WebBrowser, how to open Excel's file in mode readonly?

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C#

WPF

MS-Excel

WebBrowserControl

Hi All,

I am using VS2008, C#, with WPF application (WebBrowser and Microsoft.Office.Interop.Excel)
I have a task : Hosting Excel on WPF-form in mode readonly.

How can i do this:
1. Loading Excel file in WebBrowser

Uri _uri = new Uri("FilePath");
WebBrowserExcel.Navigate(_uri);

2. In Event WebBrowserExcel_LoadCompleted

if ((WebBrowserExcel.Document as Excel.Workbook) == null) return;
   try
   {
      //Get loading WorkBook and set "Protect" for disable editing 
      _Book = WebBrowserExcel.Document as Excel.Workbook;
      _Book.Protect("", Type.Missing, Type.Missing);
        
      //Set "Protect" for disable editing to WorkSheet
       foreach (Excel.Worksheet _sheet in _Book.Sheets)
       {
           _sheet.Protect("", Type.Missing,Type.Missing,
                          Type.Missing,Type.Missing, true,Type.Missing,
                          Type.Missing, Type.Missing, Type.Missing, 
                          Type.Missing, Type.Missing,Type.Missing,
                          Type.Missing, Type.Missing, Type.Missing
                          );
        } 
    }
    .....

After this I have an Excel's MessageBox, when I try to edit file in WebBrowser. MessageBox's text:
"This Book is Protected...etc" or "This Sheet is Protected...etc"

To hide this messagebox i need to set the property

Excel.Application.DisplayAlerts = false;

3. Set property

_Book.Application.GetType().InvokeMember("DisplayAlerts", BindingFlags.SetProperty, null, _Book.Application, new object[] { false });

and have Exception :

InnerException = {"could Not set the property DisplayAlerts Application class"}

but if create Application (not get from WebBrowserExcel.Document) I can set DisplayAlerts, but I can't hosting Excel.Application into WebBrowser, only Excel's file...

Are there ways to set Excel's file readonly inside WebBrowser? or how to set 'DisplayAlerts'?

Thanks in advance, Alex...