How to read a message of class IPM.Note.SMIME.MultipartSigned in c# using CDO

[C# Programming]

I'm not able to get the body of the mail.
Below is the code snippet:

MAPI.Session oSession = new MAPI.Session();
Object vEmpty = Missing.Value;
oSession.Logon("OutLook1", vEmpty, false, false, false, false, vEmpty);
MAPI.Folder oFolder = (MAPI.Folder)oSession.Inbox;
MAPI.Messages oMsgs = (MAPI.Messages)oFolder.Messages;
MAPI.MessageFilter oFilter = (MAPI.MessageFilter)oMsgs.Filter;
oFilter.Unread = true;
MAPI.Message newMessage = (MAPI.Message)oMsgs.GetFirst(oFilter);

while (newMessage != null)
{

string text = newMessage.Text.ToString();
//text is coming as blank.


newMessage.Unread = false;
newMessage.Update(true, true);

newMessage = (MAPI.Message)oMsgs.GetNext();
}

Thanks,
Nitesh