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Use System.Security.Cryptograp<wbr />hy.Rijndae<wbr />lManaged &nbsp;If you want examples, search MSDN
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Use System.Security.Cryptography.RijndaelManaged  If you want examples, search MSDN

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First step - do not try to code it yourself.<br />
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This has already been done many times, in many libraries. &nbsp;If you do not understand the finer points of encryption, salting values, keys etc then you will make mistakes and end up with very easy to crack encryption.<br />
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Google it and reuse code that already exists and is published :<br />
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<a href="https://www.google.com/search?q=c%23+aes+encryption" rel="ugc">https://www.google.com/search?q=c%23+aes+encryption</a>
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First step - do not try to code it yourself.

This has already been done many times, in many libraries.  If you do not understand the finer points of encryption, salting values, keys etc then you will make mistakes and end up with very easy to crack encryption.

Google it and reuse code that already exists and is published :

https://www.google.com/search?q=c%23+aes+encryption [https://www.google.com/search?q=c%23+aes+encryption]

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How will i use AES algorithm in C# to encrypt and decrypt a string
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How will i use AES algorithm in C# to encrypt and decrypt a string

AES algorithm

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C# is an object-oriented programming language created in conjunction with Microsoft’s .NET framework. Compilation is usually done into the Microsoft Intermediate Language (MSIL), which is then JIT-compiled to native code (and cached) during execution in the Common Language Runtime (CLR).