Cannot convert from 'string' to 'ref object' ?

Hi to everybody

I have a method like this

public bool stduy(string filename)
{
int max = 500;
Word.ApplicationClass wordApp = new Word.ApplicationClass();
object file = filename;
object readOnly = false;
object isVisible = false;
object miss = System.Reflection.Missing.Value;
Word.Document doc = wordApp.Documents.Open(filename, ref miss,ref readOnly, ref miss, ref miss, ref miss, ref miss, ref miss, ref miss, ref miss, ref miss, ref isVisible);
Word.WdStatistic countedWords = Word.WdStatistic.wdStatisticWords;

int num = doc.ComputeStatistics(countedWords, ref miss);
if (num > max)
{
return false;
}
else
{
return true;
}
}

and when i build it, says Cannot convert from 'string' to 'ref object' , so where might i have made a mistake?

Thanks

Please use the [code][/code] tags.

You've passed filename instead of ref file in the first parameter of the call to Word.Documents.Open.

Sorry i forgot to use tags. And thanks for the help