How to perform (insert ,update,delete,cancel) in gridview

See this link. it will easy to understand.

http://www.c-sharpcorner.com/UploadFile/1e050f/insert-update-and-delete-record-in-datagridview-C-Sharp/

You can find simple articles here that surely will help you :

http://www.c-sharpcorner.com/UploadFile/009464/make-edit-update-and-delete-operation-in-gridview-in-Asp-Net/

https://www.codeproject.com/Articles/438259/Insert-Update-Search-and-Delete-CRUD-operation-usi

http://aspsolutionkirit.blogspot.in/2013/04/selectinsertupdatedelete-in-gridview.html