How to apply CSS style to a Label in asp.net

asp.net example - label css style
Sometimes we need to more customize design on asp.net label control. the built in property of label control is not sufficient for apply all of customization. here we use a simple label control and a button control. when someone click the button then the label change it's appearance. label apply new font family, font color, text size, background color and italic style.
label-css-style.aspx 

<%@ Page Language="C#" AutoEventWireup="true"%>  
    
<!DOCTYPE html>
      
<script runat="server">
    protected void Button1_Click(object sender, System.EventArgs e)
    {
        Label1.CssClass = "labelstyle";
    }  
</script>      
      
<html xmlns="http://www.w3.org/1999/xhtml">      
<head id="Head1" runat="server">      
    <style type="text/css">
        .labelstyle {
          color:red;
          font-size:xx-large;
          font-family:'Comic Sans MS';
          background-color:snow;
          font-style:italic;
        }
    </style>      
    <title>asp.net example - label css style</title>
</head>      
<body>      
    <form id="form1" runat="server">      
    <div>      
        <h2 style="color:MidnightBlue; font-style:italic;">      
            asp.net example - label css style
        </h2>      
        <hr width="550" align="left" color="Gainsboro" />      
        <asp:Label       
            ID="Label1"       
            runat="server"      
            Text="sample label to test label css style."
            >      
        </asp:Label>      
        <br /><br /><br />
        <asp:Button   
            ID="Button1"   
            runat="server"   
            Text="label css style"  
            OnClick="Button1_Click"
            Height="40"  
            Font-Bold="true"  
            />  
    </div>      
    </form>      
</body>      
</html>
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