ASP.NET上傳圖片時，產生預覽

<tr bgcolor="#f5f5f5">
     <td height="30" align="center" valign="middle">圖片鏈接</td>
     <td height="35" align="center" valign="middle"><input type="file" name="uploadfile1" runat="server" id="uploadfile1" onpropertychange="document.all.imgID.src='file:///'+this.value"> &nbsp;
     </td>
    </tr>
    <tr bgcolor="#f5f5f5">
     <td height="70" align="center" valign="middle">縮略圖</td>
     <td height="70" align="center" valign="middle"><img id="imgID" width="82" height="65" border="0" >&nbsp;
     </td>
    </tr>