Single Sign on - Redirect to particular page

Hello All,
I have a single sign appliction implemeneted in asp.net. This appliction posts the SAML assertion to the vendor sso url and the vendor sso url will authenticate and redirects to the end user appliction.
What I want is that after the authentication at the sso url, the sso url should redirect to a particular page of the end user appliction.
Do I need to add/set any attribute in the SAML assertion before posting to the sso url.
Please let me know.