TextBox control (ASP.NET) to accept only numeric values

Very often for data entry screens in a web-application, we have a requirement for having text-box control to accept only numeric characters.. there is no ready-made control available with available server controls.. but there are couple of simple ways in which we can achieve this kind of behavior..

1. simply use a textbox control, and put a regular expression validator on this box.. with regular expression as \d+.. and you are done..

2. use a simple javascript function to do the same, and grab the keypress event for the box..

function blockNumber(e)
{
var keychar;
var reg;
keychar = String.fromCharCode(e.keyCode);
reg = /\d/;
return reg.test(keychar);
}

this function will block user from entering any character other then numbers.. add this function call as attribute for onkeypress event...

txtMyBox.Attributes.Add("onkeypress", "return blockNumber(event);");

and you are done..

isn't this simple or what!!! :)