How to concat values in list<string>?

How to concat values of item and item1 in the list above :

public ActionResult Indexx()
      {
          using (db)
          {
              FieldInfo[] mytables =      db.GetType().GetFields(BindingFlags.Public |
                                     BindingFlags.NonPublic |
                                     BindingFlags.Instance);
 
              List<string> tbllistname = new List<string>();
              string[] proinfo = new string[] { " CREATE ", " READ  " , " EDIT  " , " DELETE  " };
 
 
              foreach (var item in mytables)
              {
                  foreach (var item1 in proinfo)
                  {
 
                      tbllistname.Add(item.Name.Split('<', '>')[1]); //CONCAT ITEM1
                      
                  }
                  
              }
              ViewBag.MyTables = tbllistname;
          }
          return View();
      }