C#

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MyPluginDllClass
{
  //Fields
 
  //Properties
 
  MyClass _myClass {get; set} = new(this);  //this does not work !!!
 
  //Ctor
  public MyPluginDllClass
  {
	//do sth
  }
  
  //Member Functions
  public void Test1()
  {
		//do sth
  }
  
}


public MyClass
{

    MyPluginDllClass _instanceMyPluginDllClass;

    public MyClass(MyPluginDllClass param)
    {

		_instanceMyPluginDllClass = param;

    }
	
	
	//Member Functions
	public void Test2()
	{
	    _instanceMyPluginDllClass.Test1();
	}

}

MyClass _myClass {get; set} = new(this); 

// Recursive method for listing the email addresses of email-enabled public folders
static void ListPublicFolders(Outlook.Folder? folder, string indent)
{
    if (folder != null)
    {
        foreach (object obj in folder.Folders)
        {
            if (obj is Outlook.Folder)
            {
                Outlook.Folder? subFolder = obj as Outlook.Folder;

                if (subFolder != null && subFolder.DefaultItemType == Outlook.OlItemType.olMailItem)
                {
                    Outlook.MAPIFolder? parentFolder = subFolder.Parent as Outlook.MAPIFolder;
                    string              parentName   = parentFolder != null ? parentFolder.Name : "Parent folder not found";

                    Console.WriteLine($"{indent}- {subFolder.Name}: {parentName}");

                    if (parentFolder != null)
                    {
                        Marshal.ReleaseComObject(parentFolder);
                    }
                }

                ListPublicFolders(subFolder, indent + "  ");

                if (subFolder != null)
                {
                    Marshal.ReleaseComObject(subFolder);
                }
            }
        }
    }
}

if (subFolder != null && subFolder.DefaultItemType == Outlook.OlItemType.olMailItem)

 int Value = 0;
Value = Convert.ToInt16(textBox1.Text)

if(Value > 1000) 
{
 MessageBox.Show("Here!");
}