// Fill the table with data.
    Word.Table tbl = ThisDocument.Tables[1];
    DirectoryInfo  di = new DirectoryInfo("C:\");

    // Start with row 2.
    int i = 2;

    Object beforeRow = Type.Missing;

    foreach (FileInfo fi in di.GetFiles())
    {
        tbl.Rows.Add(ref beforeRow);
        tbl.Cell(i, 1).Range.Text = fi.Name;
        tbl.Cell(i, 2).Range.Text = 
          string .Format("{0:N0}", fi.Length);
        tbl.Cell(i, 3).Range.Text = 
            string .Format("{0:g}", fi.LastWriteTime);
        i++;
    }

foreach (FileInfo fi in di.GetFiles())

foreach(DataRow row in dt.Rows)