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將集合(陣列或物件集合)的每一元素取出
string[ ]  student = new string[5]{"1","2","3","4","5"};
foreach (string buf in student)
{
   MessageBox.Show(buf);
}
foreach (System.Windows.Forms.Control obj in this.Controls)
{
  if (obj.GetType().ToString() == "System.Windows.Forms.TextBox")
  {
     obj.Text = "這是文字方塊";
  }
}
 
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