单击消息框是否会影响程序输出顺序

我正在尝试为内存游戏编写C#代码。我想首先向查看者展示矩阵（带有 3 个元素），然后为每个元素提供多个选项，一次突出显示该单元格。用户必须从答案面板中选择正确的元素。显示答案矩阵（定义为任务）执行此操作。如果我在显示答案任务的 for 循环中放置一个消息框，则输出序列（显示矩阵、显示答案等）对于首先显示的每个元素都可以正常工作。我在每个答案显示后单击并等待下一个。它工作正常。但是，如果我删除消息框（因此无需单击），程序在显示答案后停止（对于第一个元素）.有人可以帮助我吗？相关代码部分包括：

Mainform{
......declare number of textboxes and lables...for matrix display
}
 In the Buttonclick from the main form:
{
var firstTask = new Task(() => invokedisplaymatrix(MatrixInfoValues));
var secondTask = firstTask.ContinueWith((t) => invokedisplayblankmatrix(MatrixInfoValues));
var thirdTask = secondTask.ContinueWith((t) =>invokedisplayanswermatrix(MatrixInfoValues));
var fourthTask = thirdTask.ContinueWith((t) => invokedDoselection(MatrixInfoValues));
            firstTask.Start();
}
  private void invokedisplaymatrix(object Minfo1)
        {
            lock (this)
            {
                Invoke(new displaymatrixdelegate(displaymatrix), new object[] { Minfo1 });
                Thread.Sleep(2000);
            }
        }
        private void invokedisplayblankmatrix(object Minfo2)
        {
            lock (this)
            {
                Invoke(new displayblankmatrixdelegate(displayblankmatrix), new object[] { Minfo2 });
            }
        }
        private void invokedisplayanswermatrix(object Minfo3)
        {
            lock (this)
            {
                Invoke(new displayanswermatrixdelegate(displayanswermatrix), new object[] { Minfo3 });
                // Invoke(new displaymatrixdelegate(displaymatrix),new object[] {indx});
            }
        }
..Then in the display answer matrix function:
 public void displayanswermatrix(int[] Minfo3)
        {
 foreach (int ind in FilledTextBoxID2)
            {
                foreach (Control c in splitContainer1.Panel1.Controls)
                {
                    if (c is TextBox && c != null)
                    {
                        if ((boxindexL + 1) == FilledTextBoxID2[j])
                        {
                            c.BackColor = Color.OrangeRed;
                        }
                        else
                        {
                            c.BackColor = Color.MediumSpringGreen;
                        }
                       boxindexL = boxindexL + 1;
                    }
                }
                int AnswerLocation = RandomNumber(1, 5);
                int[] answeroptions=excludenumberfromarray(MatrixValues2[j]); //write a function to make random numbers between 1 and 9 excluding MatrixValues2[j]
                foreach (Control c in splitContainer1.Panel2.Controls)
                {
                    if (c is TextBox)
                    {
                        //c.Text = Convert.ToString(boxindexR);
                            //answeroptions[boxindexR]);
                        if ((boxindexR + 1) == AnswerLocation)
                        {
                            c.Text = Convert.ToString(MatrixValues2[j]); //boxindexR = boxindexR - 1;
                        }
                        else
                        {
                            c.Text = Convert.ToString(answeroptions[boxindexR]);
                        }
                       //
                       //}//placing the required number in the randomly selected box
                       boxindexR = boxindexR + 1;
                    }
                 }

                Thread.Sleep(2000);
               MessageBox.Show("hello after one number");
 j = j + 1;
                boxindexR = 0; boxindexL = 0;
            }//end of first foreach
        }//display answer matrix end

如果我评论消息框，界面在第一个元素显示后就在那里睡觉。我可以知道这个错误是怎么来的吗？

- is there any more of X to do? 
  - yes: do (a single) X
  - no: is there any more of Y to do? 
    - yes: do (a single) Y
    - no: is there any more of Z to do?
      - yes: do (a single) Z
      - no: stop timer