Converting bytes to GB in C#?

Question

I was refactoring some old code and came across the following line of code to convert bytes to GB.

decimal GB = KB / 1024 / 1024 / 1024;

Is

Answer 1

#region AutoFileSize
    public string AutoFileSize(long number)
    {
        double tmp = number;
        string suffix = " B ";
        if (tmp > 1024) { tmp = tmp / 1024; suffix = " KB"; }
        if (tmp > 1024) { tmp = tmp / 1024; suffix = " MB"; }
        if (tmp > 1024) { tmp = tmp / 1024; suffix = " GB"; }
        if (tmp > 1024) { tmp = tmp / 1024; suffix = " TB"; }
        return tmp.ToString("n") + suffix;
    }
    #endregion

long number = (long)fu.PostedFile.ContentLength;