Form to form communication - send and receive data.

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C#3.5

form

I have two form, form one called IDE and form two called CodeEditor.
This is my code in the constructor :

private CodeEditor FCodeEditor;
public IDE()
        {
InitializeComponent();
FCodeEditor = new CodeEditor(this);
}

//this is method to get string from form CodeEditor

string ILPcodes;
        public string ILPCodes(string codes)
        {
            ILPcodes = codes;
            return ILPcodes;
        }

//then i try to call method signalActiveTheLexer from form code editor to return the string to ILPcodes variable.

public void lex()
{
            FCodeEditor.signalActiveTheLexer();

            //Lexing
            adaptiveILPLexer(ILPcodes);
}

This is constructor for form CodeEditor :

private IDE SendToIDE;
        public CodeEditor(IDE MainForm)
        {
            SendToIDE = MainForm;
        }

//this is the method that i wish can return the code from codeeditor control
public void signalActiveTheLexer()
        {
            SendToIDE.ILPCodes(CodeEditorControl.Text);
        }

the problem i always get null result? why? i change codeeditorcontrol with textbox1.text the result still null. if i using this trick from form to class for interaction the result always success, but form to form i get problem

What I have tried:

i was read this article but i cant see how to solve my problem..
tried to learn about delegate, constructor, properties..

Passing Data Between Forms[^]