如何将日期选择器与datagridview集成

在我的应用程序中，我正在对员工进行查询，以了解每个员工的订单量。我想添加一个日期过滤器。所以我创建了两个日期时间选择器，并为它们构建了一个函数。其中&我应该如何在它们之间集成，或者我可以在查询中输入一些方法？

代码：

   private void Form3_Load(object sender, EventArgs e)
    {
        this.employeesTableAdapter.Fill(this.nORTHWNDDataSet.Employees);
        using (NorthWindDataContext db = new NorthWindDataContext())
        {
                var query =
                from d in db.Employees
                select new EmployeeData
        {
            FirstName = d.FirstName,
            EmployeeID = d.EmployeeID
        };
            dataGridView1.AutoGenerateColumns = false;
            dataGridView1.DataSource = query;
        }
    }
    public bool CheckDate(DateTime date)
    {
        DateTime floorDate = FromDate.Value;
        DateTime roofDate = ToDate.Value;

        if (date > floorDate && date < roofDate)
        {
            return true;
        }
        else
        {
            return false;
        }
    }


    private void displayOrdersToolStripMenuItem_Click(object sender, EventArgs e)
    {
        using (NorthWindDataContext db = new NorthWindDataContext())
        {
            if (db.Employees == null)
            {
            }
            EmployeeData currentEmployee = (EmployeeData)dataGridView1.SelectedRows[0].DataBoundItem;
            var query =
              from o in db.Employees
              where o.EmployeeID == currentEmployee.EmployeeID 
              select new
              {
                  orderNumber = o.Orders.Count()
              };
            dataGridView2.AutoGenerateColumns = false;
            dataGridView2.DataSource = query;
        }

类似的东西

 where o.EmployeeID == currentEmployee.EmployeeID && o.Orders.Where(x=>x.OrderDate.Value.Date>FromDate.Value.Date&&<ToDate.Value.Date)