DropDownList RadioButtonList CheckBox CheckBoxList in GridView Edit Mode in Asp.Net

Most of the Asp.net (C# or VB.Net) developers faced a problem when they want to implement edit functionality within a GridView. The problem was developers can not understand how to populate DropDownList RadioButtonList CheckBox CheckBoxList in GridView Edit Mode. The another problem is after populating how to display or show current database value by default in DropDownList RadioButtonList