public void openBinaryFile() { OpenFileDialog openFileDialog = new OpenFileDialog(); openFileDialog.FileName = "users.bin"; openFileDialog.DefaultExt = ".bin"; openFileDialog.Filter = "Binar documents (.bin)|*.bin"; var result = openFileDialog.ShowDialog(); if (result == true) { PublicUsers.Clear(); PublicUsers = writer.Read(openFileDialog.FileName); addDataToUsers(); } }