服务器端FileUpload上传控件如何禁止手动输入并且不能粘贴

<asp:FileUpload   ID= "FileUpload1 "   ContentEditable= "false "   runat= "server "   Width= "350px "     onchange= 'PicChange(); '   />

只需要设置：ContentEditable= "false " 既可。  

另：禁止手动输入到可以用 onkeydown= "event.returnValue=false; "   onpaste= "return   false "