Umbraco publish all content

private HttpContext _context;

public void ProcessRequest(HttpContext context)
{
    _context = context;

    context.Response.ContentType = "text/plain";
    context.Response.Buffer = false;        

    foreach (var d in Document.GetRootDocuments())
    {
        IndexCmsNode(d, true);
    }                        

    context.Response.Write("Done.");
}

void IndexCmsNode(CMSNode d, bool root = false)
{        
    // republish the document as you normally would

    _context.Response.Write("Published: " + d.Id + "\r\n");

    if (root)
    {
        foreach (CMSNode c in d.GetDescendants())
        {
            IndexCmsNode(c);
        }
    }
}