private void ClearInput()
{
Firstname.Clear();
_Name.Clear();
Secondname.Clear();
comboBox1.SelectedIndex = 0;
Ball.Clear();
City.Clear();
Street.Clear();
Build.Clear();
Flat.Clear();
Group.Value = 1;
Course.Value = 1;
radioButton1.Checked = false;
radioButton2.Checked = false;
label16.Text = "1";
label15.Text = "1";
}
