Sudoku.Form1.Box3_TextChanged C# (CSharp) Method

        private void Box3_TextChanged(object sender, EventArgs e)
        {
            int[,] arr = mapTableToArray(); CCC = new CheckCorrectCell(arr);
             if (CCC.checkCorrectCell9x9(0, 2) &&
             Box3.Text != ""){
                Box3.BackColor = Color.Red;} else
                Box3.BackColor = Color.White;
             congratulations9x9();
        }