Force invalidate snapshot - how?

Hi,

In SQL 2005 SP1 - In my merge replication RMO C# script, I am getting the error that the merge snapshot is obsolete:

Source: Merge Replication Provider
Number: -2147201021
Message: You must rerun snapshot because current snapshot files are obsolete.

I am new to SMO/RMO and C#. I presume that I need to set the force-invalidate flag somewhere before generating another snapshot. I'm guessing that I can "try/catch" the error and handle it then (am I correct?) My script is running each step synchronously including synchronizing the subscription synchronously - meaning: subscription.SynchronizationAgent.Synchronize();

I presume the error occurs when I synch the subscription and there is an existing, but obsolete, snapshot file.

I would really appreciate it if someone could show me how to set the snapshot force_invalidate flag in RMO (preferably in C#). A fallback might be to delete any existing merge snapshot files, but I presume that would take much more time than setting the switch and calling for another snapshot to be generated. I wish I had some code to look at to show me an example of handling this error. If you can point me to such an example or can help me get around this error, I thank you.

I do have the O'Reilly book - Programming Sql Server 2005, but am not aware of any code examples that pertain to this problem. Let me know if you know of one.

Thanks for any assistance you might be able to provide :-)

Paul

More -

I had assumed a snapshot had been generated and it hasn't. The question of a code example of how to force invalidate a snapshot is still of interest to me though.

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I found it:

// If the pull subscription and the job exists, mark the subscription
// for reinitialization and start the agent job.
if (subscription.LoadProperties() && subscription.AgentJobId != null)
{
subscription.Reinitialize();
subscription.SynchronizeWithJob();
}