what is place holder in ASP.NET with example.

PlaceHolder control:
 
The PlaceHolder control is used to reserve space for controls added by code use to PlaceHolder control  and show at run time.It does not produce any visible output.

Properties:

runat     Specifies that the control is a server control. Must be set to "server"

Example:

Source file:Home.aspx

home.aspx.cs file :

 Output

 Before PlaceHolder

 After PlaceHolder