hi all, thanks for giving suggestions.

At last i got the solution, the problem is in application side. developers add some

enchancements in coding and also issues in server side

In SQL server 2005,.net 2003 applications (.net framework 2.0 )are running on windows 2003 platform,

applications developed in .net 2008 can't be run on same server becoz this version requires .net frame work 3.5 to run the applications and .net 2003 appilcations requires .net 2.0 frame work. so here i found compatability issues in server..

thanks,

kumar.