How To Write To A OneNote 2013 Page Using C# and The OneNote Interop

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I asked the same question on MSDN forums and was given this great answer. Below is a nice, clean example of how to write to OneNote using C# and the OneNote interop. I hope that this can help people in the future.

    static Application onenoteApp = new Application();
    static XNamespace ns = null;

    static void Main(string[] args)
    {
        GetNamespace();
        string notebookId = GetObjectId(null, OneNote.HierarchyScope.hsNotebooks, "MyNotebook");
        string sectionId = GetObjectId(notebookId, OneNote.HierarchyScope.hsSections, "Sample_Section");
        string firstPageId = GetObjectId(sectionId, OneNote.HierarchyScope.hsPages, "MyPage");
        GetPageContent(firstPageId);
        Console.Read();
    }
    static void GetNamespace()
    {
        string xml;

        onenoteApp.GetHierarchy(null, OneNote.HierarchyScope.hsNotebooks, out xml);
        var doc = XDocument.Parse(xml);
        ns = doc.Root.Name.Namespace;
    }

    static string GetObjectId(string parentId, OneNote.HierarchyScope scope, string objectName)
    {
        string xml;
        onenoteApp.GetHierarchy(parentId, scope, out xml);

        var doc = XDocument.Parse(xml);
        var nodeName = "";

        switch (scope)
        {
            case (OneNote.HierarchyScope.hsNotebooks): nodeName = "Notebook"; break;
            case (OneNote.HierarchyScope.hsPages): nodeName = "Page"; break;
            case (OneNote.HierarchyScope.hsSections): nodeName = "Section"; break;
            default:
                return null;
        }

        var node = doc.Descendants(ns + nodeName).Where(n => n.Attribute("name").Value == objectName).FirstOrDefault();

        return node.Attribute("ID").Value;
    }
    static string GetPageContent(string pageId)
    {
        string xml;
        onenoteApp.GetPageContent(pageId, out xml, OneNote.PageInfo.piAll);
        var doc = XDocument.Parse(xml);
        var outLine = doc.Descendants(ns + "Outline").First();
        var content = outLine.Descendants(ns + "T").First();
        string contentVal = content.Value;
        content.Value = "modified";
        onenoteApp.UpdatePageContent(doc.ToString());
        return null;
    }

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