Change TextBox Border Color Identifying Issue During Validation

ASPX

<asp:textbox ID="textbox1" runat="server" />
<asp:CustomValidator ID="CustomValidator1" runat="server" ErrorMessage="*" onservervalidate="CustomValidator1_ServerValidate" />
<asp:Button ID="Button1" runat="server" Text="Button" /> 

Code Behind

protected void CustomValidator1_ServerValidate(object source, ServerValidateEventArgs args)
{
if (textbox1.Text == String.Empty)
{
textbox1.Style.Add("border", "solid 1px red");
args.IsValid = false;
}
} 
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