我有两个linq查询的结果怎么把他们合并在一起呢？字段都一样

Question

 using (DataClassesDataContext myData = new DataClassesDataContext())
            {
                var allSearch1 = from comcas in myData.CASInfo
                                where comcas.中文1.Contains(qname)
                           orderby comcas.中文别名.Length descending
                                select comcas;
                var allSearch2 = from comcas2 in myData.CASInfo
                                where comcas2.中文2.Contains(qname)
                               orderby comcas2.中文别名.Length descending
                                select comcas2;

// 怎么把allSearch1 和allSearch2 合并到 linq的allSearch中，顺序是先allSearch1的后allSearch2的
//allSearch=allSearch1+allSearch2; 这个意思

            }

 var allSearch = allSearch1.Union(allSearch2);

如果语句中包含 UNION 运算符，那么 ORDER BY 子句中的项就必须出现在选择列表中。
如果语句中包含 UNION 运算符，那么 ORDER BY 子句中的项就必须出现在选择列表中。

怎么办？请大家指教

Answer 1

var allSearch3 = allSearch1.ToList().AddRange(allSearch2.ToList())?

Answer 2

报错了：无法将“void”赋值给隐式类型的局部变量
怎么办？

Answer 3

能否详细点：最后的数据希望可以直接：
 List allSearch = allSearch1.ToList().AddRange(allSearch2.ToList());

报错了：无法将“void”赋值给隐式类型的局部变量
怎么办？

 GridView1.DataSource = allSearch;
                GridView1.DataBind();

Answer 4

      DataClasses1DataContext da = new DataClasses1DataContext();
            var l1 = (from s in da.linqname
                      orderby s.names.Length descending
                      select s).ToList();
            var l2 = (from s in da.linqname
                     orderby s.names.Length descending
                     select s).ToList();
          var ll=  l1.Concat(l2);

            foreach (var l in ll)
            {
                Console.Write(l.names+"\n");
            }

 

Answer 5

十分感谢：）再次感谢