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private void textBox1_KeyDown(object sender, KeyEventArgs e)
{
if (e.Key != Key.Back && e.Key < Key.D0 || e.Key > Key.D9 && e.Key < Key.NumPad0 || e.Key > Key.NumPad9)
{
e.Handled = true;
}
}
private void textBox1_KeyDown(object sender, KeyEventArgs e)
{
if ((e.KeyChar < 48 || e.KeyChar > 57) && e.KeyChar != 8)
{
e.Handled = true;
}
}
private void textBox1_KeyDown(object sender, KeyPressEventArgs e)
{
if (!char.IsDigit(e.KeyChar) && !char.IsControl(e.KeyChar))
{
e.Handled = true;
}
}
e.KeyChar == (char)Keys.Enter