我看不到标签文本。我该怎么办？

的数据

public partial class Form1 : Form
    {

        Random rnd = new Random();
        string[] Maths = { "Add", "Subtract", "Multiply" };
        int[] total = new int[5];
        int score = 0;

        public Form1()
        {
            InitializeComponent();
            SetUpGame();
        }

        private void SetUpGame()
        {
            string[] seq_Left = { lblNum1Left.Text, lblNum2Left.Text, lblNum3Left.Text, lblNum4Left.Text, lblNum5Left.Text };
            string[] seq_Right = { lblNum1Right.Text, lblNum2Right.Text, lblNum3Right.Text, lblNum4Right.Text, lblNum5Right.Text };
            string[] seq_Symbol = { lblSymbol1.Text, lblSymbol2.Text, lblSymbol3.Text, lblSymbol4.Text, lblSymbol5.Text };
            string[] seq_Answer = { txtAnswer1.Text, txtAnswer2.Text, txtAnswer3.Text, txtAnswer4.Text, txtAnswer5.Text };

            for (int i = 0; i < 5; i++)
            {
                int numA = rnd.Next(10, 20);
                int numB = rnd.Next(0, 9);

                seq_Answer[i] = "";

                switch (Maths[rnd.Next(0, Maths.Length)])
                {
                    case "Add":
                        total[i] = numA + numB;
                        seq_Symbol[i] = "+";
                        break;

                    case "Subtract":
                        total[i] = numA - numB;
                        seq_Symbol[i] = "-";
                        break;

                    case "Multiply":
                        total[i] = numA * numB;
                        seq_Symbol[i] = "x";
                        break;
                }

                seq_Left[i] = numA.ToString();
                seq_Right[i] = numB.ToString();
            }
        }
    }

字符串
在最后几行中，我将nums转换为string并赋值给文本。所以我应该看到文本，但我没有。如果我不使用seq[]，代码会太长。