System.Data.SqlClient.SqlException: Incorrect syntax near COUNT.

hi when iam use this query for gridview in asp.net AND gridPaging

when sorting by CountDevice then go next paging .

Incorrect syntax near 'COUNT'.

System.Data.SqlClient.SqlException: Incorrect syntax near 'COUNT'.

    <asp:SqlDataSource ID="SQlD" runat="server" ConnectionString="<%$ ConnectionStrings:ICTPortalDBConnectionString %>"
                        SelectCommand="SELECT FDeviceOwnerID,FUserName, FFamily + ' ' + FName as [FullName] COUNT(*)CountDevice  FROM [VDB_Device]  GROUP BY FUserName ,FDeviceOwnerID ,FFamily,FName order by FullName"></asp:SqlDataSource