private void DeleteButton_Click(object sender, EventArgs e) { Exam exam = getSelectedItem(); if (exam == null) { return; } if (MessageBox.Show("Biztosan ki szeretnéd törötlni a vizsgát? " + exam.Title, "Törlés", MessageBoxButtons.YesNo, MessageBoxIcon.Warning) != DialogResult.Yes) { return; } DeleteButton.Enabled = false; WebRequest.DeleteExam(exam.Id, (res) => { MessageBox.Show(res.ToString(), "Delte", MessageBoxButtons.OK, MessageBoxIcon.Information); Reload(); }); }