Add/Move ListItems to a folder in SharePoint List, adding folders if needed

///  Adding Items under folder in List

SPList oList = web.Lists["ListName"];
     
SPListItemCollection items = oList.Items;

SPListItem item = items.Add("/sites/[webname]/Lists/[ListName]/[FolderName]",                                
                                             SPFileSystemObjectType.File);

                item["Title"] = "Something";
               item.Update();



/////    Moving Listitems to different folder in same list

SPListItemCollection items = oList.Items;

foreach (SPListItem item in items)
                    {                      
                        SPFile file = web.GetFile(item.Url.ToString());
                   
  file.MoveTo(string.Format("Lists/[ListName]/{0}/{1}_.000", "FolderName", item["ID"].ToString()));

                        item.Update();
                                           
                    }



///    Creating Folders if needed


oFolder = oList.Items.Add(oList.RootFolder.ServerRelativeUrl, SPFileSystemObjectType.Folder, FolderName);
                      newFolder.Update();
                      oList.Update();

Viewfields in SPQuery

http://www.sharepoint-guru.com/2012/12/how-important-is-viewfields-in-spquery.html

SharePoint Best practises

http://msdn.microsoft.com/en-us/library/ee557257.aspx

no offense meant!

Hilarious comment at the bottom, that was just going around in my head.