// Controls可以用Name值为索引,假如是个两维数组可以像下面这样:
string[,] arr = new string[4, 4];
for (int i = 0; i < arr.GetLength(0); i++)
{
for (int j = 0; j < arr.GetLength(1); j++)
{
var key = string.Format("TextBox_{0}_{1}", i, j);
((TextBox)Controls[key]).Text = arr[i, j];
}
}