MS Word Document Page count

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.NET

I'm using following function to get the page count but observed the file is getting opened. Actually I'm trying to get only page count by passing the file.

private int getPagecount(string filepath)
{
string MyFileName = filepath;

string execPath = Path.GetDirectoryName(Assembly.GetExecutingAssembly().CodeBase);
var filePath = Path.Combine(execPath, MyFileName);

Microsoft.Office.Interop.Word.Application app = new Word.Application();
Microsoft.Office.Interop.Word.Document doc = app.Documents.Open(filePath);
Word.WdStatistic stat = Word.WdStatistic.wdStatisticPages;
object missing = System.Reflection.Missing.Value;
int num= doc.ComputeStatistics(stat, ref missing);

doc.Close();
doc = null;
return num;

}

Advance Thanks.