public async Task <IActionResult> SubmitAssignment(int courseId, IFormFile assignment) { var fileExtensions = new[] { ".zip", ".pdf" }; var checkExtensions = Path.GetExtension(assignment.FileName); if (!fileExtensions.Contains(checkExtensions) || assignment.Length > AssignmentConstants.ASSIGNMENT_FILE_LENGTH) { this.TempData[AssignmentMessagesConstants.TEMPDATA_ERROR_MESSAGE] = AssignmentMessagesConstants.ASSIGNMENT_FILE_EXTENSION_AND_SIZE_MESSAGE; return(RedirectToAction(nameof(Details), new { courseId })); } var assignmentContent = await assignment.ConvetToByteArrayAsync(); var userId = this.userManager.GetUserId(User); var submitAssignment = await this.assignmentService.SaveAssignmentAsync(courseId, userId, assignmentContent); if (!submitAssignment) { return(BadRequest()); } this.TempData[AssignmentMessagesConstants.TEMPDATA_SUCCESS_MESSAGE] = $"'{assignment.FileName}' {AssignmentMessagesConstants.ASSIGNMENT_FILE_SUCCESSFULLY_UPLOADED_MESSAGE}"; return(RedirectToAction(nameof(Details), new { courseId })); }