c#中对mdi的操作，代码见内（child部分）

child.cs<br>
------------------------------------------------------------<br>
<br>
using System;<br>
using System.Drawing;<br>
using System.Collections;<br>
using System.ComponentModel;<br>
using System.Windows.Forms;<br>
<br>
namespace testagain<br>
{<br>
&nbsp;&nbsp;&nbsp;&nbsp;/// &lt;summary&gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;/// Summary description for child.<br>
&nbsp;&nbsp;&nbsp;&nbsp;/// &lt;/summary&gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;public class child : System.Windows.Forms.Form<br>
&nbsp;&nbsp;&nbsp;&nbsp;{<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;private System.Windows.Forms.Label lbl_about;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;private System.Windows.Forms.Label label1;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;/// &lt;summary&gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;/// Required designer variable.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;/// &lt;/summary&gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;private System.ComponentModel.Container components = null;<br>
<br>

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