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Hide Label Automatically after some seconds using JavaScript

Introduction

 
Open Visual Studio and create a new project and select the Web template from the list and select ASP.NET Empty Web Application. Enter the name of your application and click on OK.
 
Right-click on the project and select Add -> Web Form and name it as Home.aspx.
 
Now Drag and drop one TextBox, a Button, and a Label on the Home.aspx page. 
 
Paste the following JavaScript function in the head section of the Home.aspx page.
  1. <script type="text/javascript">  
  2.     window.onload = function ()  
  3.     {  
  4.         var seconds = 5;  
  5.         setTimeout(function () {  
  6.             document.getElementById("<%=displaymessage.ClientID %>").style.display = "none";  
  7.     }, seconds * 1000);  
  8. };  
  9. </script>  
Here I am hiding the Label after 5 seconds. 
 
Below is the code to make the label visible when Submit Form button is clicked.
  1. protected void OnClickSubmitButton(object sender, EventArgs e)  
  2. {  
  3.    displaymessage.Visible = true;  
  4. }  
ASPX Page Code
  1. <%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Home.aspx.cs" Inherits="HideLabelAutomatically.Home" %>  
  2.   
  3. <!DOCTYPE html>  
  4.   
  5. <html xmlns="http://www.w3.org/1999/xhtml">  
  6. <head runat="server">  
  7.     <title>HideLabelAutomatically</title>  
  8.     <script type="text/javascript">  
  9.         window.onload = function ()  
  10.         {  
  11.             var seconds = 5;  
  12.             setTimeout(function () {  
  13.                 document.getElementById("<%=displaymessage.ClientID %>").style.display = "none";  
  14.         }, seconds * 1000);  
  15.     };  
  16.     </script>  
  17. </head>  
  18. <body>  
  19.     <form id="form1" runat="server">  
  20.         <div>  
  21.             Enter Name:  
  22.             <asp:TextBox ID="Name" runat="server" />  
  23.             <br />  
  24.             <br />  
  25.             <asp:Button ID="submitbutton" Text="Submit Form" runat="server" OnClick="OnClickSubmitButton" />  
  26.             <br />  
  27.             <br />  
  28.             <asp:Label ID="displaymessage" ForeColor="Green" Font-Bold="true" Text="Form has been submitted successfully." runat="server" Visible="false" />  
  29.         </div>  
  30.     </form>  
  31. </body>  
  32. </html>  
Output