System.Security.Cryptography.CryptographicException The system cannot find the file specified

Error Details: System.Security.Cryptography.CryptographicException The system cannot find the file specified

New Security constraints that were included into the windows server 2008, and a new user CryptoGraphic Operator will be created by default. If your Application is using RSACryptoServiceProvider on windows server 2008 with IIS 7, you can troubleshoot above issue through these steps easily.

1. INETMGR (IIS 7) > Application Pools > YourApplicationPool > (Right Click) Advanced Settings > Set the Value of “Load User Profile” to “TRUE“

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Protecting ASP.Net Page from Browser’s Back Button Press

You can make your ASP.Net pages protected from browser back button press, while your data is not yet saved or to ensure the security of transactional data, eg: online banking, cms

You have to place the code inside ‘Page_Load‘

example:

protected void Page_Load(object sender, EventArgs e)

{

//Empty Browser Cache on Back button Press

Response.Cache.SetExpires(DateTime.Parse(DateTime.Now.ToString()));

Response.Cache.SetCacheability(HttpCacheability.Private);

Response.Cache.SetNoStore();

Response.AppendHeader(“Pragma”, ”no-cache”);

}

Protecting ASP.Net Page From Back button press

You can make your ASP.Net pages protected from browser back button press, while your data is not yet saved or to ensure the security of transactional data, eg: online banking, cms

You have to place the code inside ‘Page_Load’

example:

protected void Page_Load(object sender, EventArgs e)

{

//Empty Browser Cache on Back button Press

Response.Cache.SetExpires(DateTime.Parse(DateTime.Now.ToString()));

Response.Cache.SetCacheability(HttpCacheability.Private);

Response.Cache.SetNoStore();

Response.AppendHeader(“Pragma”, “no-cache”);

}

A potentially dangerous Request.Form value was detected from the client

.net framework is throwing an error because it detected some html contents in submitted text. to solve this error you have to add

ValidateRequest=”false” on top of your code.

Example:
<%@ Page Title=”" Language=”C#” ValidateRequest=”false” MasterPageFile=”~/Pages.Master” AutoEventWireup=”true” CodeBehind=”AddArticle.aspx.cs” Inherits=”_AddArticle” %>

MenonOnNet is Back Now!!!!

hi  friends!,

After a long time MenonOnNet is back to action. All the broken links in this blog will be update soon within a max of 3 days.

If you have any queries you can reach me on my email menononnet[at]gmail.com

regards,

Menon Kalipurayath

MenonOnNet – a complete .net resource

Password Encryption Using ASP.Net

Password Encryption can be used for encrypting password. Here in this article I am going to explain how you can create the hashed passwords. This method can be used for storing passwords in the credentials section of a database or inside an XML file.

Some of commonly used Hash Encryption Algorithms are ‘MD5‘ and ‘SHA-1‘

SHA-1 (Secure Hash Algorithm 1) is slower than MD5 but the message digest is larger, which makes it more resistant to brute force attacks. Therefore, it is recommended that Secure Hash Algorithm is preferred to MD5 for all of your digest needs.

Creating Hashed Passwords Using “SHA-1″ (Secure Hash Algoritham)

• Source Code “VB.NET”

  Dim strEncryptPassword As String
  strEncryptPassword = FormsAuthentication.HashPasswordForStoringInConfigFile(txtPassword.Text, “sha1″)

• Source Code “C#”

  {
  string strEncryptPassword;
  strEncryptPassword = FormsAuthentication.HashPasswordForStoringInConfigFile(txtPassword.Text, “sha1″);
  }

Asp.Net Flv Converter Beta Version

Your Waiting for the Free Online FLV Converter is going to over… MenonOn.Net planning to launch the “On The Fly” FLV Converter by the end of July 2008.

Menon FLV Converter is an On the FLY FLV Converter for ASP.Net Video Streaming Portal Websites. It will convert video files to the flv format.

Beta version of Menon FLV Converter is still under testing… We need your suggestions about this. So kindly post your comments or mail me on menononnet@gmail.com

Forms Authentication timeout in ASP.NET

Asp.Net the forms authentication timeout value by default is 30 Minutes, this means after 30 minutes of inactivity the application will redirect user to the login page again

You can change the timeout value by modifying the web.config

for example:

<authentication mode=”Forms”>
<forms name=”.ASPXFORMSDEMO” loginUrl=”./logon.aspx” protection=”All” path=”/” timeout=”2400″ />
</authentication>

Flash Components for ASP.Net & PHP Websites

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