.NET Framework 4.6 and 4.5
protected virtual void OnStartup(
OnStartup raises the Startup event.
A type that derives from Application may override OnStartup. The overridden method must call OnStartup in the base class if the Startup event needs to be raised.
Supported in: 4.6, 4.5, 4, 3.5, 3.0
.NET Framework Client Profile
Supported in: 4, 3.5 SP1
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