System.Web.HttpRequest.QueryString cannot be used like a method

Compilation Error Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately. Compiler Error Message: CS1955: Non-invocable member 'System.Web.HttpRequest.QueryString' cannot be used like a method. Source Error: Line 19: Line 20: Line 21:         string imageUrl = Request.QueryString("img"); Line 22: Line 23:         int imageHeight = Request.QueryString("h");