Retrieving parameters from the query string in the URL in .Net

Here is a nice easy way to get the individual parameter values from the URL, returning either a NameValueCollection (System.Collections.Specialized.NameValueCollection HttpRequestBase.QueryString) of all parameters in the query string, or a string value of a particular named parameter.

var parameters = HttpContext.Request.QueryString;

var parameters = HttpContext.Current.Request.QueryString;

public class MyAttribute : ActionFilterAttribute
{
    public override void OnActionExecuting(ActionExecutingContext filterContext)
    {
        var

            
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