This documentation is archived and is not being maintained.

ControlCollection.SyncRoot Property

Gets an object that can be used to synchronize access to the collection of controls.

[Visual Basic]
Public Overridable ReadOnly Property SyncRoot As Object  Implements _
public virtual object SyncRoot {get;}
public: __property virtual Object* get_SyncRoot();
public function get SyncRoot() : Object;

Property Value

The Object used to synchronize the collection.




[Visual Basic] The following example creates a method that enumerates through the ControlCollection of a Button control, myButton. Once the enumerator is created, the IsSynchronized property is checked to see if the operation is thread-safe, and if it is not, the SyncRoot property is used to obtain an object to make the operation thread-safe. Once the enumeration is complete, the value of the IsReadOnly property is written as the Text property of a Label control on the containing page.

[Visual Basic] 
' Create a method that enuberates through a 
' button's ControlCollection in a thread-safe manner.  
Public Sub ListControlCollection(sender As Object, e As EventArgs)
   Dim myEnumerator As IEnumerator = myButton.Controls.GetEnumerator()

   ' Check the IsSynchronized property. If False,
   ' use the SyncRoot method to get an object that 
   ' allows the enumeration of all controls to be 
   ' thread safe.
   If myButton.Controls.IsSynchronized = False Then
     SyncLock myButton.Controls.SyncRoot
       While (myEnumerator.MoveNext())

       Dim myObject As Object  = myEnumerator.Current
         Dim childControl As LiteralControl = CType(myEnumerator.Current, LiteralControl)
         Response.Write("<b><br> This is the  text of the child Control  </b>: " & _
       End While
      msgReadOnly.Text = myButton.Controls.IsReadOnly.ToString()
      End SyncLock
   End If       
 End Sub

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


Platforms: Windows 2000, Windows XP Professional, Windows Server 2003 family

See Also

ControlCollection Class | ControlCollection Members | System.Web.UI Namespace | Controls