How to get angle of rotation dynamically.

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C#

I have to change angles of an image by selecting one of the given value. The image is on one window. after right clicking window appears from which we can select angle EX.0d, 90d, 120d etc.

My problem is that my code changes the angle when i select particular option. but if i again right click the priviously checked option resets to zero. i want that it should not happen. the angle in which the image is should be reflected on selection window. I am using wpf application and rotatetransform.


Please help.