表不使用DateTimePicker进行按钮单击过滤

Question

我是C＃编程的新手，目前是学生，我们有一个有关使用datetimepicker对记录进行排序的项目，您可以帮我吗。 我这里有一个绑定到我的datagridview的类

   public class Sales
{
    public int Trans_Code{ get; set; }

    public string Item_Name { get; set; }

    public string Item_Desc { get; set; }

    public string Item_Qty { get; set; }

    public string Item_Price{ get; set; }

    public DateTime Date { get; set; }

}

这是我的按钮，单击两个名为dtFromDate（从该日期开始）dtToDate（到该日期）的日期选择器。

    private void btnLoad_Click(object sender, EventArgs e)
    {
        conn.Open();
        string query = " SELECT * FROM tbl_sales WHERE Date BETWEEN '"+dtFromDate.Value+"' AND '"+dtToDate.Value+"'";
        salesBindingSource1.DataSource = conn.Query<Sales>(query, commandType: CommandType.Text);
        conn.Close();
    }

this is the application and not sorting according to the datetimepicker on button click

and this is my table design