How to load the background color to the drop-down box..

The effect picture is as follows

Some code: ------ ASPX page: Description: The drop-down box must be written The above form, use not implementation ------ CS page: use system; using system.componentmodel; using system.data; using system.data.sqlclient; using System.Configuration; using System.Data.Common; using System.Drawing; using System.Web; using System.Web.SessionState; using System.Web.UI; using System.Web.UI.WebControls; using System.Web. Ui.htmlcontrols; using system.reflection;

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