how encrypt connection string in asp.net 3.5

using System;
using System.Security.Cryptography;
using System.IO;
using System.Text;
 
 
 
 
    public class Cryptography
    {
        #region "Varible declaration"
        readonly static String passPhrase = "(`!M@#I*#L&$I^%.N:a;D#^)/";
        readonly static String saltValue = "/(:;A.`>~!M*@;&#I^^$%N%)";
        readonly static String hashAlgorithm = "SHA1";
        readonly static Int32 passwordIterations = 101;
        readonly static String initVector = "$MjHyUhVvGcTreM$";
        readonly static Int32 keySize = 256;
        #endregion
 
        public Cryptography() { }
 
        #region "internal Static Decryption Method."
 
		public static String Decrypt(string Value)
        {
            byte[] keyBytes, cipherTextBytes, saltValueBytes, initVectorBytes;
            PasswordDeriveBytes Password;
            RijndaelManaged symmetricKey = new RijndaelManaged();
            MemoryStream MemoryStream;
            ICryptoTransform Decryptor;
            CryptoStream cryptoStream;
            int decryptedByteCount;
            string DecVal;
            byte[] plainTextBytes = new byte[1];
            try
            {
                initVectorBytes = Encoding.ASCII.GetBytes(initVector);
                saltValueBytes = Encoding.ASCII.GetBytes(saltValue);
                cipherTextBytes = Convert.FromBase64String(Value);
                Password = new PasswordDeriveBytes(passPhrase, saltValueBytes, hashAlgorithm, passwordIterations);
                keyBytes = Password.GetBytes(keySize / 8);
                symmetricKey.Mode = CipherMode.CBC;
                Decryptor = symmetricKey.CreateDecryptor(keyBytes, initVectorBytes);
                MemoryStream = new MemoryStream(cipherTextBytes);
                cryptoStream = new CryptoStream(MemoryStream, Decryptor, CryptoStreamMode.Read);
                Array.Resize(ref plainTextBytes, cipherTextBytes.Length);
                decryptedByteCount = cryptoStream.Read(plainTextBytes, 0, plainTextBytes.Length);
                MemoryStream.Close();
                cryptoStream.Close();
                DecVal = Encoding.UTF8.GetString(plainTextBytes, 0, decryptedByteCount);
            }
            catch (Exception ex)
            {
                throw new Exception("<center><font color=red><h2>" + ex.Message + "</h2></font></center>");
            }
            return DecVal.ToString();
        }
        #endregion
 
        #region "internal Static Encryption Method."
 
		public static String Encrypt(string Value)
        {
            string EncVal;
            byte[] cipherTextBytes, keyBytes, plainTextBytes, initVectorBytes, saltValueBytes;
            PasswordDeriveBytes Password;
            ICryptoTransform Encryptor;
            CryptoStream cryptoStream;
            RijndaelManaged symmetricKey = new RijndaelManaged();
            MemoryStream memoryStream = new MemoryStream();
            try
            {
                initVectorBytes = Encoding.ASCII.GetBytes(initVector);
                saltValueBytes = Encoding.ASCII.GetBytes(saltValue);
                plainTextBytes = Encoding.UTF8.GetBytes(Value);
                Password = new PasswordDeriveBytes(passPhrase, saltValueBytes, hashAlgorithm, passwordIterations);
                keyBytes = Password.GetBytes(keySize / 8);
                symmetricKey.Mode = CipherMode.CBC;
                Encryptor = symmetricKey.CreateEncryptor(keyBytes, initVectorBytes);
                cryptoStream = new CryptoStream(memoryStream, Encryptor, CryptoStreamMode.Write);
                cryptoStream.Write(plainTextBytes, 0, plainTextBytes.Length);
                cryptoStream.FlushFinalBlock();
                cipherTextBytes = memoryStream.ToArray();
                memoryStream.Close();
                cryptoStream.Close();
                EncVal = Convert.ToBase64String(cipherTextBytes);
            }
            catch (Exception ex)
            {
                throw new Exception("<center><font color=red><h2>" + ex.Message + "</h2></font></center>");
            }
            return EncVal.ToString();
        }
        #endregion
    }
                                              

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