C#.Net 將DateTimePicker設定value設定為空

執行結果：
選擇前：

選擇後：

Code：

using System.Windows.Forms;

namespace Post
{
    public partial class Form1 : Form
    {
        /// <summary>
        /// DateTimePicker
        /// </summary>
        private DateTimePicker dtp = new DateTimePicker();

        /// <summary>
        /// 
        /// </summary>
        public Form1()
        {
            InitializeComponent();
            InitUI();
        }

        /// <summary>
        /// 
        /// </summary>
        private void InitUI()
        {
            //格式為自訂
            dtp.Format = DateTimePickerFormat.Custom;
            //初始化時為空
            dtp.CustomFormat = " ";
            //當資料改變時在設定為正確格式
            dtp.ValueChanged += (s, e) =>
            {
                dtp.CustomFormat = "yyyy/dd/MM";
            };

            this.Controls.Add(dtp);
        }

    }
}