ModelState.AddModelError("Faculty_Name", "Select Faculty");
            }
            if (Semester_Id == "")
            {
                ModelState.AddModelError("Semester_Name", "Select Semester");
            }
            if (Year_Batch_Id == "")
            {
                ModelState.AddModelError("Year_Batch", "Select Year Batch");
            }
            //if (HttpContext.Current.Request.Files.Count == 0)
            //{
            //    ModelState.AddModelError("PDF", "Choose File");
            //}
            bool fieldChange        = false;
            tblAssignmentRoutine tb = _db.tblAssignmentRoutines.Where(a => a.Routine_Id == Id).FirstOrDefault();

            // var assign = asrDB.ListAll().Find(a => a.Id.Equals(Id));
            if (tb.Section_Id == Convert.ToInt32(Section_Id) && tb.Faculty_Id == Convert.ToInt32(Faculty_Id) && tb.Semester_Id == Convert.ToInt32(Semester_Id) && tb.YearBatchId == Convert.ToInt32(Year_Batch_Id))
            {
                fieldChange = false;
            }
            else
            {
                fieldChange = true;
            }


            if (ModelState.IsValid)
            {
                //Read the File data from Request.Form collection.

                if (HttpContext.Current.Request.Files.Count == 0)
                {
                    tb.Assignment_Name         = Assignment_Name;
                    tb.Teacher_Id              = Convert.ToInt32(Teacher_Id);
                    tb.Assignment_Release_Date = Convert.ToDateTime(Assignment_Release_Date);
                    tb.Deadline    = Convert.ToDateTime(Deadline);
                    tb.Section_Id  = Convert.ToInt32(Section_Id);
                    tb.Faculty_Id  = Convert.ToInt32(Faculty_Id);
                    tb.Semester_Id = Convert.ToInt32(Semester_Id);
                    tb.YearBatchId = Convert.ToInt32(Year_Batch_Id);
                    _db.SaveChanges();
                }
                else
                {
                    HttpPostedFile postedFile = HttpContext.Current.Request.Files[0];
                    byte[]         bytes;
                    using (BinaryReader br = new BinaryReader(postedFile.InputStream))
                    {
                        bytes = br.ReadBytes(postedFile.ContentLength);
                    }
                    //byte[] bytes;
                    //using (BinaryReader br = new BinaryReader(postedFile.InputStream))
                    //{
                    //    bytes = br.ReadBytes(postedFile.ContentLength);
                    //}

                    tb.Assignment_Name         = Assignment_Name;
                    tb.Teacher_Id              = Convert.ToInt32(Teacher_Id);
                    tb.Assignment_Release_Date = Convert.ToDateTime(Assignment_Release_Date);
                    tb.Deadline     = Convert.ToDateTime(Deadline);
                    tb.Section_Id   = Convert.ToInt32(Section_Id);
                    tb.Faculty_Id   = Convert.ToInt32(Faculty_Id);
                    tb.Semester_Id  = Convert.ToInt32(Semester_Id);
                    tb.YearBatchId  = Convert.ToInt32(Year_Batch_Id);
                    tb.Name         = Path.GetFileName(postedFile.FileName);
                    tb.Content_Type = postedFile.ContentType;
                    tb.Data         = bytes;
                    _db.SaveChanges();
                }
                //Convert the File data to Byte Array.

                //tblStudentRoutineRelation tsr = new tblStudentRoutineRelation();
                //var studnet = _db.tblStudents.Where(s => s.Faculty_Id == tb.Faculty_Id && s.Section_Id == tb.Section_Id && s.Semester_Id == tb.Semester_Id && s.YearBatchId == tb.YearBatchId).ToList();
                if (fieldChange)
                {
                    var studentlist = _db.tblStudentRoutineRelations.Where(s => s.RoutineId == tb.Routine_Id).ToList();
                    foreach (var item in studentlist)
                    {
                        _db.tblStudentRoutineRelations.Remove(item);
                    }
                    tblStudentRoutineRelation tsr = new tblStudentRoutineRelation();
                    var studnet = _db.tblStudents.Where(s => s.Faculty_Id == tb.Faculty_Id && s.Section_Id == tb.Section_Id && s.Semester_Id == tb.Semester_Id && s.YearBatchId == tb.YearBatchId).ToList();
                    foreach (var item in studnet)
                    {
                        tsr.RoutineId = tb.Routine_Id;
                        tsr.StudentId = item.Student_Id;
                        _db.tblStudentRoutineRelations.Add(tsr);
                        _db.SaveChanges();
                    }
                }
                return(Request.CreateResponse(HttpStatusCode.OK, message));
            }
            else
            {
                return(Request.CreateErrorResponse(HttpStatusCode.BadRequest, ModelState));
            }



            //var assign = asrDB.ListAll().Find(a => a.Id.Equals(arvm.Id));
            //string message = "Assignment Routine Updated Successfully";
            //if (ModelState.IsValid)
            //{
            //    asrDB.Update(arvm);
            //    return Request.CreateResponse(HttpStatusCode.OK, message);
            //}
            //else
            //{
            //    return Request.CreateErrorResponse(HttpStatusCode.BadRequest, ModelState);
            //}
        }
        public HttpResponseMessage Post()
        {
            var message                 = "Routine Added Successfully";
            var Assignment_Name         = HttpContext.Current.Request.Params["Assignment_Name"];
            var Teacher_Id              = HttpContext.Current.Request.Params["Teacher_Id"];
            var Assignment_Release_Date = HttpContext.Current.Request.Params["Assignment_Release_Date"];
            var Deadline                = HttpContext.Current.Request.Params["Deadline"];
            var Section_Id              = HttpContext.Current.Request.Params["Section_Id"];
            var Faculty_Id              = HttpContext.Current.Request.Params["Faculty_Id"];
            var Semester_Id             = HttpContext.Current.Request.Params["Semester_Id"];
            var Year_Batch_Id           = HttpContext.Current.Request.Params["Year_Batch_Id"];

            //var file= HttpContext.Current.Request.Files[0];
            if (Assignment_Name == "")
            {
                ModelState.AddModelError("Assignment_Name", "Enter Assignment Name");
            }
            if (Teacher_Id == "")
            {
                ModelState.AddModelError("Teacher_Name", "Select Subject Teacher");
            }
            if (Assignment_Release_Date == "")
            {
                ModelState.AddModelError("Assignment_Release_Date", "Select Release Date");
            }
            if (Deadline == "")
            {
                ModelState.AddModelError("Deadline", "Select Assignmnet Deadline");
            }
            if (Section_Id == "")
            {
                ModelState.AddModelError("Section_Name", "Select Section");
            }
            if (Faculty_Id == "")
            {
                ModelState.AddModelError("Faculty_Name", "Select Faculty");
            }
            if (Semester_Id == "")
            {
                ModelState.AddModelError("Semester_Name", "Select Semester");
            }
            if (Year_Batch_Id == "")
            {
                ModelState.AddModelError("Year_Batch", "Select Year Batch");
            }
            if (HttpContext.Current.Request.Files.Count == 0)
            {
                ModelState.AddModelError("PDF", "Choose File");
            }
            if (ModelState.IsValid)
            {
                //Read the File data from Request.Form collection.
                HttpPostedFile postedFile = HttpContext.Current.Request.Files[0];
                //Convert the File data to Byte Array.
                byte[] bytes;
                using (BinaryReader br = new BinaryReader(postedFile.InputStream))
                {
                    bytes = br.ReadBytes(postedFile.ContentLength);
                }

                //Insert the File to Database Table.
                AssignmentManagementSystemEntities _db = new AssignmentManagementSystemEntities();

                tblAssignmentRoutine tb = new tblAssignmentRoutine();
                tb.Assignment_Name         = Assignment_Name;
                tb.Teacher_Id              = Convert.ToInt32(Teacher_Id);
                tb.Assignment_Release_Date = Convert.ToDateTime(Assignment_Release_Date);
                tb.Deadline     = Convert.ToDateTime(Deadline);
                tb.Section_Id   = Convert.ToInt32(Section_Id);
                tb.Faculty_Id   = Convert.ToInt32(Faculty_Id);
                tb.Semester_Id  = Convert.ToInt32(Semester_Id);
                tb.YearBatchId  = Convert.ToInt32(Year_Batch_Id);
                tb.Name         = Path.GetFileName(postedFile.FileName);
                tb.Content_Type = postedFile.ContentType;
                tb.Data         = bytes;

                _db.tblAssignmentRoutines.Add(tb);
                _db.SaveChanges();

                tblStudentRoutineRelation tsr = new tblStudentRoutineRelation();
                var studnet = _db.tblStudents.Where(s => s.Faculty_Id == tb.Faculty_Id && s.Section_Id == tb.Section_Id && s.Semester_Id == tb.Semester_Id && s.YearBatchId == tb.YearBatchId).ToList();
                foreach (var item in studnet)
                {
                    tsr.RoutineId = tb.Routine_Id;
                    tsr.StudentId = item.Student_Id;
                    _db.tblStudentRoutineRelations.Add(tsr);
                    _db.SaveChanges();
                }
                return(Request.CreateResponse(HttpStatusCode.OK, message));
            }
            else
            {
                return(Request.CreateErrorResponse(HttpStatusCode.BadRequest, ModelState));
            }
        }