How to differentiate among many previous pages in ASP.net

See more:

C#2.0

C#

ASP.NET

Hi every body,

I have problem that,
in my web project that i can go to specific page from many page.
I want to know what is the name of the previous page when i go to the specific page

Because i have certain code inside the specific page that i want to execute only when the previous page is home page.

I want to write code like that:

if (PreviousPage == "HomePage.aspx")
        {
            // certain code goes here
        }
        else if(PreviousPage == "SpecificPage.aspx")
        {
            // certain code goes here
        }

I hope you help me please like every time ;)
Thanks