About little endian and big endian when socket programing

Socket-packet-little-endian-and-big-endian.cs

private List<byte> bnetData = new List<byte>();
private BnetHelper bnetHelper = BnetHelper.getInstance();
public byte bnetCommand;
public int serverToken = 0;
public int clientToken = 0;

public BnetProtocol()
{

}

public void setBnetByte(byte[] byteData)
{
    foreach (byte data in byteData)
    {
        bnetData.Add(data);
    }
}

public void setBnetByte(UInt32 intData, bool isVariable = false)
{
    byte[] bData = BitConverter.GetBytes(intData);
    // In transport, you have to use the big endian.
    if (BitConverter.IsLittleEndian)
        Array.Reverse(bData);
    foreach (byte data in bData)
    {
        bnetData.Add(data);
    }
}

public void setBnetByte(String strData, bool isVariable = false)
{
    String hexData = bnetHelper.Acsii2Hex(strData);
    if (isVariable)
    {
        byte[] bData = bnetHelper.Hex2Byte(hexData);
        this.setBnetByte(bData);
    }
    else {
        UInt32 intData = UInt32.Parse(hexData, System.Globalization.NumberStyles.AllowHexSpecifier);
        this.setBnetByte(intData, isVariable);
    }
}

BnetHelper class는 무엇인가요?