private void Btn_OpenGrid_Click(object sender, EventArgs e)
{
var op = new OpenFileDialog();
op.Filter = "avlsdk files (*.avlsdk)|*.avlsdk";
op.ShowDialog();
if (File.Exists(op.FileName))
{
new SudokuForm(SudokuFileReader.ReadGridCode(File.ReadAllText(op.FileName)), op.FileName).Show();
}
}
