Sitecore MVC EditFrame implementation

SitecoreMvcEditFrame.cs

using Sitecore.Mvc.Helpers;
using Sitecore.Web.UI.WebControls;
using System;
using System.IO;
using System.Web.UI;

public static class SitecoreHelperExtensions
{
    /// <summary>
    /// Creates a scoped EditFrame
    /// </summary>
    /// <example>
    /// <code>
    /// <![CDATA[
    /// @using (Html.Sitecore().EditFrame("id", "/sitecore/content/Applications/WebEdit/Edit Frame Buttons/Default"))
    /// {
    ///   <p>This is rendered inside the frame</p>
    /// }
    /// ]]>
    /// </code>
    /// </example>
    /// <param name="htmlHelper">The SitecoreHelper instance</param>
    /// <param name="id">The ID of the EditFrame</param>
    /// <param name="buttons">A path to the buttons to use for the EditFrame</param>
    /// <returns>An IDisposable that will render the end of the frame when disposed</returns>
    public static MvcEditFrame BeginEditFrame(this SitecoreHelper htmlHelper, string id, string buttons)
    {
        return new MvcEditFrame(new EditFrame
        {
            ID = id,
            Buttons = buttons
        }, Sitecore.Mvc.Presentation.PageContext.Current.HtmlHelper.ViewContext.Writer);
    }
}

public class MvcEditFrame : IDisposable
{
    readonly TextWriter textWriter;
    readonly EditFrame editFrame;

    bool disposed;        

    public MvcEditFrame(EditFrame editFrame, TextWriter textWriter)
    {
        this.textWriter = textWriter;
        this.editFrame = editFrame;

        Render(editFrame.RenderFirstPart);
    }

    public void Dispose()
    {
        this.Dispose(true);
        GC.SuppressFinalize(this);
    }

    protected virtual void Dispose(bool disposing)
    {
        if (!this.disposed)
        {
            this.disposed = true;

            Render(editFrame.RenderLastPart);
        }
    }

    private void Render(Action<HtmlTextWriter> renderer)
    {
        using (StringWriter sw = new StringWriter())
        using (HtmlTextWriter htmlWriter = new HtmlTextWriter(sw))
        {
            renderer(htmlWriter);

            this.textWriter.Write(sw.ToString());
        }
    }

    public void EndFrame()
    {
        this.Dispose(true);
    }
}