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WebControl.Width Property

Gets or sets the width of the Web server control.

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

public virtual Unit Width { get; set; }
<asp:WebControl Width="Unit" />

Property Value

Type: System.Web.UI.WebControls.Unit
A Unit that represents the width of the control. The default is Empty.


The width of the Web server control was set to a negative value.

Use the Width property to specify the width of the Web server control.


This property does not render for all controls in browsers earlier than Microsoft Internet Explorer version 4. Controls that do not render this property in earlier browsers include Label, HyperLink, LinkButton, and any validation controls. The CheckBoxList, RadioButtonList and DataList also do not render this property in earlier browsers when their RepeatLayout property is set to RepeatLayout.Flow. Furthermore, only unit types of Pixel and Percentage are supported in earlier browsers.

Because this property is nonstandard HTML, Web server controls that display as a table, such as Table and DataGrid, do not support this property in browsers earlier than Microsoft Internet Explorer version 4.


To set the Width property declaratively to a unit type other than the default of Pixel, you must create a new unit type specific to the unit type you want. For example, to set a control's Width property to a percentage value of 100, you could do the following:

myWebControl.width = Unit.Percentage(100);

For more information on the unit types available for the Width property, see the Unit class.

The following example illustrates how to declaratively set the Width property of the Table control, inherited from the WebControl base class.

<%@ Page Language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"  

<html xmlns="" >
<head id="Head2" runat="server">
    <title>WebControl Example</title>
    <form id="form1" runat="server">

    <h3>Width Property of a Web Control</h3>
    <asp:Table id="Table1" runat="server"
        CellPadding="10" GridLines="Both"

                Row 0, Col 0

                Row 0, Col 1

                Row 1, Col 0

                Row 1, Col 1



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.

.NET Framework

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