How to make global variables?

Question

In Windows application development using C# .NET, how do you make a global variable or global instance of a class, which can then be directly used by all other windows forms, e.g. form1, form2, etc.

Answer 1

You can create a static class and define a static variable inside it.

All the classes in your project can refer to it using MyGlobalVariables.GlobalVariable

public static class MyGlobalVariables
{
   public static int GlobalVariable;
}

Answer 2

Create a public static class which holds the global variables

eg.

public static class GlobalValues
{
      public static int UserId{get;set;}
}

Read more about C# Global Variable

Also I guess you should read about Classes and Structs

Answer 3

Make it as a static variable and static class, e.g.

private static string foo = "this is static";

public static class Bar {}

Answer 4

Create singleton class so that instace can be created once and used across application

public class Global 
{
    private static readonly Global instance = new Global();
    public static Global Instance
    {
        get
        {
            return instance;
        }
    }

    Global()
    {
    }
    public string myproperty
    {
        get;set;
    }
    }

Usage: Global.Instance.myproperty