Request Crypto API Sample?

you could search in the .NET documentation, msdn, msdn online.. there are plenty samples available... Private Shared Sub EncryptData(inName As String, outName As String, _ rijnKey() As Byte, rijnIV() As Byte) 'Create the file streams to handle the input and output files. Dim fin As New FileStream(inName, FileMode.Open, FileAccess.Read) Dim fout As New FileStream(outName, FileMode.OpenOrCreate, _ FileAccess.Write) fout.SetLength(0) 'Create variables to help with read and write. Dim bin(100) As Byte 'This is intermediate storage for the encryption. Dim rdlen As Long = 0 'This is the total number of bytes written. Dim totlen As Long = fin.Length 'Total length of the input file. Dim len As Integer 'This is the number of bytes to be written at a time. 'Creates the default implementation, which is RijndaelManaged. Dim rijn As SymmetricAlgorithm = SymmetricAlgorithm.Create() Dim encStream As New CryptoStream(fout, _ rijn.CreateEncryptor(rijnKey, rijnIV), CryptoStreamMode.Write) Console.WriteLine("Encrypting...") 'Read from the input file, then encrypt and write to the output file. While rdlen < totlen len = fin.Read(bin, 0, 100) encStream.Write(bin, 0, len) rdlen = Convert.ToInt32(rdlen + len) Console.WriteLine("{0} bytes processed", rdlen) End While encStream.Close() fout.Close() fin.Close() End Sub System.Security.Cryptography is the namespace to be included within your C# code