What are Query Strings in the context of ASP.NET web pages?
In the context of ASP.NET web pages, query strings refer to the part of a URL that follows the question mark symbol "?" and contains additional parameters and values. These parameters are used to pass information between web pages or to retrieve specific data from a server.
Query strings are typically appended to the end of a URL and consist of one or more key-value pairs separated by ampersands (&). Each key-value pair is separated by an equals sign (=), where the key represents the name of the parameter, and the value represents the associated data.
For example, consider the following URL:
http://example.com/page.aspx?id=123&name=John
In this URL, the query string is '?id=123&name=John', where 'id' and 'name' are the parameters, and '123' and 'John' are the corresponding values. The values in the query string can be accessed and utilized by ASP.NET web pages to perform various tasks, such as retrieving data from a database based on the provided ID or customizing the content based on the provided name.
In ASP.NET, you can access the query string parameters using the 'Request.QueryString' collection, which provides a convenient way to retrieve and manipulate the values passed in the URL. For example, in C#, you can access the id parameter from the above URL using 'Request.QueryString["id"]'.
It's important to note that query string parameters are visible to users and can be modified, so sensitive information or critical operations should not be performed solely based on query string values.