CssStyleCollection.Add Method (String, String)

 

Adds a style item to the CssStyleCollection of a control using the specified name/value pair.

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

Public Sub Add (
	key As String,
	value As String
)

Parameters

key
Type: System.String

The name of the new style attribute to add to the collection.

value
Type: System.String

The value of the style attribute to add to the collection.

Exception Condition
ArgumentNullException

key is null.

If the style item to add exists in the HtmlTextWriterStyle enumeration, use the overload of the Add method that takes an HtmlTextWriterStyle parameter because it is strongly typed. This means that items that are added will be included when viewing items with the get accessor of the Item property.

The following code example demonstrates how to use both overloads of the Add method to add a cascading style sheet to an HtmlSelect, HtmlInputSubmit, and a Label control programmatically.

<%@ Page Language="VB" %>

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

<script runat="server">

  Protected Sub SubmitBtn_Click(ByVal sender As Object, ByVal e As System.EventArgs)

    SubmitBtn.Style.Add("letter-spacing", "10px")
    FirstSelect.Style.Add(HtmlTextWriterStyle.Color, FirstSelect.Items(FirstSelect.SelectedIndex).Value.ToString())
    Message.Style.Add(HtmlTextWriterStyle.Color, FirstSelect.Items(FirstSelect.SelectedIndex).Value.ToString())
    Message.Text = "The select style is: " + FirstSelect.Style.Value

  End Sub

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>CssStyleCollection Add</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    Select a color and then click submit.
    <br />
    <select id="FirstSelect" 
            style="font: 10pt verdana;color:black;" 
            runat="server">
        <option value="black">black</option>
        <option value="red">red</option>
        <option value="blue">blue</option>
        <option value="green">green</option>
    </select> 
    <input id="SubmitBtn" 
           value="Submit" 
           type="submit" 
           onserverclick="SubmitBtn_Click"
           runat="server" /><br />
    <br />
    <asp:Label id="Message"
               runat="server"/>
    </div>
    </form>
</body>
</html>

.NET Framework
Available since 1.1
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