Update Managed Metadata Field in SharePoint 2013

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The following example update a term store field that allow multiple values.

using (SPSite site = new SPSite("siteUrl"))
                {
                    using (SPWeb web = site.OpenWeb())
                    {
                        PublishingWeb pubWeb = PublishingWeb.GetPublishingWeb(web);
                        PublishingPageCollection pubPages = pubWeb.GetPublishingPages();
                        string metadata = String.Empty;
                        foreach (PublishingPage pubPage in pubPages)
                        {
                            SPListItem item = pubPage.ListItem;

                            if (item.File.CheckedOutByUser != null)
                                item.File.UndoCheckOut();

                            if (pubPage.Name.ToLower() == "test.aspx")
                            {
                                pubPage.CheckOut();
                                TaxonomyField oField = (TaxonomyField)item.Fields.GetFieldByInternalName("fieldInternalName");

                                 TaxonomyFieldValueCollection tagValues = new TaxonomyFieldValueCollection(oField);
                                string termString = String.Concat("Technology", TaxonomyField.TaxonomyGuidLabelDelimiter, "84cc2695-08d6-4f2e-a682-76218d313f19");
                             
                                TaxonomyFieldValue tagValue = new TaxonomyFieldValue(string.Empty);
                                tagValue.PopulateFromLabelGuidPair(termString);
                                tagValues.Add(tagValue);

                                 termString = String.Concat("End User Technology", TaxonomyField.TaxonomyGuidLabelDelimiter, "826dffdd-4ffb-43e4-88c2-ea86fa4363f5");
                                TaxonomyFieldValue tagValue2 = new TaxonomyFieldValue(string.Empty);
                                tagValue2.PopulateFromLabelGuidPair(termString);
                                tagValues.Add(tagValue2);

                                 oField.SetFieldValue(pubPage.ListItem, tagValues);
                                item.Update();
                                pubPage.CheckIn("checking in by tool");                              
                            }                          
                        }
                    }
                }

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