public IEnumerable<StudentModel> GetAllStudents()
        {
            List<StudentModel> students = new List<StudentModel>();
            sqlConnection1.Open();
            var reader = GetDatabaseResults("SELECT * FROM STUDENTS");
            
            if(reader.HasRows)
            {
                while(reader.Read())
                {
                    var First_Name = reader.GetString(0);
                    var Last_Name = reader.GetString(1);
                    var User = reader.GetString(3);
                    var Password = reader.GetString(4);
                    var student = new StudentModel { First_Name = First_Name, Last_Name = Last_Name, User = User, Password = Password };
                    students.Add(student);
                }
            }

            sqlConnection1.Close();

            return students;
        }
        public StudentModel GetStudentUser(string username)
        {
            var queryString = string.Format("SELECT First_Name, Last_Name, Student_ID, username, password FROM Students WHERE username = '******'", username);
            var student = new StudentModel();
           
            sqlConnection1.Open();

            var reader = GetDatabaseResults(queryString);

            if (reader.HasRows)
            {
                while (reader.Read())
                {
                    var First_Name = reader.GetString(0);
                    var Last_Name = reader.GetString(1);
                    var Student_ID = reader.GetInt32(2);
                    var User = reader.GetString(3);
                    var Password = reader.GetString(4);
                    student = new StudentModel { First_Name = First_Name, Last_Name = Last_Name, Student_ID = Student_ID, User = User, Password = Password };
                }
            }

            sqlConnection1.Close();

            return student;
        }