having trouble with global variable

Question

I looked all over the internet for solutions to this but none of them work:

public static void Main (string[] args)
{
    Console.Write ("What is your name: ");
    string input = Console.ReadLine ();

    sayHi ();
}

public static string sayHi() {
    Console.WriteLine ("Hello {0}!", input);
}

I don't need an answer that will help me do this without a global variable, that's not what I'm looking for

When I execute this I get this error:

The name 'input' does not exist in the current context

I tried making one of the lines

public string input = Console.ReadLine ();

but I get

Unexpected symbol 'public'

I tried

static string input = Console.ReadLine ();

But I get

Unexpected symbol 'static'

This

public static string input = Console.ReadLine ();

gives me

Unexpected symbol 'public'

I don't want a solution that doesn't use global variables

Answer 1

You should declare the variable outside of the Main method in the class containing both functions:

private static string input;

public static void Main (string[] args)
{
    Console.Write ("What is your name: ");
    input = Console.ReadLine ();

    sayHi ();
}

public static string sayHi() {
    Console.WriteLine ("Hello {0}!", input);
}

In this case the scope of the input variable will be the containing class and you can access it from all methods within this class.

Answer 2

There is no such thing as global variables in C#. This will do the trick for you. You could also try the static class with static members solution to simulate something like global variables, but that still won't be a global variable.

Try this (you're using an attribute in the class in this solution, it will be "global" inside this class)

public class YourClass{

    private static string _input;

    public static void Main (string[] args)
    {
        Console.Write ("What is your name: ");
        _input = Console.ReadLine ();

        sayHi ();
    }

    public static string sayHi() {
        Console.WriteLine ("Hello {0}!", _input);
    }
}

Answer 3

You can use Static class

static class Global
{
   private static string _gVariable1 = "";

   public static string Variable1
   {
      get { return _gVariable1 ; }
      set { _gVariable1 = value; }
   }
}

And you can use it like

Global.Variable1 = "any string value"