在客户端：

<script type="text/javascript">
    function ShowDetailPopup(FPS_Code, PhaseNo) {
      popup.SetContentUrl("test4.aspx?id=" + FPS_Code + "&PhaseNo=" + PhaseNo);
      popup.Show();
    }
</script>

在服务器端：

using (SqlConnection con = new SqlConnection(strcon1))
{
    SqlCommand cmd = new SqlCommand("SELECT ID,DocumentNo,ReleaseNo,PhaseNo,FPS_Code,DrawingNo  FROM   Project1 WHERE FPS_Code=@FPS_Code and PhaseNo=@PhaseNo");

    cmd.Parameters.AddWithValue("@FPS_Code", Request.QueryString["id"].ToString());
    cmd.Parameters.AddWithValue("@PhaseNo", Request.QueryString["PhaseNo"]);

    cmd.CommandType = CommandType.Text;
    cmd.Connection = con;
    con.Open();
    SqlDataReader sdr = cmd.ExecuteReader();
    while (sdr.Read())
    {
        ASPxLabel1.Text = sdr["ID"].ToString();
        ASPxLabel2.Text = sdr["ReleaseNo"].ToString();
        ASPxLabel3.Text = sdr["PhaseNo"].ToString();
        ASPxLabel4.Text = sdr["DrawingNo"].ToString();
        ASPxLabel5.Text = sdr["FPS_Code"].ToString();
       
    }

    con.Close();

}