Hello Ramesh925,

I have implement two possible approaches for you in the code shown at the end of the forum thread.

In the first approach I am iterating through all the cells and setting the Red backColor of those that match the null condition. (ultraButton1_Click)

In the second approach I am setting the valueBased appearance on the desired columns
(ultraButton2_Click)

Please let me me know if you have any other questions with this matter.

      OperatorCondition condition1;
        Infragistics.Win.Appearance appearance;
        ConditionValueAppearance valAppearance;
        public Form1()
        {
            InitializeComponent();
            DataTable dt = new DataTable();
            dt.Columns.Add("String1", typeof(string));
            dt.Columns.Add("String2", typeof(string));
            dt.Columns.Add("String3", typeof(string));

            dt.Rows.Add("a", null, "c");
            dt.Rows.Add("a", "b", "c");
            dt.Rows.Add("a", "b", null);
            dt.Rows.Add(null, "b", "c");
            dt.Rows.Add("a", null, "c");
            dt.Rows.Add("a", null, "c");
            dt.Rows.Add("a", null, "c");
            dt.Rows.Add("a", "b", null);
            dt.Rows.Add(null, "b", "c");


            ultraGrid1.DataSource = dt.DefaultView;

            condition1 = new OperatorCondition(ConditionOperator.IsNullOrEmpty, DBNull.Value);
            appearance = new Infragistics.Win.Appearance();
            appearance.BackColor = Color.Green;
            valAppearance = new ConditionValueAppearance();
            valAppearance.Add(condition1, appearance);

        }

        private void ultraButton1_Click(object sender, EventArgs e)
        {
            foreach (UltraGridRow row in ultraGrid1.Rows)
            {
                foreach (UltraGridCell cell in row.Cells)
                {
                    if (cell.Value == DBNull.Value)
                    {
                        cell.Appearance.BackColor = Color.Red;
                    }
                }
            }
         }

        private void ultraButton2_Click(object sender, EventArgs e)
        {
            ultraGrid1.DisplayLayout.Bands[0].Columns["String1"].ValueBasedAppearance = valAppearance;
        }
    }