I'm trying to convert celsius to fahrenheit with C# ASP.net web forms in visual studio 2010.

I'm using a function to perform the conversion, including this code line:

`return (celsius * (9 / 5)) + 32;`

It doesn't calculate right! If I put in celsius = 16, I'm getting 48. 

I've tried doing the same in PHP, - I'm getting 60, which is what I'm suppose to get.

Any idea what could be wrong here?