How to use theme and skin in asp.net TextBox

How to use theme and skin in TextBox
Theme is a collection of design property settings that allow us to define look of pages and controls. we can apply theme consistently across pages in a web application or across an entire web application or even all web applications in a server. theme hold skins, css, images and other resources. skin file is a file which extension is .skin and it contains property settings for individual controls such as TextBox, DropDownList, ListBox, Calendar, FileUpload etc. so that you can use theme and a skin file for store TextBox server control's specific design properties settings such as BackColor, ForeColor, BorderStyle etc. the following example code create a skin name Blue.skin that hold some textbox design property settings. we applied that theme in a web page by including it @Page directive Theme property value. copy and paste the following code on your .net IDE and run it for better understand how to use theme and skin in textbox server control.
TextBoxTheme.aspx 

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

<!DOCTYPE html>

<script runat="server">
    
</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title>How to use theme and skin in TextBox</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <h2 style="color:Green">TextBox Example: Theme</h2>
        <asp:Label 
             ID="Label1" 
             runat="server"
             Text="Favorite Forest"
             Font-Bold="true"
             Font-Size="Large"
             ForeColor="DodgerBlue"
             >
        </asp:Label>
        <asp:TextBox 
             ID="TextBox1" 
             runat="server"
             Text="Sundarban"
             >
        </asp:TextBox>
    </div>
    </form>
</body>
</html>
Blue.skin 

<asp:TextBox 
     runat="server"
     BackColor="IndianRed"
     ForeColor="Snow"
     Font-Size="X-Large"
     Font-Italic="true"
     Font-Underline="true"
     >
</asp:TextBox>
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