private void Con1_KeyDown(object sender, KeyEventArgs e)
{
if (e.KeyCode == Keys.Back)
{
New4.Clear();
New4.Focus();
p = 1;
}
}
private void textBox3_TextChanged(object sender, EventArgs e)
{
if (p == 0)
{
New4.Focus();
p = 0;
}
if (p == 1)
{
p = 0;
}
}