判断datagridview某列是否含有某字段
现在想循环遍历一个datagridview,判断其某列的值中是否含有“辊道”两字，如果有且其数量《15,则开关箱尺寸为600*400*1200，数量>15开关型尺寸为800*400*1200
------解决方案--------------------

DataTable dt = new DataTable();

            dt.Columns.Add("M_name", typeof(string));

            dt.Columns.Add("M_number", typeof(string));

            dt.Columns.Add("开关箱尺寸", typeof(string));



            dt.Rows.Add("滚到", "12", "");

            dt.Rows.Add("送辊", "1", "");

            dt.Rows.Add("滚辊道到", "162", "");



            this.dataGridView1.DataSource = dt;



            for (int i = 0; i < this.dataGridView1.Rows.Count; i++)

            {

                DataGridViewRow g = this.dataGridView1.Rows[i];

                if (g.Cells["M_name"].Value != null && g.Cells["M_name"].Value.ToString().Contains("辊道"))

                {

                    if (g.Cells["M_number"].Value != null)

                    {

                        if (Convert.ToInt32(g.Cells["M_number"].Value) > 15)

                        {

                            g.Cells["开关箱尺寸"].Value = "800*400*1200";

                        }

                        else

                        {

                &nb