将Webmatrix查询拆分为C#类

下面的代码显然不起作用。我不熟悉如何返回动态类型的变量

public class Db
{
   public static var GetUsers()
    {
        var db = Database.Open("Db");
        var sql = "SELECT FirstName FROM Users";
        return db.Query(sql)
    }
}

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使用动态关键字：

public static dynamic GetUsers()
{
    var db = Database.Open("Db");
    var sql = "SELECT FirstName FROM Users";
    return db.Query(sql)
}

---

使用动态关键字：

public static dynamic GetUsers()
{
    var db = Database.Open("Db");
    var sql = "SELECT FirstName FROM Users";
    return db.Query(sql)
}