Number Validator in Asp.Net (Not allowed to even input other than character)

[d12]

i want to use some validator other than the common asp validator, i have almost 70 fields in an application, as it is a costing calculator, i want, its fields should not accept a character, like if we press any alphabetic or non numeric character, it should not be written in the field even, i dont want page refresh, i dont want to call onkeypress events on every text field, as it makes my app slower.Thanks a lotAtif