Insert Edit Update and Delete in GridView without using DataSource controls in ASP.Net

Here Mudassar Ahmed Khan has explained with an example, how to perform Insert Edit Update and Delete in GridView without using DataSource controls in ASP.Net with C# and VB.Net. Without DataSource controls means, not using the ASP.Net DataSource controls such as SqlDataSource, ObjectDataSource, XmlDataSource, etc. for performing Insert Edit Update and Delete in GridView control.