Fetch the list of all the sitecollection and subsites under the webapplication and create a sharepoint menu

public class _starter : MasterPage
    {
        protected Menu CustomMenu;

        protected void Page_Load(object sender, EventArgs e)
        {
            using (SPSite site = new SPSite(SPContext.Current.Site.Url))
            {
                SPWebApplication webapp = site.WebApplication;
                CustomMenu.Items.Clear();
                BeginProcess(webapp);
            }
        }

        public void BeginProcess(SPWebApplication webApp)
        {
            //Execute any logic you need to against the web application
            //Iterate through each site collection
            foreach (SPSite site in webApp.Sites)
            {
                using (SPWeb oSPWeb = site.OpenWeb())
                {
                    MenuItem parentMenuItem = new MenuItem(oSPWeb.Title, oSPWeb.Title, "", oSPWeb.Url);
                    CustomMenu.Items.Add(parentMenuItem);
                    if (oSPWeb.Webs.Count > 0)
                    {
                        RecursiveWebCheck(oSPWeb, parentMenuItem);
                    }
                }
            }
        }

        private void RecursiveWebCheck(SPWeb parentoSPWeb, MenuItem parentMenuItem)
        {
            foreach (SPWeb web in parentoSPWeb.Webs)
            {
                //web.Dispose();
                //if (parentoSPWeb.Webs.Count > 0)
                //{
                MenuItem childMenuItem = new MenuItem(web.Title, web.Title, "", web.Url);
                parentMenuItem.ChildItems.Add(childMenuItem);
                RecursiveWebCheck(web, childMenuItem);
                //}
                web.Dispose();
            }
        }
    }

Set Master page when new sub site is created

Step 1:
Create Master page using following URL
http://msdn.microsoft.com/en-us/library/gg447066.aspx

Step 2:
Create Event receiver(right click -> Add New Item-> Event Receiver)

Step 3:
Choose Web events as Event Receiver type
and select "A Site was provisioned"

Step 4:

    public override void WebProvisioned(SPWebEventProperties properties)

        {

            SPWeb topLevelSite = properties.Web;

            string WebAppRelativePath = topLevelSite.Url;

            if (!WebAppRelativePath.EndsWith("/"))

            {

                WebAppRelativePath += "/";

            }

            topLevelSite.MasterUrl = WebAppRelativePath +

                                          "_catalogs/masterpage/Muthuvel2SpCustomMaster.master";

            topLevelSite.CustomMasterUrl = WebAppRelativePath +

                                   "_catalogs/masterpage/Muthuvel2SpCustomMaster.master";

            topLevelSite.UIVersion = 4;

            topLevelSite.Update();

      }

Step 5:

Deploy the application.

Step 6:

Go the the application and create new site. The master page applied for the newly created site.

REF URL: http://www.sharepointkings.com/2012/04/implement-sharepoint-2010-site-event.html

CSS and JS reference or registration in sharepoint

http://www.ashokraja.me/post/Refer-Scripts-and-CSS-Style-Sheet-in-SharePoint-2013-Visual-Web-Part-and-Master-Page.aspx

Sharepoint mega menu

Sample URL: http://www.ramto.com/blog/post/Mega-Dropdown-Menu-with-ASPNET-and-jQuery-in-C.aspx.

UI:
Add CSS and JS
<link href="/_layouts/Muthuvel2SP/CSS/jkmegamenu.css" type="text/css" rel="stylesheet" />
<script src="/_layouts/Muthuvel2SP/JS/jkmegamenu.js" type="text/javascript"></script>

Add 2 literal Control

<asp:Literal ID="anchorLiteral" runat="server"></asp:Literal>
<asp:Literal ID="menuLiteral" runat="server"></asp:Literal>


Add OnDataBound="Menu1_DataBound" event in the menu control

Master Page Code behind File:

protected void Menu1_DataBound(object sender, EventArgs e)
        {
            //hide the asp menu
            demoGlobalNavAspMenu.Visible = false;

            //holds html anchors
            anchorLiteral.Text = "";

            //holds html mega dropdown menu
            menuLiteral.Text = "";

            //register megamenu script and create anchor foreach top level

            StringBuilder mScript = new StringBuilder();
            StringBuilder anchorText = new StringBuilder();
            StringBuilder menuText = new StringBuilder();

            mScript.AppendLine(@"<script type='text/javascript'>");
            int cntLvl1 = 0;

            foreach (MenuItem lvl1 in demoGlobalNavAspMenu.Items)
            {
                cntLvl1++;
                string anchorId = "megaanchor" + cntLvl1.ToString();
                string megamenuId = "megamenu" + cntLvl1.ToString();

                //anchor for each top level menu
                anchorText.AppendLine("<a href='" + lvl1.NavigateUrl + "' id='" +
                    anchorId + "' class='topMenuCMSListMenuLinkHighlighted'>" +
                    lvl1.Text + "</a>");

                //building mega menu div if menuitem has children
                if (lvl1.ChildItems.Count > 0)
                {
                    int cntLvl2 = 0;
                    //script for each top level menu
                    mScript.Append(@"jkmegamenu.definemenu('" + anchorId + "', '" +
                        megamenuId + "', 'mouseover');");

                    menuText.AppendLine("<div id='" + megamenuId + "' class=megamenu>");

                    //building columns within the mega menu
                    foreach (MenuItem lvl2 in lvl1.ChildItems)
                    {
                        cntLvl2++;
                        menuText.AppendLine("<div class='column'>");
                        menuText.AppendLine("<h3><a href='" + lvl2.NavigateUrl + "'>" +
                            lvl2.Text + "</a></h3>");

                        //create ul list if any children
                        if (lvl2.ChildItems.Count > 0)
                        {
                            menuText.AppendLine("<ul>");
                            foreach (MenuItem lvl3 in lvl2.ChildItems)
                            {
                                menuText.AppendLine("<li><a href='" + lvl3.NavigateUrl + "'>" +
                                    lvl3.Text + "</a></li>");
                            }
                            menuText.AppendLine("</ul>");
                        }

                        menuText.AppendLine("</div>");

                        //break after 2 columns
                        //if (cntLvl2 >= 2)
                        //{
                        //    menuText.AppendLine("<br style='clear: left' />");
                        //    cntLvl2 = 0;
                        //}
                    }
                    menuText.AppendLine("</div>");
                }
            }

            anchorText.AppendLine("</ul>");

            anchorLiteral.Text = anchorText.ToString();
            menuLiteral.Text = menuText.ToString();
            mScript.AppendLine(@"</script>");
            Guid gid = System.Guid.NewGuid();

            Page.ClientScript.RegisterStartupScript(this.GetType(), gid.ToString(), mScript.ToString());
        }

Add JQUERY Accordion Panel in Quick Lunch

<script type="text/javascript" src="latest Jquery js file"></script>

<script type="text/javascript">

jQuery(function($) {

    $('.s4-ql li ul').hide();

    $('.s4-ql ul li').hover(function() {

        $(this).find('a:first').next().slideToggle();

    }, function() {

        $(this).find('a:first').next().slideToggle();

    }).find('ul').each(function(index) {

        var $this = $(this);

        $this.parent().find('a:first .menu-item-text').append(['<span style=\'float:right;font-size:0.8em;\'>(', $this.children().length, ')</span>'].join(''));

    });

});

</script>




http://www.lifeinsharepoint.co.uk/2011/12/15/quick-tip-jquery-accordion-quick-launch/