[Solved] Losing programatically created CalendarDayTemplates on postback

[Glenn Boothe]

I've got a calendar that has CalendarDayTemplates created dynamically on load and then assigns each one to a SpecialDay in the calendar. Please see below.

If Not IsPostBack Then

Dim i as Integer = 0

For Each d As RadDate In cal.SelectedDates

dvTimespots.RowFilter = "startdate <= #" & d.Date & "# AND enddate >= #" & d.Date & "#"

Dim cdt As New CalendarDayTemplate(d.Date.Day, dvTimespots.Count & " media item(s)")

Dim dt As New DayTemplate

With dt

.Content = cdt

.ID = i

End With

cal.CalendarDayTemplates.Add(dt)

Dim rcd As New RadCalendarDay

With rcd

.Date = d.Date

.TemplateID = i

End With

cal.SpecialDays.Add(rcd)

i += 1

Next             End If

This works great when the page is not postback, but on any postback I get this error:
System.Exception: Template with ID: 0 not found.

I'm assuming that's because the first special day rendered has a TemplateID of 0, which is not being persisted.

Is this expected functionality? Is there a workaround without re-running the above?

[Iana Tsolova]

Hello Glenn,

When creating DayTemplate dynamically, you should do it on each page load.
If you do not want to query your database on each page load in your case, you can get the desired data once on initial load and save is in a variable you would use later on.

Sincerely yours,
Iana
the Telerik team