Control.CreateChildControls Method (System.Web.UI)

CreateChildControls Method

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This page is specific to

Microsoft Visual Studio 2008/.NET Framework 3.5

Other versions are also available for the following:

.NET Framework Class Library

Control..::.CreateChildControls Method

Updated: November 2007

Called by the ASP.NET page framework to notify server controls that use composition-based implementation to create any child controls they contain in preparation for posting back or rendering.

Namespace: System.Web.UI
Assembly: System.Web (in System.Web.dll)

Syntax

Visual Basic (Declaration)

Protected Friend Overridable Sub CreateChildControls

Visual Basic (Usage)

Me.CreateChildControls()

protected internal virtual void CreateChildControls()

Visual C++

protected public:
virtual void CreateChildControls()

protected void CreateChildControls()

JScript

protected internal function CreateChildControls()

Remarks

When you develop a composite or templated server control, you must override this method. Controls that override the CreateChildControls method should implement the INamingContainer interface to avoid naming conflicts.

For more information, see ASP.NET Web Server Controls Templates and Developing Custom ASP.NET Server Controls.

Examples

The following example demonstrates an overridden version of the CreateChildControls method. In this implementation, the composite control displays a TextBox control enclosed in two literal controls that render HTML.

Security Note:
This example has a text box that accepts user input, which is a potential security threat. By default, ASP.NET Web pages validate that user input does not include script or HTML elements. For more information, see Script Exploits Overview.

Visual Basic

' Override CreateChildControls to create the control tree.
<System.Security.Permissions.PermissionSetAttribute(System.Security.Permissions.SecurityAction.Demand, Name:="Execution")> _
Protected Overrides Sub CreateChildControls()

   ' Add a LiteralControl to the current ControlCollection.
   Me.Controls.Add(New LiteralControl("<h3>Value: "))


   ' Create a text box control, set the default Text property, 
   ' and add it to the ControlCollection.
   Dim box As New TextBox()
   box.Text = "0"
   Me.Controls.Add(box)

   Me.Controls.Add(New LiteralControl("</h3>"))
End Sub 'CreateChildControls

// Override CreateChildControls to create the control tree.
 [System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name="Execution")]
 protected override void CreateChildControls() {

     // Add a LiteralControl to the current ControlCollection.
     this.Controls.Add(new LiteralControl("<h3>Value: "));


     // Create a text box control, set the default Text property, 
     // and add it to the ControlCollection.
     TextBox box = new TextBox();
     box.Text = "0";
     this.Controls.Add(box);

     this.Controls.Add(new LiteralControl("</h3>"));
 }

// Override CreateChildControls to create the control tree.
/** @attribute System.Security.Permissions.PermissionSet(
    System.Security.Permissions.SecurityAction.Demand, Name = "Execution")
 */
protected void CreateChildControls()
{
    // Add a LiteralControl to the current ControlCollection.
    this.get_Controls().Add(new LiteralControl("<h3>Value: "));
    // Create a text box control, set the default Text property, 
    // and add it to the ControlCollection.
    TextBox box = new TextBox();
    box.set_Text("0");
    this.get_Controls().Add(box);

    this.get_Controls().Add(new LiteralControl("</h3>"));
} //CreateChildControls

JScript

// Override CreateChildControls to create the control tree.
 protected override function CreateChildControls() 
 {

     // Add a LiteralControl to the current ControlCollection.
     this.Controls.Add(new LiteralControl("<h3>Value: "));

     // Create a text box control, set the default Text property, 
     // and add it to the ControlCollection.
     var box : TextBox = new TextBox();
     box.Text = "0";
     this.Controls.Add(box);

     this.Controls.Add(new LiteralControl("</h3>"));
 }

Platforms

Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

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.

Version Information