ArrayList尝试访问一个索引的次数过多

我在下面的代码中遇到了一个错误，因为我的计数器将自己增加了1倍，我不明白为什么。

代码：

...private static int counter = 0;
protected void ButtonSubmit_Click(object sender, EventArgs e)
        {
            SendWord();
            object o = wordList[counter];
            LabelWord.Text = o.ToString();
            if (counter < wordList.Count)
            {
                counter++;
            }
         }

如果我使用counter < wordList.Count -1)，它不会给我错误，但也不会加载列表中的最后一个单词。我做错了什么？

错误：

An exception of type 'System.ArgumentOutOfRangeException' occurred in mscorlib.dll but was not handled in user code
Additional information: Index was out of range. Must be non-negative and less than the size of the collection.

if (counter < wordList.Count)
{
    object o = wordList[counter++];
    LabelWord.Text = o.ToString();
}

 if (counter < wordList.Count)
            {
                counter++;
            }