Environment.UserName as filter parameter

See more:

ASP.NET

SQL

server

hello,

could you explain me why Environment.UserName doesn't work in my SQL query ?
when i would say that doesn't work:
- <![CDATA[<% Response.Write(System.Environment.UserName)%>]]> displays the current username : hermans5

-my sql query works fine when i put 'hermans' contrary to '<% Response.Write(System.Environment.UserName)%> its displays anything...

here my code:

<asp:SqlDataSource ID="SqlDataSource1" runat="server" EnableCaching="True" FilterExpression="genacc_user_adacc = '<% Response.Write(System.Environment.UserName)%>'" ConnectionString="<%$ ConnectionStrings:LabAccManConnectionString %>"        SelectCommand="with cteDataList
as
(
SELECT account_user.genacc_user_adacc, genacc_machines.hostname, genacc_account.SPE, genacc_account.adacc, genacc_account.department,
   genacc_machines.software, genacc_machines.location, genacc_pw.pass, genacc_pw.key_index,
   row_number() over (PARTITION by account_user.genacc_user_adacc, genacc_machines.hostname order by genacc_pw.id desc) as Rown
FROM  genacc_pw INNER JOIN
   genacc_account ON genacc_pw.genacc_account_id = genacc_account.id INNER JOIN
   account_user ON genacc_account.id = account_user.genacc_account_id INNER JOIN
   genacc_machines ON genacc_account.id = genacc_machines.genacc_account_id
)
Select * from cteDataList
where RowN = 1
"ConflictDetection="CompareAllValues"></asp:SqlDataSource>

thanks in advance
best regards
Samuel