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ListControl::SelectedValueChanged Event

Occurs when the SelectedValue property changes.

Namespace:  System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)

 event EventHandler^ SelectedValueChanged {
	void add (EventHandler^ value);
	void remove (EventHandler^ value);

For more information about handling events, see Consuming Events.

The following code example is a complete application that shows how you can use DataSource, DisplayMember, ValueMember, and SelectedValue members of the ListControl class as implemented by the ListBox class. The example loads an ArrayList and the list box. The example also uses the SelectedValueChanged event to fill in a text box when the user selects an item in the list box. The text box is filled with the data associated with the selected item.

#using <System.dll>
#using <System.Drawing.dll>
#using <System.Windows.Forms.dll>

using namespace System;
using namespace System::Windows::Forms;
using namespace System::Drawing;
using namespace System::Collections;
public ref class USState
   String^ myShortName;
   String^ myLongName;

   USState( String^ strLongName, String^ strShortName )
      this->myShortName = strShortName;
      this->myLongName = strLongName;

   property String^ ShortName 
      String^ get()
         return myShortName;

   property String^ LongName 
      String^ get()
         return myLongName;


public ref class ListBoxSample3: public Form
   ListBox^ ListBox1;
   Label^ label1;
   TextBox^ textBox1;

      ListBox1 = gcnew ListBox;
      label1 = gcnew Label;
      textBox1 = gcnew TextBox;
      this->ClientSize = System::Drawing::Size(307, 206 );
      this->Text = "ListBox Sample3";
      ListBox1->Location = Point(54,16);
      ListBox1->Name = "ListBox1";
      ListBox1->Size = System::Drawing::Size( 240, 130 );
      label1->Location = Point(14,150);
      label1->Name = "label1";
      label1->Size = System::Drawing::Size(40, 24);
      label1->Text = "Value";
      textBox1->Location = Point(54,150);
      textBox1->Name = "textBox1";
      textBox1->Size = System::Drawing::Size( 240, 24 );
      array<Control^>^temp2 = {ListBox1,label1, textBox1};
      this->Controls->AddRange( temp2 );

      // Populate the list box using an array as DataSource.  
      // DisplayMember is used to display just the long name of each state.
      ArrayList^ USStates = gcnew ArrayList;
      USStates->Add( gcnew USState( "Alabama","AL" ) );
      USStates->Add( gcnew USState( "Washington","WA" ) );
      USStates->Add( gcnew USState( "West Virginia","WV" ) );
      USStates->Add( gcnew USState( "Wisconsin","WI" ) );
      USStates->Add( gcnew USState( "Wyoming","WY" ) );
      ListBox1->DataSource = USStates;
      ListBox1->DisplayMember = "LongName";
      ListBox1->ValueMember = "ShortName";
      ListBox1->SelectedValueChanged += gcnew EventHandler( this, &ListBoxSample3::ListBox1_SelectedValueChanged );
      ListBox1->SetSelected(0, false);

   void InitializeComponent(){}

   void ListBox1_SelectedValueChanged( Object^ /*sender*/, EventArgs^ /*e*/ )
      if ( ListBox1->SelectedIndex != -1 )
            textBox1->Text = ListBox1->SelectedValue->ToString();

int main()
   Application::Run( gcnew ListBoxSample3 );

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0