numbers only textbox code example

Example 1: accept only numbers in textbox

<input type="text" onkeypress="return isNumberKey(event)" placeholder="Phone Number">
//this will accept only numbers from 0 to 9
<script>
function isNumberKey(evt)
{
	var charCode = (evt.which) ? evt.which : event.keyCode
	if (charCode > 31 && (charCode < 48 || charCode > 57))
	return false;

	return true;
}
</script>

Example 2: windows form textbox numbers only

private void textBox1_TextChanged(object sender, EventArgs e)
{
    if (System.Text.RegularExpressions.Regex.IsMatch(textBox1.Text, "[^0-9]"))
    {
        MessageBox.Show("Please enter only numbers.");
        textBox1.Text = textBox1.Text.Remove(textBox1.Text.Length - 1);
    }
}

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