Write in header section of page
<script type="text/javascript">
function ValidateFiled() {
if (document.getElementById("<%= txt_LeaveNOD.ClientID
%>").value == "") {
document.getElementById("<%= lbl_Msg.ClientID %>").innerHTML = "Please Enter Number of Days...!";
return false;
}
}
</script>
Write in body section of page
<asp:Button ID="btn_Save" runat="server" Text="Save" Width="15%" OnClientClick="return
ValidateFiled();"/>
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