Bootstrap for ASP.NET MVC

Creating ASP.NET MVC Bootstrap Helpers
Creating self-closing helpers
Self-closing helpers are helpers that can contain HTML and Razor markup.
The built-in @Html.BeginForm() helper is an example of this type of helper.
In order to create this type of HTML helper, we'll need to create a helper class that
implements the IDisposable interface. Using the IDisposable interface, we can
write the element's closing tags when the object is disposed.
The Bootstrap Panel component is a perfect candidate for such a helper. To create
the helper, we'll have to complete the following steps:
1. Create a new subfolder called Panels inside the Helpers folder in
your project.
2. Open the Enums.cs ile, and add a new item called PanelStyle:
public enum PanelStyle
{
Default,
Primary,
Success,
Info,
Warning,
Danger
}
3. Add a new class ile called Panel.cs to the Panels folder.
4. Add a new private read-only ield to the class called _writer.
5. Create a constructor for the Panel class that accepts three parameters.
The irst is a reference to the HtmlHelper object, the second speciies the
title of the panel, and the third indicates the style of the panel.
6. Add the following code to the Panel class's constructor method:
public Panel(HtmlHelper helper, string title, Enums.PanelStyle
style = Enums.PanelStyle.Default)
{
_writer = helper.ViewContext.Writer;
var panelDiv = new TagBuilder("div");
panelDiv.AddCssClass("panel-" + style.ToString().ToLower());
panelDiv.AddCssClass("panel");
var panelHeadingDiv = new TagBuilder("div");
panelHeadingDiv.AddCssClass("panel-heading");
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