每一個控制項,都會有一個ID以供辨識 
下面範例介紹列出所有控制項ID
void Page_Load(object sender,EventArgs e)
{
       Response.Write("Control_ClientID Sample");
       // Get the list of all controls.
      IEnumerator myEnumerator = Controls.GetEnumerator();
      Response.Write("Enumerating Controls Collection");    
      while(myEnumerator.MoveNext())
      {
          Control   myControl = (Control) myEnumerator.Current;
          // Display the ClientID property 
          Response.Write("The ClientID property of Control : " + myControl.ClientID);
       }
 }
 
 
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