Outlook 2010 integration using VS2010

Good Day

I am trying to export contacts to Excel using Outlook 2010 and VS 2010. However all code examples are related to VS2008 and Outlook 2007. I am new to the .NET environment and would like to know if someone could point me in the right direction. I have created a function AccessContacts that i just want to step through the contact list and filter out Category = Business Contacts and then i will have to export it to excel CSV...... I have attached my function which does work in Outlook 2007 for some reason:( Hope someone can help......

private void AccessContacts(string findCatName)
{
Outlook.MAPIFolder folderContacts = this.Application.ActiveExplorer().Session.
GetDefaultFolder(Outlook.OlDefaultFolders.olFolderContacts);
Outlook.Items searchFolder = folderContacts.Items;
int counter = 0;
foreach (Outlook.ContactItem foundContact in searchFolder)
{
if (foundContact.FirstName.Contains(findCatName))
{
foundContact.Display(false);
counter = counter + 1;
}
}
MessageBox.Show("You have " + counter +
" contacts with last names that contain "
+ findCatName + ".");
}