Display Sublevel menus for Global Navigation in Sharepoint 2010

To display the Sub level menus as one shown below
 
Follow these below steps.

Open the site in Sharepoint Designer 2010

1. Open your Master page for the portal say "v4.master" or "v4_Custom.master" (in case you have a custom master page created for your site)
2. Find for the keyword "Orientation" 
3.  
4. Edit the values for "StaticDisplayLevels" and "MaximumDynamicDisplayLevels" as per your requirement. Initial value for "MaximumDynamicDisplayLevels" would be 1 and you can change it to 2 for the menu to appear as  shown in the above image

Display BreadCrumbs for Sharepoint 2010 sites

If you want the breadcrumb to appear in proper way, that shows the root site followed by subsite and so on, you can add the below line of codes in your master pagewhich the site is referring to.

    <asp:ContentPlaceHolder id="PlaceHolderSiteName" runat="server">
                                            <asp:sitemappath runat="server" sitemapproviders="SPSiteMapProvider,SPXmlContentMapProvider" rendercurrentnodeaslink="true" nodestyle-cssclass="breadcrumbNode" currentnodestyle-cssclass="breadcrumbCurrentNode" rootnodestyle-cssclass="breadcrumbRootNode" hideinteriorrootnodes="true">
</asp:sitemappath>                                   
                                            </asp:ContentPlaceHolder>

SharePoint 2010: Show QuickLaunch in web part page.

1.   Remove this place holder from webpart page

< asp:Content ContentPlaceHolderId="PlaceHolderNavSpacer" runat="server"></asp:Content>

< asp:Content ContentPlaceHolderId="PlaceHolderLeftNavBar" runat="server"></asp:Content>

2 Remove below code from web part page


<SharePoint:UIVersionedContent ID="WebPartPageHideQLStyles" UIVersion="4" runat="server">
<ContentTemplate>
<style type="text/css">
body #s4-leftpanel {
display:none;
}
.s4-ca {
margin-left:0px;
}
</style>
</ContentTemplate>
</SharePoint:UIVersionedContent>

Programmatically applying themes

//Open site collection object
using (SPSite mySite = new SPSite("http://SiteUrl"))
{

// Open site
using (SPWeb oWeb= mySite .OpenWeb())
{
oWeb.ApplyTheme("<theme to be applied>");
oWeb.Update();
}
}

Programmtically list all attachements in a List

public void fnListAttachments(string site, string listName)
{
    StringBuilder strAttachNames= new StringBuilder();
    using (SPSite oSite = new SPSite(site))
    {
        using (SPWeb oWeb = oSite.OpenWeb())
        {
            SPList oList = oWeb.Lists[listName];

            SPListItemCollection oListItems = oList.Items;
            foreach (SPListItem item in oListItems)
            {
                SPAttachmentCollection attachmentscol= item.Attachments;

                if (attachmentscol.Count <= 0) return string.Empty;

                foreach (var attachment in attachmentscol)
                {
                    strAttachNames.Append(attachment.ToString());
                }
            }
        }
    }
    //return strAttachNames.ToString();
}