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To convert a string to a byte array, you can use this method:

public static byte[] StringToByteArray(string s)
{
System.Text.ASCIIEncoding encoding = new System.Text.ASCIIEncoding();
return encoding.GetBytes(s);
}


To convert it back to a string:

public static string ByteArrayToString(byte[] b)
{
System.Text.ASCIIEncoding encode = new System.Text.ASCIIEncoding();
return encode.GetString(b);
}