private void button3_Click(object sender, EventArgs e)
{
var scheduleEditWindow = new ScheduleEdit();
// mmForm.Close();
scheduleEditWindow.ShowDialog();
}
private void button1_Click(object sender, EventArgs e)
{
string groupName = txtGroupName.Text;
string fieldOfStudy = txtFieldOfStudy.Text;
var activeAddForm = new ScheduleAdd();
var editForm = new ScheduleEdit(groupName, fieldOfStudy);
Form.ActiveForm.Close();
editForm.ShowDialog();
}