DateTimePicker in C#.net

How to use DateTimePicker in C#.net

DateTimePicker in C#.net

The DateTimePicker control lets the user interactively pick a single date and time. It provides the developer lot of flexibility and assurance that any value it returns is a valid DateTime value, eliminating the need for extensive data validation. It also automatically considers the computer's regional settings when displaying various date and time formats.

The control uses a relatively small amount of screen real estate, being about the same size as a single line text box.

Once the calendar is dropped down, the user can change months by clicking on scroll buttons to either side of the month and year in the title or by clicking on the month name in the title and selecting from the drop-down menu. If the user clicks on the year in the title, up-down scroll buttons appear, which enable scrolling to a new year.

DateTimePicker in C# (DateTimePicker.cs)

using System;

using System.Drawing;

using System.Windows.Forms;

namespace ProgrammingWinApps

{

   public class DTPicker : Form

   {

      DateTimePicker dtp;

      Label lblToString;

      Label lblLongDate;

      Label lblLongTime;

      Label lblShortDate;

      Label lblShortTime;

      Label lblCustomFormat;

      TextBox txtCustomString;

      public DTPicker(  )

      {

         Text = "DateTimePicker Demo";

         Size = new Size(400,300);

         this.Load += new EventHandler(this_Load);

         dtp = new DateTimePicker(  );

         dtp.Parent = this;

         dtp.Location = new Point(20,20);

         dtp.Size = new Size(ClientSize.Width - 40, dtp.PreferredHeight);

         dtp.Anchor = AnchorStyles.Top | AnchorStyles.Left | 

                  AnchorStyles.Right;

         Font fnt = new Font("Times New Roman", 16);

         dtp.CalendarFont = new Font(fnt, 

                                     FontStyle.Bold | FontStyle.Italic);

         dtp.CalendarForeColor = Color.Red;

         dtp.CalendarMonthBackground = Color.Yellow;

         dtp.CalendarTitleBackColor = Color.Lime;

         dtp.CalendarTitleForeColor = Color.Blue;

         dtp.CalendarTrailingForeColor = Color.FromArgb(255,192,192);

         dtp.CustomFormat = "dddd,MMMM d, yyyy 'at' h:mm:ss tt";

         dtp.Format = DateTimePickerFormat.Custom;

         dtp.DropDownAlign = LeftRightAlignment.Right;

         dtp.ShowUpDown = false;      // default

         dtp.ValueChanged += 

               new EventHandler(dtp_ValueChanged);

         Label lbl1 = new Label(  );

         lbl1.Parent = this;

         lbl1.Text = "ToString:";

         lbl1.Location = new Point(dtp.Left, dtp.Bottom + 20);

         lblToString = new Label(  );

         lblToString.Parent = this;

         lblToString.Size = new Size(200, 

                                     lblToString.PreferredHeight + 10);

         lblToString.Location = new Point(lbl1.Right, dtp.Bottom + 20);

         Label lbl2 = new Label(  );

         lbl2.Parent = this;

         lbl2.Text = "Long Date:";

         lbl2.Location = new Point(dtp.Left, lblToString.Bottom);

         lblLongDate = new Label(  );

         lblLongDate.Parent = this;

         lblLongDate.Size = new Size(200, 

                                     lblLongDate.PreferredHeight + 10);

         lblLongDate.Location = new Point(lbl1.Right, 

                                          lblToString.Bottom );

         Label lbl3 = new Label(  );

         lbl3.Parent = this;

         lbl3.Text = "Long Time:";

         lbl3.Location = new Point(dtp.Left, lblLongDate.Bottom);

         lblLongTime = new Label(  );

         lblLongTime.Parent = this;

         lblLongTime.Size = lblLongDate.Size;

         lblLongTime.Location = new Point(lbl1.Right, lblLongDate.Bottom);

         Label lbl4 = new Label(  );

         lbl4.Parent = this;

         lbl4.Text = "Short Date:";

         lbl4.Location = new Point(dtp.Left, lblLongTime.Bottom);

         lblShortDate = new Label(  );

         lblShortDate.Parent = this;

         lblShortDate.Size = lblLongDate.Size;

         lblShortDate.Location = new Point(lbl1.Right,

                                           lblLongTime.Bottom);

         Label lbl5 = new Label(  );

         lbl5.Parent = this;

         lbl5.Text = "Short Time:";

         lbl5.Location = new Point(dtp.Left, lblShortDate.Bottom);

         lblShortTime = new Label(  );

         lblShortTime.Parent = this;

         lblShortTime.Size = lblLongDate.Size;

         lblShortTime.Location = new Point(lbl1.Right,

                                           lblShortDate.Bottom);

         Label lbl6 = new Label(  );

         lbl6.Parent = this;

         lbl6.Text = "Custom String:";

         lbl6.Location = new Point(dtp.Left, lblShortTime.Bottom);

         txtCustomString = new TextBox(  );

         txtCustomString.Parent = this;

         txtCustomString.Size = lblLongDate.Size;

         txtCustomString.Location = new Point(lbl1.Right,

                                              lblShortTime.Bottom);

         txtCustomString.Text = "D";

         txtCustomString.TextChanged += 

               new EventHandler(txtCustomString_TextChanged);

         Label lbl7 = new Label(  );

         lbl7.Parent = this;

         lbl7.Text = "Custom Format:";

         lbl7.Location = new Point(dtp.Left, txtCustomString.Bottom + 5);

         lblCustomFormat = new Label(  );

         lblCustomFormat.Parent = this;

         lblCustomFormat.Size = new Size(lblLongDate.Width,

                                         lblLongDate.Height * 3);

         lblCustomFormat.Location = new Point(lbl1.Right,

                                              txtCustomString.Bottom + 5);

      }  //  close for constructor

      static void Main(  ) 

      {

         Application.Run(new DTPicker(  ));

      }

      private void UpdateLabels(  )

      {

         lblToString.Text = dtp.Value.ToString(  );

         lblLongDate.Text = dtp.Value.ToLongDateString(  );

         lblLongTime.Text = dtp.Value.ToLongTimeString(  );

         lblShortDate.Text = dtp.Value.ToShortDateString(  );

         lblShortTime.Text = dtp.Value.ToShortTimeString(  );

         lblCustomFormat.Text = dtp.Value.ToString(txtCustomString.Text);

      }

      private void this_Load(object sender, EventArgs e)

      {

         UpdateLabels(  );

      }

      private void dtp_ValueChanged(object sender, EventArgs e)

      {

         UpdateLabels(  );

      }      

      private void txtCustomString_TextChanged(object sender, EventArgs e)

      {

         UpdateLabels(  );

      }      

   }      //  close for form class

}         //  close form namespace