The on start.
Assembly: CrawlerLib.Engine (in CrawlerLib.Engine.dll)
The async Callback.
The async state.
The IAsyncResult .
If OnStart has started an async operation it MUST return the async result. Don't execute code that may raise exceptions after you started an async operation. It is not possible to process that in the right manner.
Windows 8, Windows Server 2012, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see.
Supported in: 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0
.NET Framework Client Profile
Supported in: 4, 3.5 SP1
.NET Compact Framework
Supported in: 3.5, 2.0, 1.0
Supported in: 3.0, 2.0, 1.0