Month: November 2012

How to create a secure web based project using asp.net ?

ChandradevLeave a comment

Hi

Here is the one of excellent ebook written by Troy Hunt. How to create a complete secure web based project using asp.net and what are the common mistake developer will do while developing the web application.

You can download this free ebooks from his blog

http://www.troyhunt.com/2011/12/free-ebook-owasp-top-10-for-net.html

and Ebook download Url

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How to use Local Storage and Session Storage Feature of HTML 5.0 ?

ChandradevLeave a comment


Using HTML 5.0, Webpage can store data locally within the user’s browser . Previously I was possible only by using cookie concept but there was storage problem. Many browsers have size limit of 4,096 bytes for a single cookie. But using “local Storage” we store upto 5mb data on browser.

For storing data there are 2 options available
a. Using Local storage : Store data with no expiration date.
b. Using Session Storage : Store data for one session only

Syntax for using Local Storage using Javascript


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

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <script type="text/javascript">
        function SaveData() {
            if (typeof (Storage) !== "undefined") {
                window.localStorage["myKey"] = document.getElementById("txtName").value;
                
                alert("Data has been Save in LocalStorage");
            }
            else {
                alert("Sorry this browser doesnot suppot HTML5");
            }
        }

        function FetchData() {

            document.getElementById("txtOP").value = window.localStorage["myKey"];
          
        }
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <asp:TextBox ID="txtName" runat="server" />
    <br />
    <br />
    <asp:Button ID="btnSubmit" runat="server" OnClientClick="SaveData()" Text="Submit" />

    <br />
    <br />
    <asp:Button ID="btnDisp" runat="server" OnClientClick="FetchData()" Text="Click here to Fetch Data" />
    <br /><br />
    <asp:TextBox ID="txtOP" runat="server" />
    
    </div>
    </form>
</body>
</html>

Note Syntax will same for SessionStorage.