Value of textBox of form1 have to appear in textBox of form2

Question

I need to show the value of textBox1 of Form1 (parent) in textBox2 of Form2 (child) after pressing an option in a menu (ie. to open the child form). Basically a parent-child communication problem. I've tried to modify this to do what I need but no luck, I get:

Used_values.h(30) : warning C4101: 'HERE' : unreferenced local variable
Used_values.h(560) : error C2065: 'HERE' : undeclared identifier

Here you can find the relevant parts of my code:

Form1 (parent):

#pragma once
#include "Used_values.h"

namespace Vp_vs_gasconcentration_WindowsForm {

    using namespace System;
    using namespace System::ComponentModel;
    using namespace System::Collections;
    using namespace System::Windows::Forms;
    using namespace System::Data;
    using namespace System::Drawing;

    public ref class Form1 : public System::Windows::Forms::Form
    {
    public:
        Form1(void)
        {
            InitializeComponent();
        }

    protected:
        ~Form1()
        {
            if (components)
            {
                delete components;
            }
        }
    private: System::Windows::Forms::MenuStrip^  menuStrip1_generalMenu;
    private: System::Windows::Forms::ToolStripMenuItem^  usedValues_ToolStripMenuItem;
    private: System::Windows::Forms::TextBox^  textBox1_waterDepth;
    //(more code...)

    private:
        System::ComponentModel::Container ^components;

#pragma region Windows Form Designer generated code
        void InitializeComponent(void)
        {
            //(more code...)
            this->textBox1_waterDepth = (gcnew System::Windows::Forms::TextBox());
            //(more code...)
            // 
            // textBox1_waterDepth
            // 
            this->textBox1_waterDepth->Font = (gcnew System::Drawing::Font(L"Segoe UI", 10));
            this->textBox1_waterDepth->Location = System::Drawing::Point(336, 185);
            this->textBox1_waterDepth->Name = L"textBox1_waterDepth";
            this->textBox1_waterDepth->Size = System::Drawing::Size(100, 25);
            this->textBox1_waterDepth->TabIndex = 1;
            this->textBox1_waterDepth->Text = L"2170";
            this->textBox1_waterDepth->TextAlign = System::Windows::Forms::HorizontalAlignment::Right;
            this->textBox1_waterDepth->TextChanged += gcnew System::EventHandler(this, &Form1::textBox1_waterDepth_TextChanged);
            //(more code...)
        }

#pragma endregion
    //(more code...)
    private: System::Void usedValues_ToolStripMenuItem_Click(System::Object^  sender, System::EventArgs^  e) {
                 Used_values^ used_values = gcnew Used_values();
                 used_values->StartPosition = FormStartPosition::CenterParent;
                 used_values->ShowDialog();
                 used_values->HERE = textBox1_waterDepth->Text;
             }
    //(more code...)
};
}

Used_values (child):

#pragma once

using namespace System;
using namespace System::ComponentModel;
using namespace System::Collections;
using namespace System::Windows::Forms;
using namespace System::Data;
using namespace System::Drawing;

namespace Vp_vs_gasconcentration_WindowsForm {

    public ref class Used_values : public System::Windows::Forms::Form
    {
    public:
        Used_values(void)
        {
            InitializeComponent();
            String ^HERE;
        }

    protected:
        ~Used_values()
        {
            if (components)
            {
                delete components;
            }
        }
    private: System::Windows::Forms::TextBox^  textBox1_waterDepthUsedValues;
    //(more code...)

    private:
        System::ComponentModel::Container ^components;

#pragma region Windows Form Designer generated code
        void InitializeComponent(void)
        {
            //(more code...)
            this->textBox1_waterDepthUsedValues = (gcnew System::Windows::Forms::TextBox());
(more code...)
            // 
            // textBox1_waterDepthUsedValues
            // 
            this->textBox1_waterDepthUsedValues->Location = System::Drawing::Point(435, 10);
            this->textBox1_waterDepthUsedValues->Name = L"textBox1_waterDepthUsedValues";
            this->textBox1_waterDepthUsedValues->Size = System::Drawing::Size(100, 25);
            this->textBox1_waterDepthUsedValues->TabIndex = 1;
            this->textBox1_waterDepthUsedValues->TextAlign = System::Windows::Forms::HorizontalAlignment::Right;
            this->textBox1_waterDepthUsedValues->TextChanged += gcnew System::EventHandler(this, &Used_values::textBox1_waterDepthUsedValues_TextChanged);
            //(more code...)
        }
#pragma endregion

private: System::Void textBox1_waterDepthUsedValues_TextChanged(System::Object^  sender, System::EventArgs^  e) {
             textBox1_waterDepthUsedValues->Text = HERE;
         }
};
}

So, what it should appear in textBox of Form2 (Used_values) is 2170 (default value of textBox in Form1).

Answer 1

Finally I found the solution! thanks to bash.d for all the support =)

1. change in the constructor of child form to receive a String parameter:

   public:
       Form2(String^ text)
       {
           InitializeComponent();
           this->textBox2->Text = text;
       }
   

2. show child form when a button is clicked in parent form:

   private: System::Void button1_Click(System::Object^  sender, System::EventArgs^  e) {
        Form2^ form = gcnew Form2(this->textBox1->Text);
        form->Show();
    }