How to print a calendar?

In Firefox the printing works fine but in IE it does what you describe. It's probably because the image is a result of a PostBack (it looks like a IE limitation). If you make a copy of the page and call the exporting code in a Page_Load instead of ButtonExport_Click you should get rid of that problem:

protected void Page_Load(object sender, EventArgs e)
{
  DayPilotCalendar1.StartDate = Convert.ToDateTime(Request.QueryString["StartDate"]);
  DayPilotCalendar1.DataBind();

  int hourHeight = DayPilotCalendar1.CellsPerHour*DayPilotCalendar1.CellHeight;

  Response.Clear();
  Response.ContentType = "image/png";
  MemoryStream img = DayPilotCalendar1.Export(ImageFormat.Png, 9 * hourHeight);
  img.WriteTo(Response.OutputStream);
  Response.End();
}

You will need to pass the parameters in the URL (typically the StartDate):

<a href="Print.aspx?StartDate=2009-01-01">Print</a>

I will update the demo so it will work this way.

Thanks Dan

Had hoped on a simpler solution, because the calendar I have is very dynamic for everyone of the 2000 users in the school, so with a new page I have to keep strict track of all the choises made...

After some experimenting, I've found a workaround. The following code prompts the user to open/save the image. This makes it printable from IE as well.

        Response.Clear();
        Response.ContentType = "image/png";
        Response.AddHeader("content-disposition", "attachment;filename=print.png");
        MemoryStream img = DayPilotCalendar1.Export(ImageFormat.Png, 9 * hourHeight);
        img.WriteTo(Response.OutputStream);
        Response.End();

It seems that in order to print it properly directly from IE, it has to be a GET request, not POST. This could be done by encoding the current state into the URL. However, the URL length has a limit and I'm not sure if it's worth the effort at this moment.

Another, a bit more dirty solution would be to store the state in the Session under a special GUID and pass just the GUID in the URL.

Both these alternative solutions would need a special method for serialization/deserialization of the control state.