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Image.AlternateText Property

Gets or sets the alternate text displayed in the Image control when the image is unavailable. Browsers that support the ToolTips feature display this text as a ToolTip.

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

[BindableAttribute(true)]
public virtual string AlternateText { get; set; }
<asp:Image AlternateText="String" />

Property Value

Type: System.String
The alternate text displayed in the Image control when the image is unavailable.

Use this property to specify the text to display if the image specified in the ImageUrl property is not available. In browsers that support the ToolTips feature, this text also displays as a ToolTip.

The value of this property, when set, can be saved automatically to a resource file by using a designer tool. For more information, see LocalizableAttribute and ASP.NET Globalization and Localization.

TopicLocation
How to: Add Image Web Server Controls to a Web Forms PageBuilding ASP .NET Web Applications
How to: Add Image Web Server Controls to a Web Forms PageBuilding ASP .NET Web Applications
Walkthrough: Creating an Accessible Web ApplicationBuilding ASP .NET Web Applications in Visual Studio

The following example demonstrates how to use the AlternateText property to specify the alternate text to display for the image when the image is not available.

<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
    <title>Image Example</title>
</head>

<body>

   <form id="form1" runat="server">

      <h3>Image Example</h3>

      <asp:Image id="Image1" runat="server"
           AlternateText="Image text"
           ImageAlign="left"
           ImageUrl="images/image1.jpg"/>

   </form>

</body>
</html>

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), 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.

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