Add Please Select option in ComboBox in Windows Forms Application using C# and VB.Net

Here Mudassar Ahmed Khan has explained with an example, how to add (insert) Please Select Option (Item) in ComboBox (DropDownList) in Windows Forms Application using C# and VB.Net. First a DataTable will be populated from database and then the Please Select Option (Item) will be added to it, finally the ComboBox will be populated from DataTable in Windows Forms Application using C# and VB.Net.