private void LoadProblemsDirectory(string dir)
{
if (IsGrading)
{
throw new JudgeIsGradingException();
}
judgeModel.RemoveAllProblems();
problemModel.LoadProblemsDirectory(dir);
List <string> problems = problemModel.GetListProblemnames();
judgeModel.BeginTransaction();
foreach (string problem in problems)
{
judgeModel.InsertProblem(problem);
}
judgeModel.EndTransaction();
RemoveAllSubmission();
}