private void btnEditEEProm_ItemClick(object sender, ItemClickEventArgs e) { OpenFileDialog ofd = new OpenFileDialog(); //ofd.Filter = "Binary files|*.bin"; ofd.Multiselect = false; if (ofd.ShowDialog() == DialogResult.OK) { // check size .. should be 4kb FileInfo fi = new FileInfo(ofd.FileName); if (fi.Length == 512) { frmEEPromEditor editor = new frmEEPromEditor(); editor.LoadFile(ofd.FileName); editor.ShowDialog(); } } }