<%if request <>""  then
username=request("usernam")
password=request("password")
set rs=server.CreateObject("Adodb.recordset")
sql="select * from yuaner_admin where username='"&username&"' and  password='"&password&"' "
rs.open sql,conn ,1,1
     if rs("admin")<>username and rs("password")<>password then
           response.write("您的输入不正确")
     else
  
            session("UserName")=request("username")
            session("PassWord")=md5(request("password"))
     end if
end if
每次进入页面都先显示您的输入不正确,应怎么加条件

<%
if session("UserName")="" or session("UserName")=null then
username=request("usernam")
password=request("password")
set rs=server.CreateObject("Adodb.recordset")
sql="select * from yuaner_admin where username='"&username&"' and  password='"&password&"' "
rs.open sql,conn ,1,1
     if rs("admin")<>username and rs("password")<>password then
           response.write("您的输入不正确")
     else
  
            session("UserName")=request("username")
            session("PassWord")=md5(request("password"))
            respinse.redircet("admin.asp")

     end if
end if
是这样吗

好像不怎么通顺，
session不为空才做后面的，一开始就为空，那不是一直不做