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SelectedDatesCollection.Clear Method

Removes all System.DateTime objects from the collection.

[Visual Basic]
Public Sub Clear()
[C#]
public void Clear();
[C++]
public: void Clear();
[JScript]
public function Clear();

Remarks

Use this method to remove all System.DateTime objects from the SelectedDatesCollection and set the Count property to 0.

Example

[Visual Basic, C#] The following example demonstrates how to use the Clear method to remove all System.DateTime objects from the SelectedDatesCollection and replace them with new System.DateTime objects.

[Visual Basic] 
<%@ Page Language="VB" AutoEventWireup="True" %>

<html>
<head>
 
   <script runat="server">

      Sub Page_Load(sender As Object, e As EventArgs)

         ' Initialize the VisibleDate property with today's date when
         ' the page is first loaded.
         If Not IsPostBack Then

            Calendar1.VisibleDate = Calendar1.TodaysDate

         End If

      End Sub
     
      Sub Button_Click(sender As Object, e As EventArgs) 

         ' This method demonstrates how to select noncontiguous dates 
         ' in the calendar. 
  
         ' Get the month, day, and year of the date contained in the 
         ' VisibleDate property.
         Dim CurrentMonth As Integer = Calendar1.VisibleDate.Month
         Dim CurrentYear As Integer = Calendar1.VisibleDate.Year
   
         ' Clear all selected dates.
         Calendar1.SelectedDates.Clear()
   
         ' Iterate through the current month and add all Wednesdays 
         ' to the collection.
         Dim i As Integer

         For i = 1 To System.DateTime.DaysInMonth(CurrentYear, CurrentMonth)

            Dim CurrentDate As DateTime = _
                New DateTime(CurrentYear, CurrentMonth, i)

            If CurrentDate.DayOfWeek = DayOfWeek.Wednesday Then
            
                Calendar1.SelectedDates.Add(CurrentDate)
            
            End If

         Next i
 
         ' Display the number of items selected.
         Message.Text = "Selection Count = " & _
             Calendar1.SelectedDates.Count.ToString()
 
      End Sub
 
      Sub Selection_Change(sender As Object, e As EventArgs) 

         ' Display the number of items selected.
         Message.Text = "Selection Count = " & _
             Calendar1.SelectedDates.Count.ToString()

      End Sub
 
   </script>
 
</head>     
<body>
 
   <form runat="server">

      <h3>SelectedDatesCollection Add Example </h3>

      Click the button to select all Wednesdays in the month.

      <br><br>
 
      <asp:Calendar ID="Calendar1" runat="server"  
           SelectionMode="DayWeekMonth" 
           OnSelectionChanged="Selection_Change" />
 
      <hr>
 
      <asp:Button id="SubmitButton"
           Text="Select All Weds in Month" 
           OnClick="Button_Click"  
           runat=server  /> 

      <br>
 
      <asp:Label id="Message" 
           runat="server" />

   </form>

</body>
</html>
 

[C#] 
<%@ Page Language="C#" AutoEventWireup="True" %>

<html>
<head>
 
   <script runat="server">

      void Page_Load(Object sender, EventArgs e)
      {

         // Initialize the VisibleDate property with today's date when
         // the page is first loaded.
         if(!IsPostBack)
         {

            Calendar1.VisibleDate = Calendar1.TodaysDate;

         }

      }
     
      void Button_Click(Object sender, EventArgs e) 
      {

         // This method demonstrates how to select noncontiguous dates 
         // in the calendar. 
  
         // Get the month and year of the date contained in the 
         // VisibleDate property.
         int CurrentMonth = Calendar1.VisibleDate.Month;
         int CurrentYear = Calendar1.VisibleDate.Year;
   
         // Clear all selected dates.
         Calendar1.SelectedDates.Clear();
   
         // Iterate through the current month and add all Wednesdays 
         // to the collection.
         for (int i = 1; 
             i <= System.DateTime.DaysInMonth(CurrentYear, CurrentMonth);
              i++)
         {

            DateTime CurrentDate = new DateTime(CurrentYear, CurrentMonth, i);

            if (CurrentDate.DayOfWeek == DayOfWeek.Wednesday)
            {
               Calendar1.SelectedDates.Add(CurrentDate);
            }

         }
 
         // Display the number of items selected.
         Message.Text = "Selection Count = " + 
             Calendar1.SelectedDates.Count.ToString();
 
      }
 
      void Selection_Change(Object sender, EventArgs e) 
      {

         // Display the number of items selected.
         Message.Text = "Selection Count = " + 
             Calendar1.SelectedDates.Count.ToString();

      }
 
   </script>
 
</head>     
<body>
 
   <form runat="server">

      <h3>SelectedDatesCollection Add Example </h3>

      Click the button to select all Wednesdays in the month.

      <br><br>
 
      <asp:Calendar ID="Calendar1" runat="server"  
           SelectionMode="DayWeekMonth" 
           OnSelectionChanged="Selection_Change" />
 
      <hr>
 
      <asp:Button id="SubmitButton"
           Text="Select All Weds in Month" 
           OnClick="Button_Click"  
           runat=server  /> 

      <br>
 
      <asp:Label id="Message" 
           runat="server" />

   </form>

</body>
</html>
 

[C++, JScript] No example is available for C++ or JScript. To view a Visual Basic or C# example, click the Language Filter button Language Filter in the upper-left corner of the page.

Requirements

Platforms: Windows 2000, Windows XP Professional, Windows Server 2003 family

See Also

SelectedDatesCollection Class | SelectedDatesCollection Members | System.Web.UI.WebControls Namespace | System.DateTime | Count

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