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Form::TopLevel Property

Gets or sets a value indicating whether to display the form as a top-level window.

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

[BrowsableAttribute(false)]
public:
property bool TopLevel {
	bool get ();
	void set (bool value);
}

Property Value

Type: System::Boolean
true to display the form as a top-level window; otherwise, false. The default is true.

ExceptionCondition
Exception

A Multiple-document interface (MDI) parent form must be a top-level window.

A top-level form is a window that has no parent form, or whose parent form is the desktop window. Top-level windows are typically used as the main form in an application.

The following code example use the Modal property to determine if a form is displayed as a modal form. If it is not the FormBorderStyle and TopLevel properties are changed to make the form non-top-level form with a tool window border.

private:
   void ShowMyNonModalForm()
   {
      Form^ myForm = gcnew Form;
      myForm->Text = "My Form";
      myForm->SetBounds( 10, 10, 200, 200 );
      myForm->Show();

      // Determine if the form is modal. 
      if ( myForm->Modal == false )
      {
         // Change borderstyle and make it not a top level window.
         myForm->FormBorderStyle = ::FormBorderStyle::FixedToolWindow;
         myForm->TopLevel = false;
      }
   }

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1
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