How to solve “New transaction is not allowed because there are other threads running in the session” in Entity Framework

Make sure only call SaveChanges method once in the end, not inside loop.
Or covert collection to IList

How to use Ajaxupload in MVC

Client side:
1. Get the latest lib from http://valums.com/ajax-upload
2. Copy into your project
3. Add refrence in your aspx file:
<script src='<%=Page.ResolveClientUrl("~/Scripts/ajaxupload.3.6.js")%>' type="text/javascript"></script>
4. Add Javascript code to call ajaxupload
<script type="text/javascript">
$(document).ready(function() {
var button = $('#upload')[0], interval;
new AjaxUpload(button, {
action: '<%= Url.Relative("~/ControllerName/Save") %>',
name: 'myfile',
onSubmit: function(file, ext) {
if (!(ext && /^(doc|pdf|txt|xls)$/.test(ext))) {
alert('Error: invalid file extension');
return false;
}
button.value = 'Uploading';
this.disable();
interval = window.setInterval(function() {
var text = button.value;
if (text.length < 13) {
button.value = button.value + '.';
} else {
button.value = 'Uploading';
}
}, 200);
},
onComplete: function(file, response) {
button.value = 'Upload';

window.clearInterval(interval);
this.enable();
if (response == 'error')
alert('Error: File size is over limit (10mb). '+file);
else
//Dispaly uploaded file
},
responseType:'json'
});
});
</script>

Server side is very simple. Just create a Json action:
public JsonResult Save()
{
try
{
var files = this.HttpContext.Request.Files;
string filename = System.IO.Path.GetFileName(files[0].FileName);
files[0].SaveAs(filename);
return Json(null);
}
catch
{
return Json("error");
}
}

Open source Microblog project, Yonkly

By ASP.NET MVC, but there is no update since Dec 11 2009
http://yonkly.codeplex.com/releases/view/37150

How to make ribbon style menu in ASP.NET webform project?

- Download and test demo from:
http://jqueryribbon.codeplex.com/
- Steps:
1. Add JQuery and ribob JavaScript references into master page

2. Add ribbon menu html tab into master page

If use JQuery 1.4.2, you will get following error (http://jqueryribbon.codeplex.com/workitem/26828):
$(".ribbon-list div ul:visible").parent().offset() is null
Please use following script to replace jquery.ribbon.js.

///<reference path="jquery-1.3.2-vsdoc2.js" />
/*
Copyright (c) 2009 Mikael Söderström.
Contact: vimpyboy@msn.com
 
Feel free to use this script as long as you don't remove this comment.
*/
 
(function ($) {
    var isLoaded;
    var isClosed;
 
    $.fn.Ribbon = function (ribbonSettings) {
        var settings = $.extend({ theme: 'windows7' }, ribbonSettings || {});
 
        $('.ribbon a').each(function () {
            if ($(this).attr('accesskey')) {
                $(this).append('<div rel="accesskeyhelper" style="display: none; position: absolute; background-image: url(images/accessbg.png); background-repeat: none; width: 16px; padding: 0px; text-align: center; height: 17px; line-height: 17px; top: ' + $(this).offset().top + 'px; left: ' + ($(this).offset().left + $(this).width() - 15) + 'px;">' + $(this).attr('accesskey') + '</div>');
            }
        });
        $('head').append('<link href="/ribbon/themes/' + settings.theme + '/ribbon.css" rel="stylesheet" type="text/css" />');
 
        if (!isLoaded) {
            SetupMenu(settings);
        }
 
        $(document).keydown(function (e) { ShowAccessKeys(e); });
        $(document).keyup(function (e) { HideAccessKeys(e); });
 
        function SetupMenu(settings) {
            $('.menu li a:first').addClass('active');
            $('.menu li ul').hide();
            $('.menu li a:first').parent().children('ul:first').show();
            $('.menu li a:first').parent().children('ul:first').addClass('submenu');
            $('.menu li > a').click(function () { ShowSubMenu(this); });
            $('.orb').click(function () { ShowMenu(); });
            $('.orb ul').hide();
            $('.orb ul ul').hide();
            $('.orb li ul li ul').show();
            $('.orb li li ul').each(function () { $(this).prepend('<div style="background-color: #EBF2F7; height: 25px; line-height: 25px; width: 292px; padding-left: 9px; border-bottom: 1px solid #CFDBEB;">' + $(this).parent().children('a:first').text() + '</div>'); });
            $('.orb li li a').each(function () { if ($(this).parent().children('ul').length > 0) { $(this).addClass('arrow') } });
 
            //$('.ribbon-list div').each(function() { $(this).parent().width($(this).parent().width()); });
 
            $('.ribbon-list div').parents().click(function (e) {
                var inX = true;
                if ($('.ribbon-list div ul').has(':visible').length > 0) {
                    var p = $('.ribbon-list div ul').has(':visible').parent();
                    var outsideX = e.pageX < p.offset().left || e.pageX > p.offset().left + p.width();
                    var outsideY = e.pageY < p.offset().top || e.pageY > p.offset().top + p.height();
 
                    if (outsideX || outsideY)
                        inX = true;
                    else
                        inX = false;
 
                }
                if (inX) {
                    $('.ribbon-list div ul:visible').each(function () {
                        $(this).fadeOut('fast');
                    });
                    $('.ribbon-list div').css('background-image', '');
                }
            });
 
            $('.ribbon-list div').parents().click(function (e) {
                var $ulParent = $('.ribbon-list div ul:visible').parent();
                if ($ulParent.length) {
                    var outsideX = e.pageX < $ulParent.offset().left || e.pageX > $ulParent.offset().left + $ulParent.width(),
outsideY = e.pageY < $ulParent.offset().top || e.pageY > $ulParent.offset().top + $ulParent.height();
 
                    if (outsideX || outsideY) {
                        $('.ribbon-list div ul:visible').each(function () {
                            $(this).fadeOut('fast');
                        });
                        $('.ribbon-list div').css('background-image', '');
                    }
                }
            });
 
            $('.orb li li a').mouseover(function () { ShowOrbChildren(this); });
 
            $('.menu li > a').dblclick(function () {
                $('ul .submenu').animate({ height: "hide" });
                $('body').animate({ paddingTop: $(this).parent().parent().parent().parent().height() });
                isClosed = true;
            });
        }
 
        $('.ribbon').parents().click(function (e) {
            var outsideX = e.pageX < $('.orb ul:first').offset().left || e.pageX > $('.orb ul:first').offset().left + $('.orb ul:first').width();
            var outsideY = e.pageY < $('.orb ul:first img:first').offset().top || e.pageY > $('.orb ul:first').offset().top + $('.orb ul:first').height();
 
            if (outsideX || outsideY)
                $('.orb ul').fadeOut('fast');
        });
 
        if (isLoaded) {
            $('.orb li:first ul:first img:first').remove();
            $('.orb li:first ul:first img:last').remove();
            $('.ribbon-list div img[src*="/images/arrow_down.png"]').remove();
        }
 
        $('.orb li:first ul:first').prepend('<img src="ribbon/themes/' + settings.theme + '/images/menu_top.png" style="margin-left: -10px; margin-top: -22px;" />');
        $('.orb li:first ul:first').append('<img src="ribbon/themes/' + settings.theme + '/images/menu_bottom.png" style="margin-left: -10px; margin-bottom: -22px;" />');
 
        $('.ribbon-list div').each(function () { if ($(this).children('ul').length > 0) { $(this).append('<img src="ribbon/themes/' + settings.theme + '/images/arrow_down.png" style="float: right; margin-top: 5px;" />') } });
 
        //Hack for IE 7.
        if (navigator.appVersion.indexOf('MSIE 6.0') > -1 || navigator.appVersion.indexOf('MSIE 7.0') > -1) {
            $('ul.menu li li div').css('width', '90px');
            $('ul.menu').css('width', '500px');
            $('ul.menu').css('float', 'left');
            $('ul.menu .submenu li div.ribbon-list').css('width', '100px');
            $('ul.menu .submenu li div.ribbon-list div').css('width', '100px');
        }
 
        $('a[href=' + window.location.hash + ']').click();
 
        isLoaded = true;
 
        function ResetSubMenu() {
            $('.menu li a').removeClass('active');
            $('.menu ul').removeClass('submenu');
            $('.menu li ul').hide();
        }
 
        function ShowSubMenu(e) {
            var isActive = $(e).next().css('display') == 'block';
            ResetSubMenu();
 
            $(e).addClass('active');
            $(e).parent().children('ul:first').addClass('submenu');
 
            $(e).parent().children('ul:first').show();
            $('body').css('padding-top', '120px');
 
            isClosed = false;
        }
 
        function ShowOrbChildren(e) {
            if (($(e).parent().children('ul').css('display') == 'none' || $(e).parent().children('ul').length == 0) && $(e).parent().parent().parent().parent().hasClass('orb')) {
                $('.orb li li ul').fadeOut('fast');
                $(e).parent().children('ul').fadeIn('fast');
            }
        }
 
        function ShowMenu() {
            $('.orb ul').animate({ opacity: 'toggle' }, 'fast');
        }
 
        function ShowAccessKeys(e) {
            if (e.altKey) {
                $('div[rel="accesskeyhelper"]').each(function () { $(this).css('top', $(this).parent().offset().top).css('left', $(this).parent().offset().left - 20 + $(this).parent().width()); $(this).show(); });
            }
        }
 
        function HideAccessKeys(e) {
            $('div[rel="accesskeyhelper"]').hide();
        }
    }
})(jQuery);

If still do not show up, please double check following line, make sure themes files location is correct
        $('head').append('<link href="/ribbon/themes/' + settings.theme + '/ribbon.css" rel="stylesheet" type="text/css" />');

Free tool to Test the load time of a web page

pingdom