c#datagridview对象引用未设置为对象的实例

我正在获取用户输入的数据，并尝试将它们以我创建的另一种形式添加到datagridview中，但是，我有一个

对象引用未设置为对象的实例。当我尝试添加第一行时

代码如下：

    monthTrans mt = new monthTrans();
    private void completeBtn_Click(object sender, EventArgs e)
    {
        var todayDate = DateTime.Now;
        //MessageBox.Show(todayDate.ToString());
        var transType = typeLabel.Text;
        var currencySelected = CurrencyList.Text;
        var amount = AmountText.Text;
        var currencyPrice = currencyPriceText.Text;
        var total = totalAmountText.Text;

        var monthlyData = mt.myData;

        monthlyData.Rows.Add(todayDate, transType, currencySelected, amount, currencyPrice, total);

        //open a new window
        mt.Parent = Parent;
        mt.StartPosition = FormStartPosition.CenterParent;
        if (mt.IsDisposed)
              mt = new monthTrans();
        mt.Show();
    }

错误出现在“monthlyData.Rows.Add…”上

顺便说一句，我在datagridview表单中添加了以下代码，以便在该表单之外访问它：

    public DataGridView myData
    {
        get;
        set;
    }

感谢您的帮助

试试：

private DataGridView _mydata = new DataGridView();
public DataGridView myData
{
    get { return _mydata; }
    set { _mydata = value; } 
}

---

我做了一些修改和工作：DataGridView theData；public monthTrans（）{InitializeComponent（）；theData=DataGridView 1；}public DataGridView myData{get{return theData；}set{theData=value；}感谢您的帮助