How to use calendar control and add events name with date using C# in ASP.Net

Hi amitj,

I have created sample code which fullfill your requirement.

HTML

<div>
    <asp:Calendar ID="Calendar1" runat="server" BackColor="#FFFFCC" 
        BorderColor="#FFCC66" BorderWidth="1px" DayNameFormat="Shortest" 
        Font-Names="Verdana" Font-Size="8pt" ForeColor="#663399" Height="200px" 
        ondayrender="Calendar1_DayRender" ShowGridLines="True" Width="220px">
        <DayHeaderStyle BackColor="#FFCC66" Font-Bold="True" Height="1px" />
        <NextPrevStyle Font-Size="9pt" ForeColor="#FFFFCC" />
        <OtherMonthDayStyle ForeColor="#CC9966" />
        <SelectedDayStyle BackColor="#CCCCFF" Font-Bold="True" />
        <SelectorStyle BackColor="#FFCC66" />
        <TitleStyle BackColor="#990000" Font-Bold="True" Font-Size="9pt" 
            ForeColor="#FFFFCC" />
        <TodayDayStyle BackColor="#FFCC66" ForeColor="White" />
    </asp:Calendar>
</div>

C#

DataTable dt = new DataTable();
protected void Page_Load(object sender, EventArgs e)
{
    dt.Columns.Add("EventName");
    dt.Columns.Add("Date", typeof(DateTime));
    dt.Rows.Add("Party", DateTime.Now.Date);
    dt.Rows.Add("Exam", DateTime.Now.Date.AddDays(5));
    dt.Rows.Add("Study", DateTime.Now.Date.AddDays(10));
}

protected void Calendar1_DayRender(object sender, DayRenderEventArgs e)
{
    foreach (DataRow row in dt.Rows)
    {
        if (Convert.ToDateTime(e.Day.Date) == Convert.ToDateTime(row["Date"]))
        {
            e.Cell.Text = e.Day.DayNumberText + "<br/>" + row["EventName"].ToString();
        }
    }
}

vb.net

Private dt As New DataTable()
Protected Sub Page_Load(sender As Object, e As EventArgs)
	dt.Columns.Add("EventName")
	dt.Columns.Add("Date", GetType(DateTime))
	dt.Rows.Add("Party", DateTime.Now.[Date])
	dt.Rows.Add("Exam", DateTime.Now.[Date].AddDays(5))
	dt.Rows.Add("Study", DateTime.Now.[Date].AddDays(10))
End Sub

Protected Sub Calendar1_DayRender(sender As Object, e As DayRenderEventArgs)
	For Each row As DataRow In dt.Rows
		If Convert.ToDateTime(e.Day.[Date]) = Convert.ToDateTime(row("Date")) Then
			e.Cell.Text = e.Day.DayNumberText + "<br/>" + row("EventName").ToString()
		End If
	Next
End Sub

Screenshot