About cookies

Question

How to invoke cookies on pageload?

i wrote the code as

{

Httpcookies obj1=null, obj2= null;

obj1=response.cookies("username");

obj2=response.cookies("password");

if(obj1!="null" && obj2!="null")

{

   server.transfer("welcome.aspx");

} 

}

but this gives me error named 

non-invocable cookie., i.e cookie cannot be called as method...

error is in the line--obj1=response.cookies("username");

                            --obj1=response.cookies("username");

suggest me how to invoke that cookie as iam learning asp.net....