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    <p>Create a base page that you inherit all your pages from and set the theme in the OnPreInit event:</p> <pre><code>public class ThemePage : System.Web.UI.Page { protected override void OnPreInit(EventArgs e) { SetTheme(); base.OnPreInit(e); } private void SetTheme() { this.Theme = ThemeSwitcher.GetCurrentTheme(); } } </code></pre> <p>Below is the ThemeSwitcher utility class that handles getting/saving the current theme and listing themes. Since you said you're not using a database you can use Session:</p> <pre><code>public class ThemeSwitcher { private const string ThemeSessionKey = "theme"; public static string GetCurrentTheme() { var theme = HttpContext.Current.Session[ThemeSessionKey] as string; return theme ?? "Default"; } public static void SaveCurrentTheme(string theme) { HttpContext.Current.Session[ThemeSessionKey] = theme; } public static string[] ListThemes() { return (from d in Directory.GetDirectories(HttpContext.Current.Server.MapPath("~/app_themes")) select Path.GetFileName(d)).ToArray(); } } </code></pre> <p>You'll want a page where you can change the theme. Add a dropdownlist with the following code behind:</p> <pre><code>public partial class _Default : ThemePage { protected void Page_Load(object sender, EventArgs e) { if (!Page.IsPostBack) { BindData(); } } private void BindData() { var currentTheme = ThemeSwitcher.GetCurrentTheme(); foreach (var theme in ThemeSwitcher.ListThemes()) { var item = new ListItem(theme); item.Selected = theme == currentTheme; ddlThemes.Items.Add(item); } } protected void ddlThemes_SelectedIndexChanged(object sender, EventArgs e) { ThemeSwitcher.SaveCurrentTheme(ddlThemes.SelectedItem.Value); Response.Redirect("~/default.aspx"); } } </code></pre> <p>You can download the sample application <a href="http://storage.onfabrik.com/6724b018c1dfea1e/WebFormsThemeSwitcher.zip" rel="nofollow">here</a>.</p>
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    1. POHow to change a asp webapplication theme (not page) programmatically and during runtime?
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    1. COthank you for the code, it was the only thing worked, and I tried all of the above tutorials ! Pew! :)
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

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