Control.Render Method (System.Web.UI)

Render Method

.NET Framework Class Library

Control..::.Render Method

Sends server control content to a provided HtmlTextWriter object, which writes the content to be rendered on the client.

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

Syntax

Visual Basic (Declaration)

Protected Friend Overridable Sub Render ( _
    writer As HtmlTextWriter _
)

Visual Basic (Usage)

Dim writer As HtmlTextWriter

Me.Render(writer)

protected internal virtual void Render(
    HtmlTextWriter writer
)

Visual C++

protected public:
virtual void Render(
    HtmlTextWriter^ writer
)

JScript

protected internal function Render(
    writer : HtmlTextWriter
)

Parameters

writer: Type: System.Web.UI..::.HtmlTextWriter
The HtmlTextWriter object that receives the server control content.

Remarks

When developing custom server controls, you can override this method to generate content for an ASP.NET page.

Examples

The following code example demonstrates overriding the Render method. The HasControls method is used to determine whether the server control has any child controls stored in its ControlCollection object, which is accessible through the Control..::.Controls property. If HasControls returns true and the first server control in the collection is literal text, then the literal text is appended to an HTML string.

Visual Basic

<System.Security.Permissions.PermissionSetAttribute(System.Security.Permissions.SecurityAction.Demand, Name:="FullTrust")> _
Protected Overrides Sub Render(Output As HtmlTextWriter)
    If HasControls() And TypeOf Controls(0) Is LiteralControl
        Dim Ctrl As LiteralControl = CType(Controls(0), LiteralControl)
        Output.Write("<H2>Your Message: " & Ctrl.Text & "</H2>")
    End If
End Sub

[System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name="FullTrust")] 
protected override void Render(HtmlTextWriter output) {
    if ( (HasControls()) && (Controls[0] is LiteralControl) ) {
        output.Write("<H2>Your Message: " + ((LiteralControl) Controls[0]).Text + "</H2>");
    }
}

JScript

protected override function Render(output : HtmlTextWriter) {
var securityperm : SecurityPermission;
         securityperm = new SecurityPermission(SecurityPermissionFlag.SerializationFormatter);
         securityperm.Demand();
    if ( (HasControls()) && (typeof(Controls[0]) == LiteralControl) ) {
        output.Write("<H2>Your Message: " + (LiteralControl(Controls[0])).Text + "</H2>");
    }
}

Platforms

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, 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

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

Reference

Control Class

Control Members

System.Web.UI Namespace

HtmlTextWriter

Other Resources

ASP.NET Page Life Cycle Overview