Javascript validation for input limited text into textbox or textarea in ASP.NET

Javascript validation for input limited text into textbox or textarea
On design page source::
----------------------------



On b/h code source page:
protected void Page_Load(object sender, EventArgs e)
{
txtLocation.Attributes.Add("onkeypress", "return LocationLength()");
txtLocation.Attributes.Add("onkeyup", "return LocationLength()");
}

Happy Coding..!!