arguement exception as Fill:excepted non empty string Parameter src table : private void Window1_Loaded(object sender, RoutedEventArgs e)
        {
            con.Open();
            string testTable = StudentPage.testTable;
            adp = new SqlDataAdapter("SELECT TOP 5 * FROM " + testTable + " ORDER BY NEWID()", con);
            ds.Clear();
            adp.Fill(ds, testTable);
            alltables = ds.Tables;
            MyTable = alltables[testTable];
            AllRows = MyTable.Rows;
            
            MyRow = AllRows[0];
            GetData();
            rowPointer = 0;
            currentPage = 0;
            crtAnswer = 0;
            ViewStatus = new bool[] { true, false, false, false, false };
            isBookmarked = new bool[] { false, false, false, false, false };
            SelectedOption = new int[] { -1, -1, -1, -1, -1 };
            MyTimer.Interval = System.TimeSpan.FromSeconds(1);
            MyTimer.Start();
            btnFirst.IsEnabled = false;
            btnPrevious.IsEnabled = false;
            lblQuesInfo.Content = "Question 1/5";

            WindowState = WindowState.Maximized;
        }
i am currently developing online examination system using c# windows application 
while i run this code i am getting arguement exception as Fill:excepted non empty string Parameter src table