private void ResTxt3_KeyPress(object sender, KeyPressEventArgs e)
{
resultLbl.Text = null;
if (e.KeyChar == (char)13 && ResTxt2.Text != null)
{
if (GetResult(ResTxt1.Text, ResTxt2.Text, ResTxt3.Text, ResTxt4.Text))
{
RightFun();
}
else
{
ErrorFun();
}
}
else if (e.KeyChar < 48 || e.KeyChar > 57)
{
e.KeyChar = (char)0;
resultLbl.Text = "введите цифру";
ResTxt3.Focus();
}
else if (e.KeyChar > 47 && e.KeyChar < 58)
{
ResTxt4.Focus();
}
}
private void ResTxt4_Click(object sender, EventArgs e)
{
ResTxt4.Clear();
}