Change the color of datagrid

private void ChangeColor(DataGrid dataGrid,string valueToComapre)
    {
        for (var row = 1; row < dataGrid.Items.Count; row++)
        {
            for (int col = 0; col < dataGrid.Columns.Count; col++)
            {
                if (dataGrid.Items[row].Cells[col].Text == valueToComapre)
                {
                    dataGrid.Items[row].Cells[col].BackColor = System.Drawing.Color.Green;
                }
                else
                {
                    dataGrid.Items[row].Cells[col].BackColor = System.Drawing.Color.Red;
                }
            }
        }

    }