How to change control's background color when validation fails when controls have multiple validation

 Here Is the Code sample :

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace ValidationHelper
{
    public class ValidationBGColorAdjustor
    {
        public static void SetBGColor(Page page)
        {
            Dictionary<string, List> controls = new Dictionary<string, List>();

            foreach (BaseValidator validator in page.Validators)
            {
                if (controls.ContainsKey(validator.ControlToValidate))
                    controls[validator.ControlToValidate].Add(validator.IsValid);
                else
                    controls[validator.ControlToValidate] = new List() { validator.IsValid };
            }

            foreach (string s in controls.Keys)
            {
                bool IsValid = true;
                foreach (bool b in controls[s])
                    IsValid &= b;

                Control control = FindControlRecursive(page.Master,s);

                if (control != null)
                    ((WebControl)control).Attributes.Add("style", "background-color:"
                    + (IsValid ? "''" : "#FFCACA"));
            }
        }

        public static Control FindControlRecursive(Control root, string id)
        {
            if (root.ID == id)
                return root;

            foreach (Control Ctl in root.Controls)
            {
                Control FoundCtl = FindControlRecursive(Ctl, id);
                if (FoundCtl != null)
                    return FoundCtl;
            }
            return null;
        }
    }
}

calling method 

protected override void OnLoadComplete(EventArgs e)
        {
            ValidationBGColorAdjustor.SetBGColor(Page);
            base.OnLoadComplete(e);
        }