SharePoint Update Manage Metadata Column

	public static void SetManagedMetaDataField(string siteUrl,
	string listName,
	string itemID,
	string fieldName,
	string term)
	{
	ClientContext clientContext = new ClientContext(siteUrl);
	List list = clientContext.Web.Lists.GetByTitle(listName);
	FieldCollection fields = list.Fields;
	Field field = fields.GetByInternalNameOrTitle(fieldName);
	CamlQuery camlQueryForItem = new CamlQuery();
	string queryXml = @"<view>
	<query>
	<where>
	<eq>
	<fieldref name="ID">
	<value type="Counter">!@itemid</value>
	</fieldref></eq>
	</where>
	</query>
	</view>";
	camlQueryForItem.ViewXml = queryXml.Replace("!@itemid", itemID);
	ListItemCollection listItems = list.GetItems(camlQueryForItem);
	clientContext.Load(listItems, items =>; items.Include(i =>; i[fieldName]));
	clientContext.Load(fields);
	clientContext.Load(field);
	clientContext.ExecuteQuery();
	TaxonomyField txField = clientContext.CastTo<taxonomyfield>(field);
	string termId = GetTermIdForTerm(term, txField.TermSetId, clientContext);
	ListItem item = listItems[0];
	TaxonomyFieldValueCollection termValues = null;
	TaxonomyFieldValue termValue = null;
	string termValueString = string.Empty;
	if (txField.AllowMultipleValues)
	{
	termValues = item[fieldName] as TaxonomyFieldValueCollection;
	foreach (TaxonomyFieldValue tv in termValues)
	{
	termValueString += tv.WssId + ";#" + tv.Label + "|" + tv.TermGuid + ";#";
	}
	termValueString += "-1;#" + term + "|" + termId;
	termValues = new TaxonomyFieldValueCollection(clientContext, termValueString, txField);
	txField.SetFieldValueByValueCollection(item,termValues);
	}
	else
	{
	termValue = new TaxonomyFieldValue();
	termValue.Label = term;
	termValue.TermGuid = termId;
	termValue.WssId = -1;
	txField.SetFieldValueByValue(item, termValue);
	}
	item.Update();
	clientContext.Load(item);
	clientContext.ExecuteQuery();
	}

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