private void ClearALL()
{
ZNO1Name.Clear();
ZNO2Name.Items.Clear();
ZNO3Name.Clear();
AtestatInput.Clear();
ZNO1Mark.Value = 100;
ZNO2Mark.Value = 100;
ZNO3Mark.Value = 100;
ZNO4Mark.Value = 100;
}
private void RemoveAllspreadsheets()
{
ZNO1Name.Clear();
ZNO3Name.Clear();
ZNO2Name.Items.Clear();
ZNO1Mark.Value = 100;
ZNO2Mark.Value = 100;
ZNO3Mark.Value = 100;
ZNO4Mark.Value = 100;
koef1.Value = 0;
koef2.Value = 0;
koef3.Value = 0;
AtestatKoef.Value = 0;
Verdict.BackColor = Color.DarkSeaGreen;
Verdict.Text = null;
rezultbox.Clear();
}