how to use querystring in asp.net.
ASP.NET QueryString A query string is a collection of characters input to a computer or web browser. A Query String is helpful when we want to transfer a value from one page to another.
On the internet, a Query string is the part of a link (otherwise known as a hyperlink or a uniform resource locator, URL for short) which assigns values to specified attributes (known as keys or parameters). Typical link containing a query string is as follows: http://example.com/over/there?
A query string commonly includes fields added to a base URL by a Web browser or other client application, for example as part of an HTML, choosing the appearance of a page, or jumping to positions in multimedia content.
It depends on what exactly query.string did in the language you refer to, but...
Request.QueryString["MyValue"];
http://msdn.microsoft.com/en-us/library/system.web.httprequest.querystring.aspx
Good article realted to query string
ASP.NET Client Side State Management - Query Strings
Passing variables between pages using QueryString
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