How to: Set ASP.NET Server Control Style Properties Using ASP.NET Syntax
You can set style properties directly in the .aspx file in two ways.
To set style properties in the .aspx file
Declare the style property using a convention of hyphenating the style object name and property, as shown in the following example:
<asp:Calendar Id="MyCalendar" SelectionMode="DayWeek" runat="server" TitleStyle-Backcolor="#3366ff" TitleStyle-ForeColor="White" />
Declare explicit elements in which you declare property elements of the appropriate data type, as shown in the following example: