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Set border style dynamically (C#)

File: Default.aspx <%@ Page language="c#" Inherits="GreetingCardMaker" CodeFile="Default.aspx.cs" %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <html xmlns="http://www.w3.org/1999/xhtml">   <head>     <title>Greeting Card Maker</title>     </head>   <body>     <form runat="server">       <div>       <div >Choose a background color:<br />         <asp:dropdownlist ID="lstBackColor"                            runat="server"                            Height="22px"                            Width="194px"></asp:dropdownlist>         <br /><br />         Choose a font:<br />         <asp:dropdownlist ID="lstFontName"                            runat="server"                            Height="22px"                            Width="194px"></asp:dropdownlist>         <br /><br />                  Specify a numeric font size:<br />         <asp:textbox ID="txtFontSize" runat="server"></asp:textbox>         <br /><br />         Choose a border style:<br />         <asp:radiobuttonlist ID="lstBorder"                               runat="server"                               Height="59px"                               Width="177px"                               Font-Size="X-Small"></asp:radiobuttonlist>         <br /><br />         <asp:checkbox ID="chkPicture"                        runat="server"                        Text="Add the Default Picture"></asp:checkbox>         <br /><br />         Enter the greeting text below:<br />         <asp:textbox ID="txtGreeting"                       runat="server"                       Height="85px"                       Width="240px"                       TextMode="MultiLine"></asp:textbox>         <br /><br />         <asp:button ID="cmdUpdate"                      runat="server"                      Height="24px"                      Width="71px"                      Text="Update"                      onclick="cmdUpdate_Click"></asp:button>       </div>       <asp:panel ID="pnlCard" runat="server"        Height="507px" Width="339px"                       HorizontalAlign="Center"><br />&nbsp;            <asp:Label ID="lblGreeting"                       runat="server"                       Height="150px"                       Width="256px"></asp:Label>           <br /><br /><br />           <asp:Image ID="imgDefault"                       runat="server"                       Height="160px"                       Width="212px"                       Visible="False"></asp:Image>         </asp:panel>         </div>     </form>   </body> </html> File: Default.aspx.cs using System; using System.Collections; using System.ComponentModel; using System.Data; using System.Drawing; using System.Web; using System.Web.SessionState; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.HtmlControls; public partial class GreetingCardMaker : System.Web.UI.Page {   protected void Page_Load(object sender, System.EventArgs e)   {     if (this.IsPostBack == false)     {       lstBackColor.Items.Add("White");       lstBackColor.Items.Add("Red");       lstBackColor.Items.Add("Green");       lstBackColor.Items.Add("Blue");       lstBackColor.Items.Add("Yellow");       lstFontName.Items.Add("Times New Roman");       lstFontName.Items.Add("Arial");       lstFontName.Items.Add("Verdana");       lstFontName.Items.Add("Tahoma");             ListItem item = new ListItem();             item.Text = BorderStyle.None.ToString();             item.Value = ((int)BorderStyle.None).ToString();             lstBorder.Items.Add(item);             item = new ListItem();             item.Text = BorderStyle.Double.ToString();             item.Value = ((int)BorderStyle.Double).ToString();             lstBorder.Items.Add(item);             item = new ListItem();             item.Text = BorderStyle.Solid.ToString();             item.Value = ((int)BorderStyle.Solid).ToString();             lstBorder.Items.Add(item);            lstBorder.SelectedIndex = 0;       imgDefault.ImageUrl = "default.png";     }   }   protected void cmdUpdate_Click(object sender, System.EventArgs e)   {     pnlCard.BackColor = Color.FromName(lstBackColor.SelectedItem.Text);     lblGreeting.Font.Name = lstFontName.SelectedItem.Text;     try     {       if (Int32.Parse(txtFontSize.Text) > 0)       {         lblGreeting.Font.Size = FontUnit.Point(Int32.Parse(txtFontSize.Text));       }     }catch {     }     pnlCard.BorderStyle = (BorderStyle)Int32.Parse(lstBorder.SelectedItem.Value);     if (chkPicture.Checked == true)     {       imgDefault.Visible = true;     }else {       imgDefault.Visible = false;     }     lblGreeting.Text = txtGreeting.Text;   } }