The for attribute takes the name of the PageModel property that represents the selected value, or values. The select tag helper has two attributes: for and items. If you are interested in learning how to use the HTML helpers, check the 'Further Reading' section at the end. This guide will only focus on the tag helper. Razor offers two ways to generate select lists: the select tag helper and the DropDownList (and DropDownListFor) Html Helpers, which are artefacts inherited from pre-ASP.NET Core versions of the MVC framework. posted value is assigned to the Number property automatically The recommended approach, however is to add a suitable property to the PageModel and to allow model binding to apply the posted value to the property: public IndexModel : PageModel You can access the value by passing the key as an indexer to the Request.Form collection: var number = Request.Form This is used as the key for any selected value(s) when a form is submitted. The following example is used to illustrate the main features of these two HTML elements: They are rendered in HTML as a select element, which acts as a container for a number of option elements, each representing an available choice. Select lists or DropDown lists are used in a Razor Pages form to enable users to select zero or more predefined options. Managing Security With ASP.NET Identity.

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