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Project Description
The Scrypt enahnced cryptography library provides additional cryptographic capabilities for Microsoft Silverlight 3+. In this initial release we've added RSA Encryption with support for key sizes from 256-bit to 4096-bit.

This library is fully compatible with .NET's built in RSACryptoServiceProvider.

For some usage examples, please visit my blog:
post/Asymmetric-Encryption-and-Signing-with-RSA-in-Silverlight.aspx

Limitations
This library limits the allowed key size to the range of 256-bit to 4096-bit. This is strictly due to the functionality of the employed BigInteger class that is used which initializes a fixed array for data storage. While this size can be increased to allow for larger keys, I found the negative impact on performance to be unacceptable. Likewise, I performed a full conversion of the BigInteger class to utilize generics instead of fixed arrays but the performance impact of this approach was also unacceptable.

Read more: Codeplex

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Tags: Security, Silverlight

I know this post sound basic to most of people but still lots of people does not know this. So I decided to post a blog post for this. Both int.Parse and Convert.ToInt32 are used to convert string into the integer but Only difference between them is to Convert.ToInt32 handle null and returns ‘0’ as output and int.parse is not going to handle NULL and will give a Argument Null Exception. Here is the example for that both are almost same except handling null.

           string convertToInt = "12";
          string nullString = null;
          string maxValue = "32222222222222222222222222222222222";
          string formatException = "12.32";
          int parseResult;
          // It will perfectly convert interger
          parseResult= int.Parse(convertToInt);
          // It will raise Argument Null Exception
          parseResult= int.Parse(nullString);
          //It willl raise Over Flow Exception
          parseResult= int.Parse(maxValue);
          //It will raise Format Exception
          parseResult= int.Parse(formatException);

          //For Convert.ToInt32
     
          //It will perfectly convert integer
          parseResult= Convert.ToInt32(convertToInt);
          //It will ouput as 0 if Null string is there
          parseResult= Convert.ToInt32(nullString);
          //It will raise Over Flow Exception
          parseResult= Convert.ToInt32(maxValue);
          //It will raise Format Exception
          parseResult= Convert.ToInt32(formatException);

Read more: DOTNET JAPS

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Tags: .NET

A few days ago a friend emailed me the following question regarding NHibernate mappings for a solution he’s currently developing:

“I have an idea entity that has a collection of comment entities and I need to get the comment count for each idea. I made a massive mistake at the beginning by calling idea.Comments.Count (even worse, I did it in the view!), which due to the collection being lazy-loaded caused about 10 database calls so performance was sluggish even with second level cache.  I was therefore wondering how you would do it - would you use HQL and use Comments.size or would you do something differently?”
Now, I’ve been pretty busy recently, so before I had opportunity to respond properly, he sent this follow-up:

"After looking for a solution for getting a Comment count back for each Idea, I found using the Nhibernate Formula method does the job - just wanting to make sure I was on the right track in terms of performance etc.  My mapping class is as follows:"

public class IdeaMap : ClassMap<Idea>
{}
}

Read more: Ian Nelson