public string SaveAssignCourse(AssignCourse assignedCourse) { if (!courseAssignGateway.IsCourseIsAssined(assignedCourse.CourseId)) { if (courseAssignGateway.SaveAssignCourse(assignedCourse) > 0) { return("New Course are Assigned Into Teacher's "); } else { return("Course Assigned Failed to Teacher's!!! "); } } else { return("Sorry this Course isn't availeable to Assigned !!! Select Another Course ."); } }