How to get type length of bytes ?

I write the code to iterate the class properties.

static class PacketCoder
{
    public static byte[] PacketToData<T>(AppSignal signal, T packet)
    {
        byte[] dataBuf = new byte[1000];
        byte[] dataTemp = BitConverter.GetBytes((short)signal);
        Array.Copy(dataTemp, dataBuf, dataTemp.Length);
        int dataIndex = dataTemp.Length;

        Type t = packet.GetType();
        var props = t.GetProperties();
        foreach (var prop in props)
        {
            string name = prop.Name;
            object value = prop.GetValue(packet);

            if (value.GetType() == typeof(bool))
            {
                dataTemp = BitConverter.GetBytes((bool)value);
            }
            else if (value.GetType() == typeof(short))
            {
                dataTemp = BitConverter.GetBytes((short)value);
            }
            else if (value.GetType() == typeof(int))
            {
                dataTemp = BitConverter.GetBytes((int)value);
            }

            Array.Copy(dataTemp, 0, dataBuf, dataIndex, dataTemp.Length);
            dataIndex += dataTemp.Length;

            Console.WriteLine("Name:   {0}", name);
            Console.WriteLine("Length: {0}", dataTemp.Length);
            Console.WriteLine("Value:  {0}", value);
            Console.WriteLine("");
        }

        byte[] dataFinal = new byte[dataIndex];
        Array.Copy(dataBuf, dataFinal, dataIndex);
        return dataFinal;
    }
}

I want to make the three if to one:

                    if (value.GetType() == typeof(bool))
                    {
                        dataTemp = BitConverter.GetBytes((bool)value);
                    }
                    else if (value.GetType() == typeof(short))
                    {
                        dataTemp = BitConverter.GetBytes((short)value);
                    }
                    else if (value.GetType() == typeof(int))
                    {
                        dataTemp = BitConverter.GetBytes((int)value);
                    }

Some one can you tell me how to do this?