How to use class from other files in C# with visual studio?

Question

I am a newbie of C# and MS visual studio, and I want to use the C# class which defined in another file, but can\'t get it work.

Here is the program.cs

Answer 1

namespace TestCSharp2
{
    **public** class Class2
    {
        int i;
        public void setValue(int i)
        {
            this.i = i;
        }
        public int getValue()
        {
        return this.i;
        }
    }
}

Add the 'Public' declaration before 'class Class2'.