Create a Term Set and Terms in SharePoint 2010 Programatically

Created a Term Set in Managed Metadata Service Application then I can create a custom term set and terms using TaxonomyWebTaggingControl object is a Web control that can be added to a page so that a user can pick one or more taxonomy Term object from a specific TermSet object or from an entire TermStore object."

//add new term set into manage data
using (SPSite site = new SPSite(SPContext.Current.Site.Url))
{
       TaxonomySession _TaxonomySession = new TaxonomySession(site);

       //Get instance of the Term Store
       TermStore _TermStore = _TaxonomySession.TermStores[0];

       //Now create a new Term Group
       Group _Group = _TermStore.CreateGroup("MyGroup");

       //Create a new Term Set in the new Group
       TermSet _TermSet = _Group.CreateTermSet("MyTermset");

       //Add terms to the term set
       Term _term1 = _TermSet.CreateTerm("A Term", 1033);
       Term _term2 = _TermSet.CreateTerm("B Term", 1033);
       Term _term3 = _TermSet.CreateTerm("C Term", 1033);
       Term _term4 = _TermSet.CreateTerm("D Term", 1033);

       //commit changes
       TermStore.CommitAll();

}