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SystemInformation.MonitorCount Property

Gets the number of display monitors on the desktop.

[Visual Basic]
Public Shared ReadOnly Property MonitorCount As Integer
[C#]
public static int MonitorCount {get;}
[C++]
public: __property static int get_MonitorCount();
[JScript]
public static function get MonitorCount() : int;

Property Value

The number of monitors that make up the desktop.

Remarks

This property returns a value greater than one only if multiple monitors are currently connected to the operating system.

Example

[Visual Basic, C#, C++] The following example demonstrates reading system information via the SystemInformation class and adds the information to a ListBox on the form.

[Visual Basic] 
Imports System
Imports System.Drawing
Imports System.Windows.Forms

Public NotInheritable Class Form1
    Inherits System.Windows.Forms.Form

    Friend WithEvents BtnGetScreenInfo As System.Windows.Forms.Button
    Friend WithEvents ListBox1 As System.Windows.Forms.ListBox

    <System.STAThread()> _
    Public Shared Sub Main()
        System.Windows.Forms.Application.Run(New Form1())
    End Sub 'Main

    Public Sub New()
        MyBase.New()

        Me.BtnGetScreenInfo = New System.Windows.Forms.Button
        Me.ListBox1 = New System.Windows.Forms.ListBox

        ' Get System Information Button
        Me.BtnGetScreenInfo.Location = New System.Drawing.Point(16, 16)
        Me.BtnGetScreenInfo.Size = New System.Drawing.Size(256, 48)
        Me.BtnGetScreenInfo.TabIndex = 0
        Me.BtnGetScreenInfo.Text = "Get System Information"

        ' System Information ListBox
        Me.ListBox1.Location = New System.Drawing.Point(16, 72)
        Me.ListBox1.Size = New System.Drawing.Size(256, 186)
        Me.ListBox1.TabIndex = 1

        ' Form1
        Me.ClientSize = New System.Drawing.Size(292, 317)
        Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.ListBox1, Me.BtnGetScreenInfo})
        Me.Text = "System Information Example"

    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnGetScreenInfo.Click
        ' Get System Information for the current machine.
        ListBox1.Items.Add("ComputerName : " + SystemInformation.ComputerName)
        ListBox1.Items.Add("Network  : " + SystemInformation.Network.ToString())
        ListBox1.Items.Add("UserDomainName  : " + SystemInformation.UserDomainName)
        ListBox1.Items.Add("UserName   : " + SystemInformation.UserName)
        ListBox1.Items.Add("BootMode : " + SystemInformation.BootMode.ToString())
        ListBox1.Items.Add("MenuFont : " + SystemInformation.MenuFont.ToString())
        ListBox1.Items.Add("MonitorCount : " + SystemInformation.MonitorCount.ToString())
        ListBox1.Items.Add("MonitorsSameDisplayFormat : " + SystemInformation.MonitorsSameDisplayFormat.ToString())
        ListBox1.Items.Add("ArrangeDirection: " + SystemInformation.ArrangeDirection.ToString())
        ListBox1.Items.Add("MousePresent : " + SystemInformation.MousePresent.ToString())
        ListBox1.Items.Add("MouseButtonsSwapped    : " + SystemInformation.MouseButtonsSwapped.ToString())
        ListBox1.Items.Add("UserInteractive    : " + SystemInformation.UserInteractive.ToString())
        ListBox1.Items.Add("VirtualScreen: " + SystemInformation.VirtualScreen.ToString())
    End Sub
End Class

[C#] 
using System;
using System.Drawing;
using System.Windows.Forms;

namespace Screen_Example_cs
{
    public class Form1 : System.Windows.Forms.Form
    {
        private System.Windows.Forms.Button button1;
        private System.Windows.Forms.ListBox listBox1;

        [STAThread]
        static void Main() 
        {
            Application.Run(new Form1());
        }

        public Form1()
        {
            this.button1 = new System.Windows.Forms.Button();
            this.listBox1 = new System.Windows.Forms.ListBox();

            // Get System Information Button
            this.button1.Location = new System.Drawing.Point(56, 16);
            this.button1.Size = new System.Drawing.Size(168, 23);
            this.button1.TabIndex = 0;
            this.button1.Text = "Get System Information";
            this.button1.Click += new System.EventHandler(this.button1_Click);

            // System Information ListBox
            this.listBox1.Location = new System.Drawing.Point(8, 48);
            this.listBox1.Size = new System.Drawing.Size(280, 186);
            this.listBox1.TabIndex = 1;

            // Form1
            this.ClientSize = new System.Drawing.Size(292, 273);
            this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                        this.listBox1, this.button1});
            this.Text = "System Information Example";
        }
        private void button1_Click(object sender, System.EventArgs e)
        {
            // Get system information for the current machine.
            listBox1.Items.Add("ComputerName : " + SystemInformation.ComputerName );
            listBox1.Items.Add("Network  : " + SystemInformation.Network  );
            listBox1.Items.Add("UserDomainName  : " + SystemInformation.UserDomainName  );            
            listBox1.Items.Add("UserName   : " + SystemInformation.UserName   );        
            listBox1.Items.Add("BootMode : " + SystemInformation.BootMode );
            listBox1.Items.Add("MenuFont : " + SystemInformation.MenuFont );
            listBox1.Items.Add("MonitorCount : " + SystemInformation.MonitorCount );
            listBox1.Items.Add("MonitorsSameDisplayFormat : " + SystemInformation.MonitorsSameDisplayFormat.ToString() );
            listBox1.Items.Add("ArrangeDirection: " + SystemInformation.ArrangeDirection);
            listBox1.Items.Add("MousePresent : " + SystemInformation.MousePresent );
            listBox1.Items.Add("MouseButtonsSwapped    : " + SystemInformation.MouseButtonsSwapped    );    
            listBox1.Items.Add("UserInteractive    : " + SystemInformation.UserInteractive    );
            listBox1.Items.Add("VirtualScreen: " + SystemInformation.VirtualScreen ); 
        }
    }
}

[C++] 
#using <mscorlib.dll>
#using <System.dll>
#using <System.Windows.Forms.dll>
#using <System.Drawing.dll>

using namespace System;
using namespace System::Drawing;
using namespace System::Windows::Forms;

namespace Screen_Example_cs {
public __gc class Form1 : public System::Windows::Forms::Form {
private:
   System::Windows::Forms::Button*  button1;
   System::Windows::Forms::ListBox*  listBox1;
public:
   Form1() {
      this->button1 = new System::Windows::Forms::Button();
      this->listBox1 = new System::Windows::Forms::ListBox();

      // Get System Information Button
      this->button1->Location =  System::Drawing::Point(56, 16);
      this->button1->Size =  System::Drawing::Size(168, 23);
      this->button1->TabIndex = 0;
      this->button1->Text = S"Get System Information";
      this->button1->Click += new System::EventHandler(this, &Form1::button1_Click);

      // System Information ListBox
      this->listBox1->Location =  System::Drawing::Point(8, 48);
      this->listBox1->Size =  System::Drawing::Size(280, 186);
      this->listBox1->TabIndex = 1;

      // Form1
      this->ClientSize =  System::Drawing::Size(292, 273);

      System::Windows::Forms::Control* temp0 [] = {this->listBox1, this->button1};

      this->Controls->AddRange(temp0);
      this->Text = S"System Information Example";
   }
private:
   void button1_Click(Object* /*sender*/, System::EventArgs* /*e*/) {
      // Get system information for the current machine.
      listBox1->Items->Add(String::Format(S"ComputerName : {0}", SystemInformation::ComputerName));
      listBox1->Items->Add(String::Format(S"Network  : {0}", __box(SystemInformation::Network)));
      listBox1->Items->Add(String::Format(S"UserDomainName  : {0}", SystemInformation::UserDomainName));
      listBox1->Items->Add(String::Format(S"UserName   : {0}", SystemInformation::UserName));
      listBox1->Items->Add(String::Format(S"BootMode : {0}", __box(SystemInformation::BootMode)));
      listBox1->Items->Add(String::Format(S"MenuFont : {0}", SystemInformation::MenuFont));
      listBox1->Items->Add(String::Format(S"MonitorCount : {0}", __box(SystemInformation::MonitorCount)));
      listBox1->Items->Add(String::Format(S"MonitorsSameDisplayFormat : {0}", __box(SystemInformation::MonitorsSameDisplayFormat)));
      listBox1->Items->Add(String::Format(S"ArrangeDirection: {0}", __box(SystemInformation::ArrangeDirection)));
      listBox1->Items->Add(String::Format(S"MousePresent : {0}", __box(SystemInformation::MousePresent)));
      listBox1->Items->Add(String::Format(S"MouseButtonsSwapped    : {0}", __box(SystemInformation::MouseButtonsSwapped)));
      listBox1->Items->Add(String::Format(S"UserInteractive    : {0}", __box(SystemInformation::UserInteractive)));
      listBox1->Items->Add(String::Format(S"VirtualScreen: {0}", __box(SystemInformation::VirtualScreen)));
   }
};
}

[STAThread]
int main() {
   Application::Run(new Screen_Example_cs::Form1());
}

[JScript] No example is available for JScript. To view a Visual Basic, C#, or C++ example, click the Language Filter button Language Filter in the upper-left corner of the page.

Requirements

Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family

See Also

SystemInformation Class | SystemInformation Members | System.Windows.Forms Namespace | SystemInformation | MonitorsSameDisplayFormat

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