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C# version:
http://code.msdn.microsoft.com/CSASPNETDisplayAddtionalTex-3a9f7013
VB version: http://code.msdn.microsoft.com/VBASPNETDisplayAddtionalTex-c7f86fb5

The project illustrates how to display additional text in a calendar control.  As we know, people may want to add different customize text when date of Calendar has been selected. Here we give an easy way to set Calendar's specified text, background color, border properties and make Calendar looks better.

The sample was written by our star writer: Arwind Gao

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Introduction

The project illustrates how to display additional text in a calendar control. As we know, people may want to add different customize text when date of Calendar has been selected. Here we give an easy way to set Calendar's specified text, background color, border properties and make Calendar looks better.

 

Running the Code

Please follow these demonstration steps below.

Step 1: Open the VBASPNETDisplayAddtionalTextInCalendar.sln.

Step 2: Expand the VBASPNETDisplayAddtionalTextInCalendar web application and press Ctrl + F5 to show the Default.aspx.

Step 3: You can find a Calendar control on the Default.aspx page. Please Click to select one of dates.

Step 4: You will see "your text" in the bottom of every selected date.

Step 5: Validation finished.

 

Using the Code

Step 1. Create a VB "ASP.NET Empty Web Application" in Visual Studio 2010 or Visual Web Developer 2010. Name it as "VBASPNETDisplayAddtionalTextInCalendar".

Step 2. Add one web form in the root directory, name it as "Default.aspx".

Step 3. Add a Calendar control and a button on default page, The calendar control display the selected dates and additional text, The Button is use to output all selected dates.

Step 4. Define a list of DateTime instances for storing selected dates.  The List<DateTime> variable store in ViewState.

   ' Define a list of DateTime to store selected date.
   Dim SelectDates As New List(Of DateTime)()

   ''' <summary>
   ''' The selected dates is stored in ViewState.
   ''' </summary>
   Public Property GetDateTimeList() As List(Of DateTime)
       Get
           If ViewState("SelectDate") Is Nothing Then
               Dim selectdates As New List(Of DateTime)()
               selectdates.Add(DateTime.MaxValue)
               ViewState("SelectDate") = selectdates
           End If
           Return DirectCast(ViewState("SelectDate"), List(Of DateTime))
       End Get
       Set(ByVal value As List(Of DateTime))
           ViewState("SelectDate") = value
       End Set
   End Property
        [/code]   

Step 5  Add Calendar SelectionChanged, PreRender, DayRender event to add
       date time in selected date list or remove date from it.
        [code]
   ''' <summary>
   ''' Calendar SelectionChanged event, add new date in SelectedDate and
   ''' remove the same date.
   ''' </summary>
   ''' <param name="sender"></param>
   ''' <param name="e"></param>
   Protected Sub myCalendar_SelectionChanged(ByVal sender As Object, ByVal e As EventArgs)
       Dim dateSeletion As DateTime = myCalendar.SelectedDate
       If SelectDates.Contains(dateSeletion) Then
           SelectDates.Remove(dateSeletion)
       Else
           SelectDates.Add(dateSeletion)
       End If
   End Sub

   ''' <summary>
   ''' Clear selected dates.
   ''' </summary>
   ''' <param name="sender"></param>
   ''' <param name="e"></param>
   Protected Sub myCalendar_PreRender(ByVal sender As Object, ByVal e As EventArgs)
       myCalendar.SelectedDates.Clear()
   End Sub

   ''' <summary>
   ''' Add your customize text in Calendar control.
   ''' </summary>
   ''' <param name="sender"></param>
   ''' <param name="e"></param>
   Protected Sub myCalendar_DayRender(ByVal sender As Object, ByVal e As DayRenderEventArgs)
       For Each time As DateTime In SelectDates
           myCalendar.SelectedDates.Add(time)
           If e.Day.[Date] = time Then
               e.Cell.BorderWidth = 1
               e.Cell.BackColor = Color.SlateBlue
               e.Cell.Controls.Add(New LiteralControl("<br />your text"))
           End If
       Next
   End Sub
        [/code]

Step 6. Add button's click event, the button will display the selected dates
       on default page, actually we may store them in database or xml files.
        Here we only output them.
        [code]
   ''' <summary>
   ''' render selected dates.
   ''' </summary>
   ''' <param name="sender"></param>
   ''' <param name="e"></param>
   Protected Sub btnCheck_Click(ByVal sender As Object, ByVal e As EventArgs)
       For Each [date] As DateTime In SelectDates
           If [date] <> DateTime.MaxValue Then
               Response.Write([date].ToShortDateString())
               Response.Write("<br />")
           End If
       Next
   End Sub

Step 7. Build the application and you can debug it.

 

More Information

MSDN: Calendar Class
http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.calendar(VS.80).aspx

MSDN: Calendar.SelectionChanged Event
http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.calendar.selectionchanged.aspx

MSDN: Control.PreRender Event
http://msdn.microsoft.com/en-us/library/system.web.ui.control.prerender.aspx

MSDN: Calendar.DayRender Event
http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.calendar.dayrender.aspx