How do i do two consecutive WebRequest.GetResponse ?

[relikangus]

i'm new to c#

the following is my code:
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HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create("http://www.google.com");

HttpWebResponse myResponse = (HttpWebResponse)myRequest.GetResponse();
myResponse.Close();

myRequest = (HttpWebRequest)WebRequest.Create("http://www.mns.com");
myResponse = (HttpWebResponse)myRequest.GetResponse();
myResponse.Close();
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It works for the first site. i can read the contents of the myRequest object. But i get an error when i try to get the response of the second site.

so how do i get a request from 2 sites? (i'm planning to check for more)