protected void btnUploadTermSet_Click(object sender, EventArgs e)
{
// Update Term set drop down for the taxonomy field creation.
var spContext = SharePointContextProvider.Current.GetSharePointContext(Context);
using (var ctx = spContext.CreateUserClientContextForSPHost())
{
TaxonomySession taxonomySession = TaxonomySession.GetTaxonomySession(ctx);
TermStore termStore = taxonomySession.GetDefaultSiteCollectionTermStore();
TermGroup group = termStore.GetGroup(new Guid(drpGroups.SelectedValue));
group.ImportTermSet(Server.MapPath("~/Resources/ImportTermSet.csv"),
termSetId: SampleTermSetId, synchroniseDeletions: true);
}
// Update term setup drop down
UpdateTermSetsBasedOnSelectedGroup(drpGroups.SelectedValue);
}