I have created calendar list using visual studio 2013 with two views in List Instance. Now i want to create some calendar overlays using same views i have created in list instance.

Please help me to create calendar overlay using visual studio list instance.

I can achieve through SharePoint UI but i need solution to achieve the same using VS list instance.

  • it is not possible – Rajesh Joshi Jul 8 '15 at 10:58
  • it is possible using SharePoint UI So there must be any way to achieve this. – Hardik Jul 8 '15 at 10:59
  • 1
    yes, you can do it with UI but cant do it with Instance – Rajesh Joshi Jul 8 '15 at 13:12

What does OP mean by instance? List definition in XML? In that case maybe not, but there is code for that which I have successfully used many a time. Just stick that in an event receiver and you're good to go:

public static void AddCalendarOverlay(SPList targetList, string viewName, SPList overlayList, string overlayListView, string overlayName, string overlayDescription, CalendarOverlayColor color, bool alwaysShow, bool clearExisting)
    bool sharePoint = overlayList != null;

    SPView overlayView = overlayList.DefaultView;
    if (!string.IsNullOrEmpty(overlayListView))
        if (overlayList.Views[overlayListView] != null)
            overlayView = overlayList.Views[overlayListView];

    string linkUrl = overlayView.ServerRelativeUrl;

    SPView targetView = targetList.DefaultView;
    if (!string.IsNullOrEmpty(viewName))
        if (targetList.Views[viewName] != null)
            targetView = targetList.Views[viewName];

    XmlDocument xml = new XmlDocument();
    XmlElement aggregationElement = null;
    int count = 0;
    if (string.IsNullOrEmpty(targetView.CalendarSettings) || clearExisting)
        aggregationElement = xml.CreateElement("AggregationCalendar");
        XmlNodeList calendars = xml.SelectNodes("/AggregationCalendars/AggregationCalendar");
        if (calendars != null)
            count = calendars.Count;
        aggregationElement = xml.SelectSingleNode(string.Format("/AggregationCalendars/AggregationCalendar[@CalendarUrl='{0}']", linkUrl)) as XmlElement;
        if (aggregationElement == null)
            if (count >= 10)
                throw new SPException(string.Format("10 calendar ovarlays already exist for the calendar {0}.", targetList.RootFolder.ServerRelativeUrl));
            aggregationElement = xml.CreateElement("AggregationCalendar");
    if (!aggregationElement.HasAttribute("Id"))
        aggregationElement.SetAttribute("Id", Guid.NewGuid().ToString("B", CultureInfo.InvariantCulture));

    aggregationElement.SetAttribute("Type", sharePoint ? "SharePoint" : "Exchange");
    aggregationElement.SetAttribute("Name", !string.IsNullOrEmpty(overlayName) ? overlayName : (overlayList == null ? "" : overlayList.Title));
    aggregationElement.SetAttribute("Description", !string.IsNullOrEmpty(overlayDescription) ? overlayDescription : (overlayList == null ? "" : overlayList.Description));
    aggregationElement.SetAttribute("Color", ((int)color).ToString());
    aggregationElement.SetAttribute("AlwaysShow", alwaysShow.ToString());
    aggregationElement.SetAttribute("CalendarUrl", linkUrl);

    XmlElement settingsElement = aggregationElement.SelectSingleNode("./Settings") as XmlElement;
    if (settingsElement == null)
        settingsElement = xml.CreateElement("Settings");
    if (sharePoint)
        settingsElement.SetAttribute("WebUrl", overlayList.ParentWeb.Site.MakeFullUrl(overlayList.ParentWebUrl));
        settingsElement.SetAttribute("ListId", overlayList.ID.ToString("B", CultureInfo.InvariantCulture));
        settingsElement.SetAttribute("ViewId", overlayView.ID.ToString("B", CultureInfo.InvariantCulture));
        settingsElement.SetAttribute("ListFormUrl", overlayList.Forms[PAGETYPE.PAGE_DISPLAYFORM].ServerRelativeUrl);

    targetView.CalendarSettings = xml.OuterXml;

Most of the code is self-explanatory, but if you need any clarification I will be happy to help.

| improve this answer | |
  • Thanks for reply & your efforts but i had completed it long time back....:) – Hardik Feb 19 '16 at 10:24
  • Still, some users might find it useful :) – Paul Strupeikis Feb 19 '16 at 10:26
  • Yes you are right.. that's why i appreciated your effort by up-vote the answer. as i know we can do it by this way well. Thanks Again Man..:) – Hardik Feb 19 '16 at 10:29

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