(webform)我如何从9个不同的文本框得到的值，并通过升序返回值

这是webform(asp.net c#)的代码:

 protected void Button2_Click(object sender, EventArgs e)
{
    int no1;
    int no2;
    int no3;
    int no4;
    int no5;
    int no6;
    int no7;
    int no8;
    int no9;
    no1 = int.Parse(txt1.Text);
    no2 = int.Parse(txt2.Text);
    no3 = int.Parse(txt3.Text);
    no4 = int.Parse(txt4.Text);
    no5 = int.Parse(txt5.Text);
    no6 = int.Parse(txt6.Text);
    no7 = int.Parse(txt7.Text);
    no8 = int.Parse(txt8.Text);
    no9 = int.Parse(txt9.Text);

    int[] a = new int[] {no1,no2,no3,no4,no5,no6,no7,no8,no9 };
    Array.Sort(a);
    foreach (var str in a)
    {
          MessageBox.Show(str.ToString()); //display in MessageBox, but i want to display back to 9 different textbox.
    }

可以在MessageBox中显示结果。但我不能显示结果回到9个不同的文本框。我怎样才能找到解决办法呢?谢谢你！这是输出http://i.gyazo.com/a91f7ffef1d6d1fa7815890464df3082.png

txt1.Text = a[0];
txt2.Text = a[1];
txt3.Text = a[2];
txt4.Text = a[3];
txt5.Text = a[4];
txt6.Text = a[5];
txt7.Text = a[6];
txt8.Text = a[7];
txt9.Text = a[8];