Symptoms
Consider the following scenario. You develop a SQL Server 2005-based application. The application uses the SQL Server Management Objects (SMO) DLLs that are included in SQL Server 2005 Service Pack 1. The application calls the Server.JobServer.Jobs.Contains method to determine whether a specified job exists in the job collection. When you run the application on a computer that has SQL Server 2005 Service Pack 2 (SP2) installed, you receive a System.InvalidCastException exception.
Resolution
The fix for this issue was first released in Cumulative Update. For more information about how to obtain this cumulative update package for SQL Server 2005 Service Pack 2, click the following article number to view the article in the Microsoft Knowledge Base:
939537?(http://support.microsoft.com/kb/939537/LN/) Cumulative update packagefor SQL Server 2005 Service Pack 2Note Because the builds are cumulative, each new fix release contains all the hotfixes and all the security fixes that were included with the previous SQL Server 2005 fix release. Microsoft recommends that you consider applying the most recent fix release that contains this hotfix. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
937137?(http://support.microsoft.com/kb/937137/LN/) The SQL Server 2005 builds that were released after SQL Server 2005 Service Pack 2 was releasedMicrosoft SQL Server 2005 hotfixes are created for specific SQL Server service packs. You must apply a SQL Server 2005 Service Pack 2 hotfix to an installation of SQL Server 2005 Service Pack 2. By default, any hotfix that is provided in a SQL Server service pack is included in the next SQL Server service pack.