Given two files:

File1 

> 
> a a a  
> 
>  b b b  
> 
>  c c c
> 
> 
> 

File2 

> 
> d d  
> 
>  e e
> 
> 
> 

Bash has a command that will horizontally concatenate these files:

```
paste File1 File2

```

> 
> a a a d d  
> 
>  b b b e e  
> 
>  c c c
> 
> 
> 

Does C# have a built-in function that behaves like this?