Contains Method

Control.ControlCollection.Contains Method

Determines whether the specified control is a member of the collection.

[Visual Basic]
Public Function Contains( _
   ByVal control As Control _
) As Boolean
public bool Contains(
 Control control
public: bool Contains(
 Control* control
public function Contains(
   control : Control
) : Boolean;


The Control to locate in the collection.

Return Value

true if the Control is a member of the collection; otherwise, false.


This method enables you to determine whether a Control is a member of the collection before attempting to perform operations on the Control. You can use this method to confirm that a Control has been added to or is still a member of the collection.


[Visual Basic, C#, C++] The following example removes a Control from the Control.ControlCollection of the derived class Panel if it is a member of the collection. The example assumes you have created a Panel, a Button, and at least one RadioButton control on a Form. The RadioButton control(s) are added to the Panel control, and the Panel control added to the Form. When the button is clicked, the radio button named radioButton2 is removed from the Control.ControlCollection.

[Visual Basic] 
' Remove the RadioButton control if it exists.
Private Sub RemoveButton_Click(ByVal sender As System.Object, _
    ByVal e As System.EventArgs) Handles RemoveButton.Click
    If Panel1.Controls.Contains(RadioAddRangeButton) Then
    End If
End Sub

// Remove the RadioButton control if it exists.
private void removeButton_Click(object sender, System.EventArgs e)

// Remove the RadioButton control if it exists.
void removeButton_Click(Object* /*sender*/, System::EventArgs* /*e*/) {
    if (panel1->Controls->Contains(removeButton)) {

[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.


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

See Also

Control.ControlCollection Class | Control.ControlCollection Members | System.Windows.Forms Namespace | Control

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