onKeyDown and onKeyUp doesnot working [Resolved]

Hi,

I have a text box and want to put validation on it.My code is like :

<asp:TextBox ID="txtName" runat="server" onKeyDown="limitText(this,25);" onKeyUp="limitText(this,25);" MaxLength="25"></asp:TextBox>

function limitText(limitField, limitNum) {

if (limitField.value.length > limitNum) {
alert("my message");
limitField.value = limitField.value.substring(0, limitNum);
}
}

Here if I am using MaxLength attribute of textbox , then onKeyDown and onKeyUp are not working. I am not getting any alert.Removing MaxLength atrribute all working fine.


Any suggestion.
Thanks in advance

[Resolved]