防止 BindingSource 添加两个空白行到 gridview

Question

我有像这样连接到网格控件的bindingsource

 private BindingSource listDepartmentDto = new();
 private async Task LoadDataAsync()
{
    listDepartmentDto.DataSource = await departmentService.GetAllDepartmentsAsync();
    gridControl1.DataSource = listDepartmentDto;
}

，并且我像这样绑定了控件

 private void BindingControls()
{        
    var departmentDto = listDepartmentDto.Current as DepartmentDto;
    txtID.DataBindings.Add(new Binding("EditValue", listDepartmentDto, nameof(departmentDto.IdDepartment)));
    txtTitle.DataBindings.Add(new Binding("EditValue", listDepartmentDto, nameof(departmentDto.NameDepartment)));
    txtDescription.DataBindings.Add(new Binding("EditValue", listDepartmentDto, nameof(departmentDto.DescriptionDepartment)));
}

，并且我使用像这样的当前事件

listDepartmentDto.CurrentChanged += new EventHandler(listDepartmentDtoChanged);
private void listDepartmentDtoChanged(object sender,EventArgs e)
{
    var departmentDto = listDepartmentDto.Current as DepartmentDto;
    if (departmentDto.IdDepartment == 0)
    {
        btnSave.Text = Resources.Save;

        btnNew.Enabled = false;
        btnDelete.Enabled = false;

        txtTitle.Focus();
        return;
    }
    btnSave.Text = Resources.Edit;
    btnNew.Enabled = true;
    btnDelete.Enabled = true;
}

，在btnnew click click evert ymis中，

private async void btnNew_Click(object sender, EventArgs e)
{
    listDepartmentDto.AddNew();       
    await Permission();
}

问题是当我单击btnnew时，它会创建空白行，并且当我选择另一个行且再次单击btnnew，它创建了新的空白行等。
如何防止这种行为？如果用户移动到另一个行而没有输入任何数据，则该行自动删除了
网格视图可食用已设置为false。
网格视图（添加，删除）行设置为false。