waiting for acrobat to load : CSharp

I'm calling acrobat to open through code:
FileInfo fi = new FileInfo(filePath);
Type AcrobatAppType;
AcrobatAppType = Type.GetTypeFromProgID("AcroExch.App");
Acrobat.CAcroApp oAdobeApp = (Acrobat.CAcroApp)Activator.CreateInstance(AcrobatAppType);

Type AcrobatPDDocType;
AcrobatPDDocType = Type.GetTypeFromProgID("AcroExch.PDDoc");
Acrobat.CAcroPDDoc oAdobePDDoc = (Acrobat.CAcroPDDoc)Activator.CreateInstance(AcrobatPDDocType);
oAdobePDDoc.Open(filePath);
int pdfPages = 1 + oAdobePDDoc.GetNumPages();

Type AcrobatAvType;
AcrobatAvType = Type.GetTypeFromProgID("AcroExch.AVDoc");
Acrobat.CAcroAVDoc oAdobeAVDoc = (Acrobat.CAcroAVDoc)Activator.CreateInstance(AcrobatAvType);
oAdobeApp.Show();
oAdobeAVDoc.Open(filePath, filebatesThis);
oAdobeAVDoc.BringToFront();
oAdobeAVDoc.GetTitle();
oAdobeApp.MenuItemIsEnabled("SelectAll");
oAdobeApp.MenuItemIsEnabled("Copy");

"THEN"

try
{
oAdobeApp.MenuItemExecute("SelectAll");
oAdobeApp.MenuItemExecute("Copy");
}
catch (Exception selectCopy)
{
MessageBox.Show(selectCopy.ToString());
}


My problem is that some of my PDF files are HUGE and the program I am running moves beyond this step before the file is loaded. Is there some way for me to wait for the program to load other than system.threading.wait??? I mean, that is iffy at best. I was thinking maybe I can create an instance of a process and attach the acrobat.exe that is running to that process and do a process.waitforidle, but I don't know 1, if that will work because 2, i don't know how to code it right. any help would be supah!