Controlling Stepper Motor with Raspberry Pi 3 and Win 10 IoT

I  am working on a project which requires operating bipolar stepper motor with Raspberry Pi 3 and Windows 10 IoT core. I am writing the program in C#. 

 

Currently, I am getting the pulses on the motor and it is producing little movement, but I am not getting a full revolution from the motor. I am using L298n motor shield as a motor driver.

I have attached the source code. I want to know if there is any issue with my code or is there any extra thing I need to do to get a complete revolution from the stepper motor.

 

Your help will be apprecciated.