关闭时如何在DataGridView DataTable中通知用户未保存的更改？

private DataTable originalData; // 原始数据源

private void Form1_Load(object sender, EventArgs e)
{
    // 加载数据到DataGridView和originalData
    originalData = LoadDataFromSource();
    dataGridView1.DataSource = originalData;
}

private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
    if (HasUnsavedChanges())
    {
        DialogResult result = MessageBox.Show("是否保存更改？", "提示", MessageBoxButtons.YesNoCancel, MessageBoxIcon.Question);
        if (result == DialogResult.Yes)
        {
            SaveChanges();
        }
        else if (result == DialogResult.Cancel)
        {
            e.Cancel = true; // 取消关闭操作
        }
    }
}

private bool HasUnsavedChanges()
{
    DataTable currentData = (DataTable)dataGridView1.DataSource;
    return !originalData.AsEnumerable().SequenceEqual(currentData.AsEnumerable());
}

private void SaveChanges()
{
    DataTable currentData = (DataTable)dataGridView1.DataSource;
    // 将更改更新到数据源
    UpdateDataToSource(currentData);
    originalData = currentData.Copy(); // 更新原始数据源
}

private DataTable LoadDataFromSource()
{
    // 从数据源加载数据到DataTable
    // 示例代码省略
}

private void UpdateDataToSource(DataTable data)
{
    // 将DataTable中的更改更新到数据源
    // 示例代码省略
}