We have a .NET service to communicate with SF. The .NET service logs in to SF once using a valid user, and after that all API calls to SalesFroce.com uses that user session ID.

The problem is: how can we tell when the session of this user was expired and he needs to re-login? currently it is done by catching exception, but this is probably not the  best way to do it.

Thanks

i m new to salesforce.

using this to select

but i cnnt know

How to get the value in veriable what tolabel(Recordtype.Name) returns