location attendance

Job ID: 34161260

Budget: $30 – $250 USD

I'm having a problem with my website.
I want to add the feature of attendance employees through the geographical location of the company, when an employee arrives particular place inside the company the button or check button is activated. I tried to do that by using Google Map API (Geocoding) but I failed.
Is there another easier API or application to determine the location?
How can I integrate that with my code? Note that I'm using asp.net webforms vb coding.