Get BoundField and TemplateField column values on Button Click in ASP.Net GridView

Here Mudassar Ahmed Khan has explained with an example, how to get BoundField and TemplateField column values on Button Click in ASP.Net GridView using C# and VB.Net. When the Button is clicked, the Selected GridView Row is referenced and then the values of the BoundField and TemplateField columns are extracted from it in ASP.Net using C# and VB.Net.