Show and Auto close bootstrap alert messages after few seconds in Asp.Net C#

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ASPX Code:- 

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

 <html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title></title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
    <script src="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>

    <style type="text/css">
        .messagealert {
            width: 100%;
            position: fixed;
             top:0px;
            z-index: 100000;
            padding: 0;
            font-size: 15px;
        }
    </style>
    <script type="text/javascript">
        function ShowMessage(message, messagetype) {
            var cssclass;
            switch (messagetype) {
                case 'Success':
                    cssclass = 'alert-success'
                    break;
                case 'Error':
                    cssclass = 'alert-danger'
                    break;
                case 'Warning':
                    cssclass = 'alert-warning'
                    break;
                default:
                    cssclass = 'alert-info'
            }
            $('#alert_container').append('<div id="alert_div" style="margin: 0 0.5%; -webkit-box-shadow: 3px 4px 6px #999;" class="alert fade in ' + cssclass + '"><a href="#" class="close" data-dismiss="alert" aria-label="close">&times;</a><strong>' + messagetype + '!</strong> <span>' + message + '</span></div>');

            setTimeout(function () {
                $("#alert_div").fadeTo(2000, 500).slideUp(500, function () {
                    $("#alert_div").remove();
                });
            }, 5000); //5000=5 seconds
        }
    </script>
</head>
<body>
    <form id="form1" runat="server">
        <div>
            <div class="messagealert" id="alert_container">
            </div>

             <div style="margin-top: 100px; text-align:center;">
            <asp:Button ID="btnSuccess" runat="server" Text="Submit" CssClass="btn btn-success"
                OnClick="btnSuccess_Click" />
            <asp:Button ID="btnDanger" runat="server" Text="Danger" CssClass="btn btn-danger"
                OnClick="btnDanger_Click" />
            <asp:Button ID="btnWarning" runat="server" Text="Warning" CssClass="btn btn-warning"
                OnClick="btnWarning_Click" />
            <asp:Button ID="btnInfo" runat="server" Text="Info" CssClass="btn btn-info"
                OnClick="btnInfo_Click" />
            </div>
        </div>
    </form>
</body>
</html>

Code Behind:- 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class _Default : System.Web.UI.Page
{
    public enum MessageType { Success, Error, Info, Warning };
    protected void Page_Load(object sender, EventArgs e)
    {
    }
    protected void ShowMessage(string Message, MessageType type)
    {
        ScriptManager.RegisterStartupScript(this, this.GetType(), System.Guid.NewGuid().ToString(), "ShowMessage('" + Message + "','" + type + "');", true);
    }
    protected void btnSuccess_Click(object sender, EventArgs e)
    {
        ShowMessage("Record submitted successfully", MessageType.Success);
    }
    protected void btnDanger_Click(object sender, EventArgs e)
    {
        ShowMessage("A problem has occurred while submitting data", MessageType.Error);
    }
    protected void btnWarning_Click(object sender, EventArgs e)
    {
        ShowMessage("There was a problem with your internet connection", MessageType.Warning);
    }
    protected void btnInfo_Click(object sender, EventArgs e)
    {
        ShowMessage("Please verify your data before submitting", MessageType.Info);
    }
}

Output Screenshot:-

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