ckeditor在.cs文件中怎么赋值及取值

ckeditor在.cs文件中如何赋值及取值？
如题。

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var editor = CKEDITOR.replace("content");
editor.setData("");
alert(CKEDITOR.instances.content.getData());

var editor = CKEDITOR.replace("content");
alert(editor.getData());

 <script type="text/javascript" src="ckeditor/ckeditor.js"></script>
 CKEDITOR.replace('<%= txtSource.ClientID %>', { skin: 'kama' }); 
string value = txtSource.Text;
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取不到值?
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8楼 OK的