SelectedDatesCollection.Clear Method
Definition
Important
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Removes all DateTime objects from the collection.
public:
void Clear();public void Clear();member this.Clear : unit -> unitPublic Sub Clear ()Examples
The following code example demonstrates how to use the Clear method to remove all System.DateTime objects from the SelectedDatesCollection collection and replace them with new System.DateTime objects.
<%@ Page Language="C#" AutoEventWireup="True" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>SelectedDatesCollection Add Example </title>
<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 id="form1" 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>
<%@ Page Language="VB" AutoEventWireup="True" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>SelectedDatesCollection Add Example </title>
<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 id="form1" 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>
Remarks
Use this method to remove all System.DateTime objects from the SelectedDatesCollection collection and set the Count property to 0.
