# Day Templates
The [ASP NET AJAX Calendar](https://www.telerik.com/products/aspnet-ajax/calendar.aspx) allows you to define a collection of dynamic templates that customize the presentation of calendar days on a "per day" basis. The templates can contain regular HTML and are particularly useful if you want to implement a scheduler-like interface with extra information, such as images illustrating events, links to additional sources, etc.
The following steps describe how to implement Day Templates:
1. Define the Dynamic Template types.
1. Click the ellipsis button next to the **CalendarDayTemplates** property in the properties pane. This brings up the [DayTemplate Collection Editor](https://www.telerik.com/products/aspnet-ajax/documentation/controls/calendar/design-time/daytemplate-collection-editor).
2. In the collection editor, create individual template types for each type of day you want to customize, giving each unique ID. The following example shows the result of this step:
```ASPNET
```
2. Create the templates.
1. For each template type, bring up the **RadCalendar** context menu, select **Edit Template**, and choose the template type. This brings up the [Template Design Surface](https://www.telerik.com/products/aspnet-ajax/documentation/controls/calendar/design-time/template-design-surface) for the template.
2. Drag controls from the toolbox onto the template design surface and set their properties to create the templates:
```ASPNET
date
mortgage
birthday
```
3. Add Special Days to the calendar and assign the templates.
1. You can define the special days at design time using the [RadCalendarDay Collection Editor](https://www.telerik.com/products/aspnet-ajax/documentation/controls/calendar/design-time/radcalendarday-collection-editor). For each special day you add, in addition to any other properties, set the **TemplateID** property to the ID of the template you want to assign to that special day:
```ASPNET
date
mortgage
birthday
```
2. You can also add special days dynamically at runtime:
> note Note that the best approach for adding days to the **SpecialDays** collection is on **Page_Load** event. Also if the special days should persist not only in the current view but in other month views the **AutoPostBack** property of the **RadCalendar** should be set to **true** .
```C#
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
RadCalendarDay NewDay = new RadCalendarDay(RadCalendar1);
NewDay.Date = new DateTime(2010, 11, 12);
NewDay.Repeatable = RecurringEvents.DayAndMonth;
NewDay.TemplateID = "BirthdayTemplate";
NewDay.ToolTip = "Anne's Birthday";
RadCalendar1.SpecialDays.Add(NewDay);
}
}
```
```VB.NET
Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
If Not IsPostBack Then
Dim NewDay As New RadCalendarDay(RadCalendar1)
NewDay.Date = New DateTime(2010, 11, 12)
NewDay.Repeatable = RecurringEvents.DayAndMonth
NewDay.TemplateID = "BirthdayTemplate"
NewDay.ToolTip = "Anne's Birthday"
RadCalendar1.SpecialDays.Add(NewDay)
End If
End Sub
```
> note
> You can add special days to a calendar without using templates. You can use their **ItemStyle** property to make them visually distinct.