EPiServer 6

EPiServer

/// <summary>
  		/// </summary>
			/// <param name="pageReference"></param>
			/// <param name="isInEditMode"></param>
			/// <returns></returns>
			public static IEnumerable<PageData> GetChildren(PageReference pageReference, bool isInEditMode)
			{
				IEnumerable<PageData> pages = null;

				try
				{
					var helper = new EpiPageHelper();

					if (isInEditMode)
					{
						// Get all unpublished child pages
						var missingDataPages = DataFactory.Instance.GetChildren(pageReference, LanguageSelector.AutoDetect(true));

						// As EPI has a missing meta-data bug we need to get all data before anythign else
						var editorPages = missingDataPages.Select(x => helper.GetLastestVersion(x.PageLink));
						pages = editorPages.Where(item => item.VisibleInMenu && helper.HasAccess(item));
					}
					else
					{
						pages = GetPublicPages(pageReference);
					}
				}
				catch (Exception ex)
				{
					Logger.Error(ex);
				}

				return pages;
			}

EPiServer Getting a Page from an Id

var pageId = 1;  
var pageRef = new PageReference(pageId );  
var page = DataFactory.Instance.GetPage(pageRef) as PageType;