How to get parameter from url string in c#

use inbuilt HttpUtility Method ParseQueryString.

private NameValueCollection GetQueryParameters(string dataWithQuery)

{

   return  HttpUtility.ParseQueryString(dataWithQuery);

}

string LinkUrl = "http://www.sujoysantra.com?month=jan&day=sun";

NameValueCollection dtQueryString = GetQueryParameters(LinkUrl);

string month = dtQueryString["month"]; //jan