Textbox Validation

<............onKeyDown="var lilKey=event.keyCode; if(lilKey==48){return true} else if(lilKey >=49&&lilKey<=57){return true}else{alert('Numbers only!');return false;}">





Drag a textbox onto aspx page, copy and paste onKeyDown event. This will validate your input to the textbox and only numbers can be entered into the textbox not characters. Try it.