This is one way of Encryption and Decryption algorithm. Its working good.

  private const string initVector = "tu89geji340t89u2";

        private const int keysize = 256;

        public static string Encrypt(string Text, string Key)
        {
            byte[] initVectorBytes = Encoding.UTF8.GetBytes(initVector);
            byte[] plainTextBytes = Encoding.UTF8.GetBytes(Text);
            PasswordDeriveBytes password = new PasswordDeriveBytes(Key, null);
            byte[] keyBytes = password.GetBytes(keysize / 8);
            RijndaelManaged symmetricKey = new RijndaelManaged();
            symmetricKey.Mode = CipherMode.CBC;
            ICryptoTransform encryptor = symmetricKey.CreateEncryptor(keyBytes, initVectorBytes);
            MemoryStream memoryStream = new MemoryStream();
            CryptoStream cryptoStream = new CryptoStream(memoryStream, encryptor, CryptoStreamMode.Write);
            cryptoStream.Write(plainTextBytes, 0, plainTextBytes.Length);
            cryptoStream.FlushFinalBlock();
            byte[] Encrypted = memoryStream.ToArray();
            memoryStream.Close();
            cryptoStream.Close();
            return Convert.ToBase64String(Encrypted);
        }

        public static string Decrypt(string EncryptedText, string Key)
        {
            byte[] initVectorBytes = Encoding.ASCII.GetBytes(initVector);
            byte[] DeEncryptedText = Convert.FromBase64String(EncryptedText);
            PasswordDeriveBytes password = new PasswordDeriveBytes(Key, null);
            byte[] keyBytes = password.GetBytes(keysize / 8);
            RijndaelManaged symmetricKey = new RijndaelManaged();
            symmetricKey.Mode = CipherMode.CBC;
            ICryptoTransform decryptor = symmetricKey.CreateDecryptor(keyBytes, initVectorBytes);
            MemoryStream memoryStream = new MemoryStream(DeEncryptedText);
            CryptoStream cryptoStream = new CryptoStream(memoryStream, decryptor, CryptoStreamMode.Read);
            byte[] plainTextBytes = new byte[DeEncryptedText.Length];
            int decryptedByteCount = cryptoStream.Read(plainTextBytes, 0, plainTextBytes.Length);
            memoryStream.Close();
            cryptoStream.Close();
            return Encoding.UTF8.GetString(plainTextBytes, 0, decryptedByteCount);
        }

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I want to know my system information using C# 1. ProcessorId 2. Product 3. Manufacturer 4. Signature 5. Caption 6. PhysicalMedia(SerialNumber) 7. Version 8. OperatingSystem(SerialNumber) just call the method like this:

RunQuery("Processor", "ProcessorId");
RunQuery("BaseBoard", "Product");
RunQuery("BaseBoard", "Manufacturer");
RunQuery("DiskDrive", "Signature");
RunQuery("VideoController", "Caption");
RunQuery("PhysicalMedia", "SerialNumber");
RunQuery("BIOS", "Version");
RunQuery("OperatingSystem", "SerialNumber");

 private static string RunQuery(string TableName, string MethodName)
        {
            ManagementObjectSearcher MOS = new ManagementObjectSearcher("Select * from Win32_" + TableName);
            foreach (ManagementObject MO in MOS.Get())
            {
                try
                {
                    return MO[MethodName].ToString();
                }
                catch (Exception e)
                {
                    System.Windows.Forms.MessageBox.Show(e.Message);
                }
            }
            return "";
        }

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This code remove the special character from string value using c sharp. when i want to string value only the aliphatic and number. I trim the special character using the method.

private static string RemoveUseLess(string st)
        {
            char ch;
            for (int i = st.Length - 1; i >= 0; i--)
            {
                ch = char.ToUpper(st[i]);

                if ((ch < 'A' || ch > 'Z') &&
                    (ch < '0' || ch > '9'))
                {
                    st = st.Remove(i, 1);
                }
            }
            return st;
        }

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This is Encryption and Decryption algorithm. Its work good I used on this code working perfectly.

public static string Encrypt(string toEncrypt, bool useHashing)
{
    byte[] keyArray;
    byte[] toEncryptArray = UTF8Encoding.UTF8.GetBytes(toEncrypt);

    System.Configuration.AppSettingsReader settingsReader = 
                                        new AppSettingsReader();
    // Get the key from config file

    string key = (string)settingsReader.GetValue("SecurityKey", 
                                                     typeof(String));
    //System.Windows.Forms.MessageBox.Show(key);
    //If hashing use get hashcode regards to your key
    if (useHashing)
    {
        MD5CryptoServiceProvider hashmd5 = new MD5CryptoServiceProvider();
        keyArray = hashmd5.ComputeHash(UTF8Encoding.UTF8.GetBytes(key));
        //Always release the resources and flush data
        // of the Cryptographic service provide. Best Practice

        hashmd5.Clear();
    }
    else
        keyArray = UTF8Encoding.UTF8.GetBytes(key);

    TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider();
    //set the secret key for the tripleDES algorithm
    tdes.Key = keyArray;
    //mode of operation. there are other 4 modes.
    //We choose ECB(Electronic code Book)
    tdes.Mode = CipherMode.ECB;
    //padding mode(if any extra byte added)

    tdes.Padding = PaddingMode.PKCS7;

    ICryptoTransform cTransform = tdes.CreateEncryptor();
    //transform the specified region of bytes array to resultArray
    byte[] resultArray = 
      cTransform.TransformFinalBlock(toEncryptArray, 0, 
      toEncryptArray.Length);
    //Release resources held by TripleDes Encryptor
    tdes.Clear();
    //Return the encrypted data into unreadable string format
    return Convert.ToBase64String(resultArray, 0, resultArray.Length);
}





public static string Decrypt(string cipherString, bool useHashing)
{
    byte[] keyArray;
    //get the byte code of the string

    byte[] toEncryptArray = Convert.FromBase64String(cipherString);

    System.Configuration.AppSettingsReader settingsReader = 
                                        new AppSettingsReader();
    //Get your key from config file to open the lock!
    string key = (string)settingsReader.GetValue("SecurityKey", 
                                                 typeof(String));
            
    if (useHashing)
    {
        //if hashing was used get the hash code with regards to your key
        MD5CryptoServiceProvider hashmd5 = new MD5CryptoServiceProvider();
        keyArray = hashmd5.ComputeHash(UTF8Encoding.UTF8.GetBytes(key));
        //release any resource held by the MD5CryptoServiceProvider

        hashmd5.Clear();
    }
    else
    {
        //if hashing was not implemented get the byte code of the key
        keyArray = UTF8Encoding.UTF8.GetBytes(key);
    }

    TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider();
    //set the secret key for the tripleDES algorithm
    tdes.Key = keyArray;
    //mode of operation. there are other 4 modes. 
    //We choose ECB(Electronic code Book)

    tdes.Mode = CipherMode.ECB;
    //padding mode(if any extra byte added)
    tdes.Padding = PaddingMode.PKCS7;

    ICryptoTransform cTransform = tdes.CreateDecryptor();
    byte[] resultArray = cTransform.TransformFinalBlock(
                         toEncryptArray, 0, toEncryptArray.Length);
    //Release resources held by TripleDes Encryptor                
    tdes.Clear();
    //return the Clear decrypted TEXT
    return UTF8Encoding.UTF8.GetString(resultArray);
}



<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <appSettings>

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This is the print.config file

<PrintingConfiguration>
  <Printers>
    <Printer DisplayName="text1">senthil</Printer>
    <Printer DisplayName="text1">kumar</Printer>
  </Printers>
</PrintingConfiguration>

Step 1 : Create a click event and then load the xml file in XMLDocument object.
Step 2 : Select the corresponding node using "SelectSingleNode".
Step 3 : Next i will pass the delete node value "delectvalue" from the "MyDataGrid" grid view row DisplayName "Text1".
Step 4 : Delete the Selected node.

private void DeleteButton_Click(object sender, RoutedEventArgs e)
        {
            var doc = new XmlDocument();
            doc.Load(AppDomain.CurrentDomain.BaseDirectory + "..\\..\\Printing.config");           

            XmlNode root = doc.SelectSingleNode("//Printers");
            Author customerRow = MyDataGrid.SelectedItem as Author;

            string delectvalue = customerRow.DisplayName;

            string xpath = "//Printer[@DisplayName= \"" + delectvalue + "\"]";
            XmlNode currentNode = root.SelectSingleNode(xpath);
            
            if (currentNode != null)
            {
                // Delete the record.
                root.RemoveChild(currentNode);
            }
            // Save the changes. 
            doc.Save(printconfigFolder);

            LoadCustomers();
            MyDataGrid.Items.Refresh();
        }

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