Multi-User Issues

Apr 16, 2008

I've taken over development of a Vs2003(vB)/MsSql2000 application which usually runs in on a Windows 2000 server with multiple workstations running the application simultaneously in Remote Desktop Sessions.


The central user interface element of the application is an un-databound grid (actually a farpoint spreadsheet) which displays sql table rows that are accessable from every workstation. The grid refreshes its content whenever a specific subroutine is called. That subroutine performs a query which loads its results into a collection which is then loaded into the grid. The subroutine is called during startup and at other times using the rather elaborate mechanism described below. Each workstation also has the ability to modify any row in the grid via a dialog-based editor. The grid itself is not setup to allow inplace editing.


The grid usually contains about 200 records and 20-50% of these records get modified (some repeatedly) every hour.

My question involves the classic multi-user issues of keeping all of the seperate workstation's grids current as individual workstations make modifications to the data.


What is Microsoft's recommended method for handling multi-user data-refresh requirements in custom applications written in VB.NET2003 with MsSQL2000?


Now that you know what I'm looking for, let me add a little more detail. The existing code handles this multi-user refresh issue in the following way...


A SQL Trigger is attached to the SQL Table's Insert/Modify and Delete events. That Trigger calls the xp_logevent built-in stored procedure to make an entry in the NT Event Log.
The application contains a subroutine to handle EventLog("Application").EntryWritten messages. That subroutine calls the subroutine (mentioned earlier) which refreshes the grid contents through a new SQL query.

In this way, whenever any workstation changes the table data, a trigger fires which makes a log entry and broadcasts an EntryWritten message into the global windows environment. The individual applications (each running in their own RDP session) hear the message and respond by refreshing their grid.


This all seems a little "rube goldberg" to me, but it has worked for many years.


That is, until we moved the SQL2000 server to a seperate machine to improve program responsiveness.
Now when the trigger is fired and the log entry is made, the EntryWritten message is broadcast into the windows environment of the dedicated SQL server where there are no applications listening for it. Meanwhile, the applications continue to run with unrefreshed data on the (now) dedicated RDP server from where the EntryWritten messages cannot be "heard".


So my question really comes down to this...


In an environment where the SQL server and the RDP server are two seperate machines, what is the best method for coordinating multi-user screen refreshes across seperate applications running in distinct RDP Client sessions?


Thanks in advance for any assistance.
Peace,
Colt Taylor
Computer Golf Sofware

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