Request.Form得到的为什么是乱码?

asp.net里: int id = Convert.ToInt32(Request.QueryString["id"]); string comment = Request.Form["comment"].ToString(); string commenter = Request.Form["commenter"].ToString(); Response.Write(commenter);页面上: <p> <font color="#7B7867" size="2" face="Arial, Helvetica, sans-serif"> <br> <form action=../../comment.aspx?id=67 method=POST><input type=text name="commenter" value="匿名"><textarea name="comment"></textarea><input type=submit value=提交></form> <br> </font></p>