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MonthCalendar.DateChanged Event

Occurs when the date selected in the MonthCalendar changes.

Namespace: System.Windows.Forms
Assembly: System.Windows.Forms (in system.windows.forms.dll)

public event DateRangeEventHandler DateChanged
/** @event */
public void add_DateChanged (DateRangeEventHandler value)

/** @event */
public void remove_DateChanged (DateRangeEventHandler value)

JScript supports the use of events, but not the declaration of new ones.

The DateChanged event occurs during any date selection, whether by mouse, keyboard, or code. The DateSelected event is similar, but it occurs only at the end of a date selection made using the mouse.

For more information about handling events, see Consuming Events.

The following code example creates a SelectionRange, sets its Start and End properties, and assigns the SelectionRange to the SelectionRange property of the MonthCalendar control. When the DateChanged event is raised, the Start and End property values are displayed in the text boxes. This example requires that you have a Form with two TextBox controls, a Button, and a MonthCalendar control.

private void button1_Click(object sender, System.EventArgs e)
{
   // Create a SelectionRange object and set its Start and End properties.
   SelectionRange sr = new SelectionRange();
   sr.Start = DateTime.Parse(this.textBox1.Text);
   sr.End = DateTime.Parse(this.textBox2.Text);
   /* Assign the SelectionRange object to the 
      SelectionRange property of the MonthCalendar control. */
   this.monthCalendar1.SelectionRange = sr;
}

private void monthCalendar1_DateChanged(object sender, DateRangeEventArgs e)
{
   /* Display the Start and End property values of 
      the SelectionRange object in the text boxes. */
   this.textBox1.Text = 
     monthCalendar1.SelectionRange.Start.Date.ToShortDateString();
   this.textBox2.Text = 
     monthCalendar1.SelectionRange.End.Date.ToShortDateString();
}

private void button1_Click(Object sender, System.EventArgs e)
{
    // Create a SelectionRange object and set its Start and End properties.
    SelectionRange sr = new SelectionRange();
    sr.set_Start(DateTime.Parse(this.textBox1.get_Text()));
    sr.set_End(DateTime.Parse(this.textBox2.get_Text()));

    /* Assign the SelectionRange object to the 
       SelectionRange property of the MonthCalendar control. */
    this.monthCalendar1.set_SelectionRange(sr);
} //button1_Click

private void monthCalendar1_DateChanged(Object sender, DateRangeEventArgs e)
{
    /* Display the Start and End property values of 
       the SelectionRange object in the text boxes. */
    this.textBox1.set_Text(monthCalendar1.get_SelectionRange().get_Start().
        get_Date().ToShortDateString());
    this.textBox2.set_Text(monthCalendar1.get_SelectionRange().get_End().
        get_Date().ToShortDateString());
} //monthCalendar1_DateChanged

The following code example displays a form containing a MonthCalendar control that displays one calendar year. The example demonstrates setting the BackColor, ForeColor, TitleBackColor, TitleForeColor, CalendarDimensions, and TrailingForeColor properties to customize the look of the calendar control. Other properties such as AnnuallyBoldedDates, BoldedDates, and MonthlyBoldedDates are set to customize which dates are bold. The example also sets the FirstDayOfWeek, MaxDate, MinDate, and MaxSelectionCount properties to change the calendar format. The DateSelected and DateChanged events are also handled and their status is displayed on the form.

using System;
using System.Drawing;
using System.Windows.Forms;

public class Form1 : System.Windows.Forms.Form
{
    private System.Windows.Forms.MonthCalendar monthCalendar1;
    private System.Windows.Forms.TextBox textBox1;

    [STAThread]
    static void Main() 
    {
        Application.Run(new Form1());
    }

    public Form1()
    {
        this.textBox1 = new System.Windows.Forms.TextBox();
        this.textBox1.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
        this.textBox1.Location = new System.Drawing.Point(48, 488);
        this.textBox1.Multiline = true;
        this.textBox1.ReadOnly = true;
        this.textBox1.Size = new System.Drawing.Size(824, 32);

        // Create the calendar.
        this.monthCalendar1 = new System.Windows.Forms.MonthCalendar();

        // Set the calendar location.
        this.monthCalendar1.Location = new System.Drawing.Point(47, 16);

        // Change the color.
        this.monthCalendar1.BackColor = System.Drawing.SystemColors.Info;
        this.monthCalendar1.ForeColor = System.Drawing.Color.FromArgb(
                                 ((System.Byte)(192)), ((System.Byte)(0)), ((System.Byte)(192)));
        this.monthCalendar1.TitleBackColor = System.Drawing.Color.Purple;
        this.monthCalendar1.TitleForeColor = System.Drawing.Color.Yellow;
        this.monthCalendar1.TrailingForeColor = System.Drawing.Color.FromArgb(
                                 ((System.Byte)(192)), ((System.Byte)(192)), ((System.Byte)(0)));

        // Add dates to the AnnuallyBoldedDates array.
        this.monthCalendar1.AnnuallyBoldedDates = 
            new System.DateTime[] { new System.DateTime(2002, 4, 20, 0, 0, 0, 0),
                                    new System.DateTime(2002, 4, 28, 0, 0, 0, 0),
                                    new System.DateTime(2002, 5, 5, 0, 0, 0, 0),
                                    new System.DateTime(2002, 7, 4, 0, 0, 0, 0),
                                    new System.DateTime(2002, 12, 15, 0, 0, 0, 0),
                                    new System.DateTime(2002, 12, 18, 0, 0, 0, 0)};

        // Add dates to BoldedDates array.
        this.monthCalendar1.BoldedDates = new System.DateTime[] {new System.DateTime(2002, 9, 26, 0, 0, 0, 0)};

        // Add dates to MonthlyBoldedDates array.
        this.monthCalendar1.MonthlyBoldedDates = 
           new System.DateTime[] {new System.DateTime(2002, 1, 15, 0, 0, 0, 0),
                                  new System.DateTime(2002, 1, 30, 0, 0, 0, 0)};

        // Configure the calendar to display 3 rows by 4 columns of months.
        this.monthCalendar1.CalendarDimensions = new System.Drawing.Size(4, 3);

        // Set week to begin on Monday.
        this.monthCalendar1.FirstDayOfWeek = System.Windows.Forms.Day.Monday;

        // Set the maximum visible date on the calendar to 12/31/2010.
        this.monthCalendar1.MaxDate = new System.DateTime(2010, 12, 31, 0, 0, 0, 0);

        // Set the minimum visible date on calendar to 12/31/2010.
        this.monthCalendar1.MinDate = new System.DateTime(1999, 1, 1, 0, 0, 0, 0);

        // Only allow 21 days to be selected at the same time.
        this.monthCalendar1.MaxSelectionCount = 21;

        // Set the calendar to move one month at a time when navigating using the arrows.
        this.monthCalendar1.ScrollChange = 1;

        // Do not show the "Today" banner.
        this.monthCalendar1.ShowToday = false;

        // Do not circle today's date.
        this.monthCalendar1.ShowTodayCircle = false;
            
        // Show the week numbers to the left of each week.
        this.monthCalendar1.ShowWeekNumbers = true;

        // Add event handlers for the DateSelected and DateChanged events
        this.monthCalendar1.DateSelected += new System.Windows.Forms.DateRangeEventHandler(this.monthCalendar1_DateSelected);
        this.monthCalendar1.DateChanged += new System.Windows.Forms.DateRangeEventHandler(this.monthCalendar1_DateChanged);

        // Set up how the form should be displayed and add the controls to the form.
        this.ClientSize = new System.Drawing.Size(920, 566);
        this.Controls.AddRange(new System.Windows.Forms.Control[] {this.textBox1, this.monthCalendar1});
        this.Text = "Month Calendar Example";
    }

    private void monthCalendar1_DateSelected(object sender, System.Windows.Forms.DateRangeEventArgs e)
    {
        // Show the start and end dates in the text box.
        this.textBox1.Text = "Date Selected: Start = " +
            e.Start.ToShortDateString() + " : End = " + e.End.ToShortDateString();
    }

    private void monthCalendar1_DateChanged(object sender, System.Windows.Forms.DateRangeEventArgs e)
    {
        // Show the start and end dates in the text box.
        this.textBox1.Text = "Date Changed: Start =  " +
            e.Start.ToShortDateString() + " : End = " + e.End.ToShortDateString();
    }
}

import System.*;
import System.Drawing.*;
import System.Windows.Forms.*;

public class Form1 extends System.Windows.Forms.Form
{
    private System.Windows.Forms.MonthCalendar monthCalendar1;
    private System.Windows.Forms.TextBox textBox1;

    /** @attribute STAThread()
     */
    public static void main(String[] args)
    {
        Application.Run(new Form1());
    } //main

    public Form1()
    {
        this.textBox1 = new System.Windows.Forms.TextBox();
        this.textBox1.set_BorderStyle(
            System.Windows.Forms.BorderStyle.FixedSingle);
        this.textBox1.set_Location(new System.Drawing.Point(48, 488));
        this.textBox1.set_Multiline(true);
        this.textBox1.set_ReadOnly(true);
        this.textBox1.set_Size(new System.Drawing.Size(824, 32));
        // Create the calendar.
        this.monthCalendar1 = new System.Windows.Forms.MonthCalendar();
        // Set the calendar location.
        this.monthCalendar1.set_Location(new System.Drawing.Point(47, 16));
        // Change the color.
        this.monthCalendar1.set_BackColor(
            System.Drawing.SystemColors.get_Info());
        this.monthCalendar1.set_ForeColor(
            System.Drawing.Color.FromArgb(192, 0, 192));
        this.monthCalendar1.set_TitleBackColor(System.Drawing.Color.get_Purple());
        this.monthCalendar1.set_TitleForeColor(System.Drawing.Color.get_Yellow());
        this.monthCalendar1.set_TrailingForeColor(
            System.Drawing.Color.FromArgb(192, 192, 0));
        // Add dates to the AnnuallyBoldedDates array.
        this.monthCalendar1.set_AnnuallyBoldedDates(new System.DateTime[] {
            new System.DateTime(2002, 4, 20, 0, 0, 0, 0),
            new System.DateTime(2002, 4, 28, 0, 0, 0, 0),
            new System.DateTime(2002, 5, 5, 0, 0, 0, 0),
            new System.DateTime(2002, 7, 4, 0, 0, 0, 0),
            new System.DateTime(2002, 12, 15, 0, 0, 0, 0),
            new System.DateTime(2002, 12, 18, 0, 0, 0, 0) });
        // Add dates to BoldedDates array.
        this.monthCalendar1.set_BoldedDates(new System.DateTime[] {
            new System.DateTime(2002, 9, 26, 0, 0, 0, 0) });
        // Add dates to MonthlyBoldedDates array.
        this.monthCalendar1.set_MonthlyBoldedDates(new System.DateTime[] {
            new System.DateTime(2002, 1, 15, 0, 0, 0, 0),
            new System.DateTime(2002, 1, 30, 0, 0, 0, 0) });
        // Configure the calendar to display 3 rows by 4 columns of months.
        this.monthCalendar1.set_CalendarDimensions(new System.Drawing.Size(4, 3));
        // Set week to begin on Monday.
        this.monthCalendar1.set_FirstDayOfWeek(System.Windows.Forms.Day.Monday);
        // Set the maximum visible date on the calendar to 12/31/2010.
        this.monthCalendar1.set_MaxDate(
            new System.DateTime(2010, 12, 31, 0, 0, 0, 0));
        // Set the minimum visible date on calendar to 12/31/2010.
        this.monthCalendar1.set_MinDate(
            new System.DateTime(1999, 1, 1, 0, 0, 0, 0));
        // Only allow 21 days to be selected at the same time.
        this.monthCalendar1.set_MaxSelectionCount(21);
        // Set the calendar to move one month at a time when navigating
        // using the arrows.
        this.monthCalendar1.set_ScrollChange(1);
        // Do not show the "Today" banner.
        this.monthCalendar1.set_ShowToday(false);
        // Do not circle today's date.
        this.monthCalendar1.set_ShowTodayCircle(false);
        // Show the week numbers to the left of each week.
        this.monthCalendar1.set_ShowWeekNumbers(true);
        // Add event handlers for the DateSelected and DateChanged events
        this.monthCalendar1.add_DateSelected(
            new System.Windows.Forms.DateRangeEventHandler(
            this.monthCalendar1_DateSelected));
        this.monthCalendar1.add_DateChanged(
            new System.Windows.Forms.DateRangeEventHandler(
            this.monthCalendar1_DateChanged));
        // Set up how the form should be displayed and add the controls to
        // the form.
        this.set_ClientSize(new System.Drawing.Size(920, 566));
        this.get_Controls().AddRange(new System.Windows.Forms.Control[] {
            this.textBox1, this.monthCalendar1 });
        this.set_Text("Month Calendar Example");
    } //Form1

    private void monthCalendar1_DateSelected(Object sender,
        System.Windows.Forms.DateRangeEventArgs e)
    {
        // Show the start and end dates in the text box.
        this.textBox1.set_Text("Date Selected: Start = "
            + e.get_Start().ToShortDateString() + " : End = "
            + e.get_End().ToShortDateString());
    } //monthCalendar1_DateSelected

    private void monthCalendar1_DateChanged(Object sender,
        System.Windows.Forms.DateRangeEventArgs e)
    {
        // Show the start and end dates in the text box.
        this.textBox1.set_Text("Date Changed: Start =  "
            + e.get_Start().ToShortDateString() + " : End = "
            + e.get_End().ToShortDateString());
    } //monthCalendar1_DateChanged
} //Form1

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0

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