How to chage user controls at runtime?

Question

Hi, In my webform controls like this

 

Checkbox 1:yes   and checkbox2 :No

Name: TextBox

FirstName:TextBox

LastName: TextBox

State: ComboBox

 

If I click yes ,The Controls changes like this(same page)

 

Name:comboxBox

FirstName:TextBox

LastName:ComboxBox

State:TextBox