获取对象类型并相应地分配值

我有一个数组列表不同类型的值其中，第一个值->string,第二个值->datetime, 第三个值-->boolean第四个值是int，我如何找到它们的类型并相应地分配值，任何帮助将不胜感激:)

这是我的代码：

foreach (object obj in lstTop)
            {

              if(obj.GetType() == string)
                {do this...)
              else if(obj.GetType() == DateTime)
                {do this....}
              else if(obj.GetType() == bool)
                {do this....}
              else if(obj.GetType() == Int)
                {do this....}
            }

谢谢你们，我的最终代码：

string Subscription = "";
        DateTime issueFirst;
        DateTime issueEnd;

        foreach (object obj in lstTop)
        {
            ///Type t = obj.GetType();
            if (obj is string)
                Subscription += obj + ",";
            else if (obj is DateTime)
            {
               Subscription += Convert.ToDateTime(obj).ToShortDateString() + ",";
            }
           /// else if (t == typeof(DateTime))                
        }
    return ("User Authenticated user name: " + userName + ", Subscription: " + Subscription);

foreach (object obj in lstTop)
        {

          if(obj is string)
            {do this.....}
          else if(obj is DateTime)
            {do this.....}
          else if(obj is bool)
            {do this.....}
          else if(obj is Int)
            {do this.....}
          else
          {
              // always have an else in case it falls through
              throw new Exception();
          }
        }