Windows Application C#

Update Data in Data Grid
https://khanrahim.wordpress.com/2010/04/10/insert-update-delete-with-datagridview-control-in-c-windows-application/

Limit entry of only digits in a DataGridView column

http://www.codeproject.com/Questions/260115/Limit-entry-of-only-digits-in-a-DataGridView-colum