How to save the selected checkbox value in gridview to db?

Question

Good day~

I have a problem that cracked my head for a week! 
I have a GridView and checkboxes for every each row and a Save button. My GridView contains Serial Number, Type of Asset and Condition. I have 2 checkboxes for "Condition" which are Good or Damage. So, for example, i tick on the checkbox of Good for every each row and click save button. The problem comes! 

I DO NOT know how to save the value of checkbox(Good) that i have tick!!!

Can you help me on this? please~~~ Your help is appreciated!!! thank you so much