How to create selector based custom activity

How to create selector based custom activity and need guidance for c# code for creating custom activity on get text

Hi!

Open studio->UiExplorer from there you can create the custom selectors. copy the selector which you get it from the first indicate on screen and copy the entire selector and paste it in a notepad. now you can generate the custom selector from the UiExplorer

Regards,
NaNi