How to i close previous form when i nevigate to another form

See more:

.NET3.5

C#

.NET

hi
Scenario:
i need to jump from form1 to form 2, form 2 to form 3.
and on previous click form 3 to form 1

What i did:
i create form2 new object on form 1 like

form2 objFrm2 = new form2;
this.hide()
objFrm2.show()

then form3 object on form2

and finally i need to move to from 1 so i create

form1 objFrm1 = new form1;
this.hide()
objFrm1.show()

What is problem:
code run fine. but each time i need to create new object of forms.
now finally i moved to form1 means my form2,form3 are hidden always

so how to overcome it ?

how can i close form, once navigate to another form

i will be grateful for solutions/suggestions