Regarding streaming of images in flycapture

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C#5.0

I have got sample code for flycapture camera through spinnaker or sample program given in flycapture2 SDK. Through spinnaker code is in wpf and work directly through library(GuiFactory), and in flycaptture2 sdk code is through background worker.I need a program to work directly without any background worker in c#.net or without any built-in library in spinnaker. Please help me in this regard.

What I have tried:

I have succeded to capture image both trough external trigger and software trigger. But for external trigger I have to click START-button each time. But I want to save images without clicking START button. How can I achieve this