Visual C++ .NET/GUI Form/ComboBox

Sync ComboBox

<source lang="csharp">

 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();
           PopulateLists();
   }
       System::Windows::Forms::ComboBox^  ddlist;
       System::Windows::Forms::ComboBox^  simple;
       System::Windows::Forms::ComboBox^  ddown;
   void InitializeComponent(void)
   {
           this->ddlist = (gcnew System::Windows::Forms::ComboBox());
           this->simple = (gcnew System::Windows::Forms::ComboBox());
           this->ddown = (gcnew System::Windows::Forms::ComboBox());
           this->SuspendLayout();
           // 
           // ddlist
           // 
           this->ddlist->DropDownStyle = 
               System::Windows::Forms::ComboBoxStyle::DropDownList;
           this->ddlist->FormattingEnabled = true;
           this->ddlist->Location = System::Drawing::Point(300, 14);
           this->ddlist->Name = L"ddlist";
           this->ddlist->Size = System::Drawing::Size(121, 21);
           this->ddlist->TabIndex = 5;
           this->ddlist->SelectedIndexChanged += 
               gcnew System::EventHandler(this, &Form1::ddlist_Change);
           // 
           // simple
           // 
           this->simple->DropDownStyle = 
               System::Windows::Forms::ComboBoxStyle::Simple;
           this->simple->FormattingEnabled = true;
           this->simple->Location = System::Drawing::Point(154, 11);
           this->simple->Name = L"simple";
           this->simple->Size = System::Drawing::Size(122, 117);
           this->simple->TabIndex = 4;
           this->simple->SelectedIndexChanged += 
               gcnew System::EventHandler(this, &Form1::simple_Change);
           this->simple->TextChanged += 
               gcnew System::EventHandler(this, &Form1::simple_Change);
           // 
           // ddown
           // 
           this->ddown->FormattingEnabled = true;
           this->ddown->Location = System::Drawing::Point(12, 14);
           this->ddown->MaxDropDownItems = 3;
           this->ddown->MaxLength = 10;
           this->ddown->Name = L"ddown";
           this->ddown->Size = System::Drawing::Size(121, 21);
           this->ddown->TabIndex = 3;
           this->ddown->SelectedIndexChanged += 
               gcnew System::EventHandler(this, &Form1::ddown_Change);
           this->ddown->TextChanged += 
               gcnew System::EventHandler(this, &Form1::ddown_Change);
           // 
           // Form1
           // 
           this->AutoScaleDimensions = System::Drawing::SizeF(6, 13);
           this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
           this->ClientSize = System::Drawing::Size(433, 138);
           this->Controls->Add(this->ddlist);
           this->Controls->Add(this->simple);
           this->Controls->Add(this->ddown);
           this->Name = L"Form1";
           this->Text = L"Synchronized Combo boxing";
           this->ResumeLayout(false);
   }
       void PopulateLists()
       {
           // Item to be placed in all ComboBoxes
           array<Object^>^ ddItems = gcnew array<Object^> { 
               L"oranges", L"cherries", L"apples",
               L"lemons",  L"bananas",  L"grapes" 
           };
           ddown->Items->AddRange(ddItems);        
           simple->Items->AddRange(ddItems);        
           ddlist->Items->AddRange(ddItems);
       }
       System::Void ddown_Change(System::Object^ sender, System::EventArgs^ e)
       {
           // Update simple and dropdownlist with dropdown text
           simple->Text = ddown->Text; 
           ddlist->SelectedItem = ddown->Text; 
       }
       System::Void simple_Change(System::Object^ sender,System::EventArgs^ e)
       {
           // Update dropdown and dropdownlist with simple text
           ddown->Text = simple->Text; 
           ddlist->SelectedItem = simple->Text; 
       }
       System::Void ddlist_Change(System::Object^ sender,System::EventArgs^ e)
       {
           // Update simple and dropdown with dropdownlist SelectedText
           ddown->SelectedItem = ddlist->SelectedItem; 
           simple->SelectedItem = ddlist->SelectedItem; 
       }
 };

[STAThreadAttribute] int main(array<System::String ^> ^args) {

 Application::Run(gcnew Form1());
 return 0;

}

 </source>