将数据从一个类访问到另一个c#

public class SourceClass
{
    private string data;

    public string Data
    {
        get { return data; }
        set { data = value; }
    }
}

public class TargetClass
{
    public void AccessData()
    {
        SourceClass source = new SourceClass();
        source.Data = "Hello World";
        Console.WriteLine(source.Data);
    }
}

public class SourceClass
{
    private string data;

    public void SetData(string newData)
    {
        data = newData;
    }

    public string GetData()
    {
        return data;
    }
}

public class TargetClass
{
    public void AccessData()
    {
        SourceClass source = new SourceClass();
        source.SetData("Hello World");
        Console.WriteLine(source.GetData());
    }
}

public class SourceClass
{
    private string data;

    public SourceClass(string initData)
    {
        data = initData;
    }

    public string GetData()
    {
        return data;
    }
}

public class TargetClass
{
    private string data;

    public TargetClass(SourceClass source)
    {
        data = source.GetData();
    }

    public void AccessData()
    {
        Console.WriteLine(data);
    }
}

public class Program
{
    public static void Main(string[] args)
    {
        SourceClass source = new SourceClass("Hello World");
        TargetClass target = new TargetClass(source);
        target.AccessData();
    }
}