How to change the BackgroundColor of a page based on the value selected in a DropdownList

<asp:DropDownList id='DropDownList1' runat='server' AutoPostBack='True'>
	<asp:ListItem Value='Red'>Red</asp:ListItem>
	<asp:ListItem Value='Blue'>Blue</asp:ListItem>
	<asp:ListItem Value='Green'>Green</asp:ListItem>
</asp:DropDownList>

VB.NET

Page.RegisterClientScriptBlock('BodyStyle', '<style type=’text/css’>body{background-color: ' + DropDownList1.SelectedItem.Value + ';}</style>')

C#

Page.RegisterClientScriptBlock('BodyStyle', '<style type=’text/css’>body{background-color: ' + DropDownList1.SelectedItem.Value + ';}</style>');