DataGrid行单元格合并显示 (增加交错行颜色设置)

//绑定数据集
        public void BindGrid()
        {
            DataSet ds = new DataSet();
            sqlDataAdapter2.Fill(ds);
            DataGrid2.DataSource = ds.Tables[0];
            DataGrid2.DataBind();
            //合并相同的单元格
            string strTemp;
            int intSpan = 0;
            int nowSpan = 0;
            bool flag = false;
            int i, j;
            for(i = 0; i < DataGrid2.Items.Count; i++)
            {
                intSpan = 1;
                strTemp = DataGrid2.Items[i].Cells[0].Text;

                if (flag == true)
                {
                    flag = false;
                    DataGrid2.Items[i].BackColor = Color.SkyBlue;
                    for(j = i + 1; j< DataGrid2.Items.Count; j++)
                    {
                        if(String.Compare(strTemp,DataGrid2.Items[j].Cells[0].Text)==0)
                        {
                            intSpan = intSpan + 1;
                            DataGrid2.Items[i].Cells[0].RowSpan = intSpan;
                            //DataGrid2.Items[i].Cells[1].RowSpan = intSpan;
                            //DataGrid2.Items[i].Cells[2].RowSpan = intSpan;
                            DataGrid2.Items[i].Cells[3].RowSpan = intSpan;

                            DataGrid2.Items[j].BackColor = Color.SkyBlue;

                            DataGrid2.Items[j].Cells[0].Visible = false;
                            //DataGrid2.Items[j].Cells[1].Visible = false;
                            //DataGrid2.Items[j].Cells[2].Visible = false;
                            DataGrid2.Items[j].Cells[3].Visible = false;

                        }
                    }
                }
                else
                {
                    DataGrid2.Items[i].BackColor = Color.White;
                    flag = true;
                    for(j = i + 1; j< DataGrid2.Items.Count; j++)
                    {
                        if(String.Compare(strTemp,DataGrid2.Items[j].Cells[0].Text)==0)
                        {
                            intSpan = intSpan + 1;
                            DataGrid2.Items[i].Cells[0].RowSpan = intSpan;
                            //DataGrid2.Items[i].Cells[1].RowSpan = intSpan;
                            //DataGrid2.Items[i].Cells[2].RowSpan = intSpan;
                            DataGrid2.Items[i].Cells[3].RowSpan = intSpan;

                            DataGrid2.Items[j].BackColor = Color.White;

                            DataGrid2.Items[j].Cells[0].Visible = false;
                            //DataGrid2.Items[j].Cells[1].Visible = false;
                            //DataGrid2.Items[j].Cells[2].Visible = false;
                            DataGrid2.Items[j].Cells[3].Visible = false;

                        }
                    }
                }
                
                nowSpan += intSpan;
                i = nowSpan - 1;

            }

        }