一段简单的ASP 程序 帮我看一下哪里错了

<%
dim yzm
yzm=request.form"yzm"
set conn=Server.CreateObject("ADODB.Connection")
conn.Provider="Microsoft.Jet.OLEDB.4.0"
conn.Open Server.MapPath("yh.mdb")

set rs = Server.CreateObject("ADODB.recordset")


username=request.form("username")
password=request.form("password")
sql = "select * from 用户 where 用户名='" & username & "' and 密码='" & password & "'"

rs.Open sql, conn
if rs.eof  then
	response.write "用户名或密码不正确"
else
if cint(yzm)<>session("checkcode") then
   response.write"<script>alert('验证码错误');history.back();</script>"
end if
          response.cookies("username") = username
          response.write"<script>location href='.asp'</script>"
end if

rs.close
conn.close
%>

答案：dim yzm
yzm=request.form"yzm"
set conn=Server.CreateObject("ADODB.Connection")
connstr="Provider=Microsoft.Jet.OLEDB.4.0; data source="&server.MapPath("yh.mdb")

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