สอบถามเกี่ยวกับ Array.GetValue หน่อยครับพอดีว่ารันไม่ผ่านสักทีติดอยู่ที่เดียว

int[] Score = new int[4];
	Score[0] = 12;
	Score[1] = 32;
	Score[2] = 40;
	Score[3] = 23;
int x = Score[0];

List<int> Score = new List<int>(new int[] { 12, 32, 40,23 });
int x = Score.IndexOf(0)

   private void GetValueBT_Click_1(object sender, EventArgs e)
        {
            int[] Score = { 12, 32, 40, 23 };
            int , X;
            X = Convert.ToInt32(Score.GetValue(0));
        }

for (int i = 0; i < Score.Length; i++)
            {
                showLB.Text = Score[i].ToString();
            }

for (int i = 0; i < Score.Length; i++)
{
    showLB.Text += Score[i].ToString();
}

showLB.Text   = string.Join("", Score);