CSS and Theme in ASP.NET 2.0 and C#

In this tutorial, we will show you how to use CSS and Theme to define the style of the page in ASP.NET 2.0 and C#.

We will use the namespace of System.Web.UI in this tutorial.

using System.Web.UI

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Please add two controls of labels, textboxs and buttons to the webpage page, and a control of dropdownlist to select color of controls in the page. Then please create theme folder of BlueTheme and PurpleTheme, and add Control.skin, Default.css to the folders.

protected void Page_PreInit(object sender, EventArgs e) { Page.Theme = Request["ChooseTheme"]; } 'Control.skin of the BlueTheme <asp:TextBox BackColor="#c4d4e0" ForeColor="#0b12c6" Runat="Server" /> <asp:Label ForeColor="#0b12c6" Runat="Server" /> <asp:Button BackColor="#c4d4e0" ForeColor="#0b12c6" Runat="Server" /> 'Control.skin of the PurpleTheme <asp:TextBox BackColor="#ccccff" ForeColor="#602bff" Runat="Server" /> <asp:Label ForeColor="#602bff" Runat="Server" /> <asp:Button BackColor="#ccccff" ForeColor="#602bff" Runat="Server" />

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The front end Default.aspx page looks something like this:

<fieldset> <legend>Asp.net2.0 Theme Demo</legend> <table width="100%" cellpadding="0" cellspacing="0" border="0" class="tableStyle"> <tr> <td colspan="2" align="center"> Select a theme of the page: <asp:dropdownlist id="ChooseTheme" runat="server" autopostback="true"> <asp:ListItem Value="BlueTheme">Select Color</asp:ListItem> <asp:ListItem Value="BlueTheme">Blue</asp:ListItem> <asp:ListItem Value="PorpleTheme">Purple</asp:ListItem> </asp:dropdownlist> </td> </tr><tr> <td height="23px" class="tdStyle" colspan="2"></td> </tr> <tr> <td align="center" height="52px" style="width: 513px; text-align: right;"> <asp:Label ID="Label1" runat="server" Text="Enter Your Name:" Width="141px"></asp:Label>&nbsp; </td> <td> <asp:TextBox ID="TextBox2" runat="server"></asp:TextBox> </td> </tr> <tr> <td align="center" height="52px" style="width: 513px; text-align: right;"> &nbsp;<asp:Label ID="Label2" runat="server" Text="Enter Your Nickname:" Width="164px"></asp:Label>&nbsp;</td> <td> <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox> </td> </tr> <tr> <td align="center" height="50px" style="width: 513px; text-align: right;"> <asp:Button ID="Button1" runat="server" Text=" OK " />&nbsp; </td> <td> <asp:Button ID="Button2" runat="server" Text="Cancel" /> </td> </tr> <tr> <td height="23px" colspan="2"></td> </tr> <tr> <td colspan="2"><br /><br /></td> </tr> </table> </fieldset>

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The flow for the code behind page as follows.

using System; using System.Data; using System.Configuration; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Web.UI.HtmlControls; public partial class _Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { } protected void Page_PreInit(object sender, EventArgs e) { Page.Theme = Request["ChooseTheme"]; } }

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