Apply ASP.NET Themes Programmatically

Theme and skin preferences in page declarations and configuration files, you can apply themes programmatically. You can set both page themes and style sheet themes programmatically; however, the procedure for applying each type of theme is different.

Apply a page theme programmatically

In a handler for the page's PreInit method, set the page's Theme property.

The following example shows how to set a page's theme conditionally based on a value passed in the query string.

protected void Page_PreInit(object sender, EventArgs e)
{
switch (Request.QueryString["theme"])
{
case "Blue":
Page.Theme = "BlueTheme";
break;
case "Pink":
Page.Theme = "PinkTheme";
break;
}
}

Apply a style sheet theme programmatically

In the page's code, override the StyleSheetTheme property and in the get accessor, return the name of the style sheet theme.

The following code example shows how to set a theme named BlueTheme as the style sheet theme for a page:

public override String StyleSheetTheme
{
get { return "BlueTheme"; }
}

Apply control skins programmatically

In a handler for the page's PreInit method, set the control's SkinID property.

The following code example shows how to set the SkinID property of a Calendar control. This example assumes that the the page's theme has already been set.

void Page_PreInit(object sender, EventArgs e)
{
Calendar1.SkinID = "CustomSkin";
}