How to read data from QueryString in Asp.net

Let us assume,

A asp.net API is created as given

Http://www.abc.com?userid=username & pass=password

In these condition we need to read these values as shown below.

string userid = Request.QueryString["userid"].ToString();

string pass = Request.QueryString["pass"].ToString();

Now you can use userid and pass for any task(ie. login verification)