如何编辑/删除网格视图中没有数据键ASP.NET的行

I am using asp.net grid view to display data from an excel sheet. I can also add the data to this excel sheet using the grid view. The problem I am facing is in editing/updating and deleting records from the gridview/excel. When I update one row it updates every rows.I am using asp.net grid view to display data fr