Control.Render Method (System.Web.UI)

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.NET Framework Class Library

Control.Render Method

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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

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

protected internal virtual void Render(
	HtmlTextWriter writer
)

Visual C++

protected public:
virtual void Render(
	HtmlTextWriter^ writer
)

abstract Render : 
        writer:HtmlTextWriter -> unit 
override Render : 
        writer:HtmlTextWriter -> unit

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>");
    }
}

Version Information

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

Platforms

Windows 8 Consumer Preview, Windows Server 8 Beta, Windows 7, Windows Server 2008 SP2, Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Reference

Control Class

System.Web.UI Namespace

HtmlTextWriter

Other Resources

ASP.NET Page Life Cycle Overview