How to integration PST/OST file with C#

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Outlook

C#5.0

PST/OST file integration with C# Issue
Posted on: 08 Oct 2014
I am using Microsoft.Office.Interop.Outlook Version 12.0.0.0 to read my outlook pst file but when compiler reaches this code outlookNs.AddStore(pstFilePath); it gives exception that “The Outlook data file (.pst) failed to load for this session.” i have triedoutlookNs.AddStoreEx(pstFilePath); also but the error was same ….any sugession ??
NOT ABLE TO READ PST/OST FILE THROUGH C#

Here I pass PST File Path & Name

IEnumerable<mailitem> mailItems = readPst(strSource[0].ToString(), strSource[1].ToString()); 

Here is the Method

private static IEnumerable<mailitem> readPst(string pstFilePath, string pstName)
{
List<mailitem> mailItems = new List<mailitem>();
try
{
Microsoft.Office.Interop.Outlook.Application app = new Microsoft.Office.Interop.Outlook.Application();
NameSpace outlookNs = app.GetNamespace("MAPI");
// Add PST file (Outlook Data File) to Default Profile
outlookNs.AddStore(pstFilePath);
MAPIFolder rootFolder = outlookNs.Stores[pstName].GetRootFolder(); 
Folders subFolders = rootFolder.Folders;
foreach (Folder folder in subFolders)
{
if (folder.Name == "Inbox")
{
Items items = folder.Items;
foreach (object item in items)
{
if (item is MailItem)
{
MailItem mailItem = item as MailItem;
mailItems.Add(mailItem);
}
}
}
} 
progressMaxVal =(int) mailItems.Count;
}
catch (System.Exception ex)
{
}
return mailItems;
}</mailitem></mailitem></mailitem>