string str =
                            @"Provider=microsoft.jet.oledb.4.0;Data source="+
                            Path.GetDirectoryName(dataGridView1[ 5 , dataGridView1.CurrentRow.Index].Value.ToString())+
                @";Extended properties=""text;hdr=no;fmt=delimited""";
                OleDbConnection oleDbCon = new OleDbConnection(str);
                OleDbDataAdapter da = new OleDbDataAdapter(@"Select * from [" +
                Path.GetFileName(dataGridView1[ 5 ,dataGridView1.CurrentRow.Index].Value.ToString()) + 
                @"]", str);
                
                DataTable dt=new DataTable("tFile");
                da.Fill(dt);
                dataGridView.DataSource = dt.DefaultView;