Create Custom Calendar

This may help u
aspx

<title>

function openPage(url) {
window.open(url);
}




<asp:calendar id="Calendar1" runat="server" ondayrender="Calendar1_DayRender" xmlns:asp="#unknown">
<selecteddaystyle backcolor="#FF0066">




in Cs

protected void Calendar1_DayRender(object sender, DayRenderEventArgs e)
{
Image image = new Image();
image.ImageUrl = "~/Images/plus.png";
string pageUrl = "http://www.microsoft.com";
image.Attributes.Add("onclick", "openPage('" + pageUrl + "');");
image.Attributes.Add("style", "cursor:pointer");
e.Cell.Controls.Add(image);
}