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AttributeCollection.Add Method

Adds an attribute to a server control's AttributeCollection object.

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

public void Add(
	string key,
	string value
)

Parameters

key
Type: System.String

The attribute name.

value
Type: System.String

The attribute value.

If the string in the value parameter contains an ampersand (&), the character is automatically encoded. The resulting HTML representation is "&".

The following example shows how to use the Add method to programmatically add an attribute to an ASP.NET server control AttributeCollection object.

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

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">

    protected void SubmitBtn_Click(object sender, EventArgs e)
    {
        firstselect.Attributes.Add("Multiple", "True");
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>AttributeCollection Example</title>
</head>

 <body>
    <form id="form1" runat="server">
    <div>
    Make a selection:
    <select id="firstselect" 
            runat="server">
       <option>This</option>
       <option>That</option>
       <option>Other</option>
    </select>
    <br/><br/>

    <input type="submit" 
           id="submitbtn"
           value="modify attribute" 
           onserverclick="SubmitBtn_Click" 
           runat="server"/>
    </div>
 </form>
 </body>
 </html>

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

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