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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>


.NET Framework

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

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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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