DateTimePicker trong lập trình C# Winform

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace DateTimePickerGUI
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();

            dateTimePicker1.ShowUpDown = true;
            DateTime date = dateTimePicker1.Value;
            date.AddDays(-5);
        }
    }
}
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namespace DateTimePickerGUI
{
    partial class Form1
    {
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ComponentModel.IContainer components = null;

        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region Windows Form Designer generated code

        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.dateTimePicker1 = new System.Windows.Forms.DateTimePicker();
            this.SuspendLayout();
            // 
            // dateTimePicker1
            // 
            this.dateTimePicker1.CustomFormat = "";
            this.dateTimePicker1.Location = new System.Drawing.Point(25, 62);
            this.dateTimePicker1.Name = "dateTimePicker1";
            this.dateTimePicker1.RightToLeftLayout = true;
            this.dateTimePicker1.ShowUpDown = true;
            this.dateTimePicker1.Size = new System.Drawing.Size(200, 20);
            this.dateTimePicker1.TabIndex = 0;
            // 
            // Form1
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(284, 261);
            this.Controls.Add(this.dateTimePicker1);
            this.Name = "Form1";
            this.Text = "Form1";
            this.ResumeLayout(false);

        }

        #endregion

        private System.Windows.Forms.DateTimePicker dateTimePicker1;
    }
}

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