why asp.net wont delete my row?
<p>Im trying to delete a row from my Database,</p>

<p>this is my code :</p>

<pre><code>sql = "delete sum_lines from sum_lines join sum_tbl on sum_lines.summary_id = sum_tbl.id where sum_tbl.user_id = @userId and sum_lines.line_id ='@lineId'";

        SqlConnection con = new SqlConnection(conString);
        dataObj = new DataObj();
        SqlCommand com = new SqlCommand(sql, con);
        com.Parameters.Add(new SqlParameter("@userId", userId));
        com.Parameters.Add(new SqlParameter("@lineId", lineId));


        con.Open();
        com.ExecuteNonQuery();
        con.Close();
</code></pre>

<p>the thing is, that if Im trying my sql statement in the management tool , it works perfectly.
but it wont effect on my database when my code is running.</p>

<p>it DOES go to this code, I can see in my debug mode, but it wont effecting for some reason . 
any inputs ?</p>
