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Introduction:
In this Article we'll see how to use the Calendar Control in a Webform.
The Calendar Control shows the Current Month Dates and the Dates also of the previous and Next Month.
So,
- Firstly, we'll show only the Dates of Current Month and
- Secondly based on the EventDate we'll highlight the Date in the Calendar Control
- On selecting the Date we'll show more information of about the Event on that Day.
The Database Data is stored as:

To begin with User Interface Drag and drop
- Calendar Control
- DataGrid
< asp:Calendar id="Calendar1" OnDayRender="CalendarDRender" runat="server" BorderWidth="1px" NextPrevFormat="FullMonth" BackColor="White" Width="350px"ForeColor="Black" Height="190px" Font-Size="9pt" Font-Names="Verdana" BorderColor="White"> <TodayDayStyle BackColor="#CCCCCC"></TodayDayStyle> <NextPrevStyle Font-Size="8pt" Font-Bold="True" ForeColor="#333333" VerticalAlign="Bottom"></NextPrevStyle> <DayHeaderStyle Font-Size="8pt" Font-Bold="True"></DayHeaderStyle> <SelectedDayStyle ForeColor="White" BackColor="#333399"></SelectedDayStyle> <TitleStyle Font-Size="12pt" Font-Bold="True" BorderWidth="4px" ForeColor="#333399" BorderColor="Black" BackColor="White"></TitleStyle> <OtherMonthDayStyle ForeColor="#999999"></OtherMonthDayStyle> </asp:Calendar> <asp:DataGrid id="DataGrid1" style="Z-INDEX: 102; LEFT: 23px; POSITION: absolute; TOP: 271px" runat="server" Font-Size="XX-Small" Font-Names="Verdana" Visible="False"></asp:DataGrid>
Now our code :
In Page_Load
In Calendar1_PreRender
- Check for it the Date is from OtherMonth
- Navigate through the DataSet if Date is not from other month
- Check if the date is null
- If not Set the BackColor for the Date based on the value in the DataBase
In Calendar1_SelectionChanged
- Based on the date Selected in the Calendar Control display the Data in the Datagrid.
C#
SqlConnection mycn; SqlDataAdapter myda; DataSet ds = new DataSet (); DataSet dsSelDate; String strConn; private void Page_Load(object sender, System.EventArgs e) { // Put user code to initialize the page here strConn="Data Source=localhost;uid=sa;pwd=;Initial Catalog=northwind"; mycn = new SqlConnection(strConn); myda = new SqlDataAdapter ("Select * FROM EventsTable", mycn); myda.Fill (ds,"Table"); } protected void CalendarDRender(object sender ,System.Web.UI.WebControls.DayRenderEventArgs e ) { // If the month is CurrentMonth if (! e.Day.IsOtherMonth ) { foreach (DataRow dr in ds.Tables[0].Rows) { if ((dr["EventDate"].ToString() != DBNull.Value.ToString())) { DateTime dtEvent= (DateTime)dr["EventDate"]; if (dtEvent.Equals(e.Day.Date)) { e.Cell.BackColor = Color.PaleVioletRed; } } } } //If the month is not CurrentMonth then hide the Dates else { e.Cell.Text = ""; } } private void Calendar1_SelectionChanged(object sender, System.EventArgs e) { myda = new SqlDataAdapter("Select * from EventsTable where EventDate='" + Calendar1.SelectedDate.ToString() + "'", mycn); dsSelDate = new DataSet(); myda.Fill(dsSelDate, "AllTables"); if (dsSelDate.Tables[0].Rows.Count == 0 ) { DataGrid1.Visible = false; } else { DataGrid1.Visible = true; DataGrid1.DataSource = dsSelDate; DataGrid1.DataBind (); } }
VB.NET
Dim myconnection As SqlConnection Dim myda As SqlDataAdapter Dim ds As New DataSet Dim dsSelDate As DataSet Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load myconnection = New SqlConnection("Server=localhost;uid=sa;password=;database=northwind;") myda = New SqlDataAdapter("Select * from EventsTable", myconnection) myda.Fill(ds, "AllTables") End Sub Protected Sub CalendarDRender(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.DayRenderEventArgs) 'If the month is CurrentMonth If Not e.Day.IsOtherMonth Then Dim dr As DataRow For Each dr In ds.Tables(0).Rows 'If EventDate is not Null If Not dr("EventDate") Is DBNull.Value Then Dim dtEvent As DateTime = dr("EventDate").ToString 'If EventDate =CalendarDate If dtEvent.Equals(e.Day.Date) Then e.Cell.BackColor = Color.PaleVioletRed End If End If Next 'If the month is not CurrentMonth then hide the Dates Else e.Cell.Text = "" End If End Sub Private Sub Calendar1_SelectionChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) _Handles Calendar1.SelectionChanged myda = New SqlDataAdapter("Select * from EventsTable where EventDate='" & _Calendar1.SelectedDate.ToString & "'", myconnection) dsSelDate = New DataSet myda.Fill(dsSelDate, "AllTables") If dsSelDate.Tables(0).Rows.Count = 0 Then DataGrid1.Visible = False Else DataGrid1.Visible = True DataGrid1.DataSource = dsSelDate DataGrid1.DataBind() End If End Sub
The Output of this code:

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