i used the following code to concatenate two `byte[]` using override operator `+`.  

but there is an error i cannot understand.  

here is my method's header 

```
public static byte[] operator +(byte[] bytaArray1, byte[] bytaArray2){...}

```

Error text: 

> 
> One of the parameters of a binary operator must be the containing type
> 
> 
> 

how should i implement this?