<script type="text/javascript">
function isNumber(evt) {
evt = (evt) ? evt : window.event;
var charCode = (evt.which) ? evt.which : evt.keyCode;
if (charCode > 31 && (charCode < 48 || charCode > 57)) {
alert("enetr numbers");
return false;
}
return true;
}
function Button1_onclick() {
var a = document.getElementById('TextBox1').value;
var b = document.getElementById('TextBox2').value;
if (b < a) {
alert('Maxsal is should be greater than minsal');
return true;
}
else {
return false;
}
}
</script>
</head>
<body>
<form runat="server">
<asp:TextBox ID="TextBox1" runat="server" onkeypress="return isNumber(event)"></asp:TextBox>
<asp:TextBox ID="TextBox2" runat="server" onkeypress="return isNumber(event)" OnTextChanged="Button1_onclick()"></asp:TextBox>
</form>
</body>
</html>