Adding a schema to an XML document using DOM through C++/CLI

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C++

C#

XML

Has anyone browsed a folder for a schema to add to an XML document stored in DOM, then added that schema to the document and successfully validated the document with it, or included a URL for a default namespace/schema on a new document?

Neither samples listed here actually work.

Get_Schema();
 tmpstr = DocNamespace;

 tmpstr +=" ";
 tmpstr += SchemaName;

att = doc->CreateAttribute("xsi:schemaLocation");
att->Value = tmpstr;
node->Attributes->Append(att);

void Get_Schema()
{
    OpenFileDialog^ openfiledialog = gcnew OpenFileDialog();
    openfiledialog->DefaultExt = L"xsd";


    if (openfiledialog->ShowDialog() ==  System::Windows::Forms::DialogResult::OK)
    {
        SchemaName = openfiledialog->FileName;
        SchemaBar->Text = "Schema: " + SchemaName;

        try
        {
          doc->Schemas->Add(DocNamespace,SchemaName);
        }
        catch (Exception ^e)
        {
          MessageString = "Error adding schema: " + e->Message;
          MessageBox::Show(MessageString);
        }
    }
}

And here's an effort to add a default schema to a new document:

             if (ArgList->Last == nullptr)
             {
                 XmlNode ^tmp;
                 XmlAttribute ^att;
                 String ^tmpstr;
                 tmp = ArgDoc->CreateXmlDeclaration("1.0","UTF-8","");
                 ArgDoc->AppendChild(tmp);
                 tmp = ArgDoc->CreateComment("Test XML created by IE315_Editor");
                 ArgDoc->AppendChild(tmp);

                 att = ArgDoc->CreateAttribute("xmlns");
                 att->Value = "http://www.gph.ie/schemas/ics/IE315/v1";
                 ArgChild->Attributes->Append(att);

                 att = ArgDoc->CreateAttribute("xmlns:xsi");
                 att->Value =  "http://www.w3.org/2001/XMLSchema-instance";
                 ArgChild->Attributes->Append(att);

                 tmpstr = "http://www.gph.ie/schemas/ics/IE315/v1"; // the namespace
                 DocNamespace = tmpstr;
                 //V1.04 - Add the new namespace to the document
                 nsmgr = gcnew XmlNamespaceManager (ArgDoc->NameTable);
                 nsmgr->AddNamespace(L"xsi","http://www.w3.org/2001/XMLSchema-instance");

                 namespace_found = true;
                 // if there is no local schema specified, include a default.
                 if (SchemaName == "")
                 {
                     tmpstr +=  " http://gphost2:38711/xmlreferencesite/customs/ics/IE315-EntrySummaryDeclaration/v1/schema.xsd";
                     SchemaBar->Text = "Schema: http://gphost2:38711/xmlreferencesite/customs/ics/IE315-EntrySummaryDeclaration/v1/schema.xsd";
                     SchemaName = "http://gphost2:38711/xmlreferencesite/customs/ics/IE315-EntrySummaryDeclaration/v1/schema.xsd";
                     // V1.04 Addition of DEBUG_SCHEMA
#ifdef DEBUG_SCHEMA
                     MessageString = "NOTE: Using DEBUG Schema!!!";
                        MessageBox::Show(MessageString);
                     //C:/GPH/Schemas/IE315/v1/schema.xsd
                     tmpstr +=  " C:/GPH/Schemas/IE315/v1/schema.xsd";
                     SchemaBar->Text = "Schema: C:/GPH/Schemas/IE315/v1/schema.xsd";
                     SchemaName = "C:/GPH/Schemas/IE315/v1/schema.xsd";
#endif

                     // V1.04
                     //XmlSchemaCollection^ xsc = gcnew XmlSchemaCollection;
                     //xsc->Add(DocNamespace, SchemaName);
                     ArgDoc->Schemas->Add(DocNamespace,SchemaName);
                     ArgDoc->Schemas->ValidationEventHandler+=eventHandler;
                     nsmgr->AddNamespace(L"ie", DocNamespace);


                     schema_found = true;
                 }