datagridview keypress 事件为何选中最后一条记录

模糊查询到数据加载到datagridview 中,想用keypress事件选中行的记录并放到相应的容器中,但有很多记录时选中的是最后一行数据,请大家赐教.

datagridview 加载时代码:
private void txt_byName_KeyPress(object sender, KeyPressEventArgs e)
        {
            //if (e.KeyChar == 13)
            //{
                string sql = "select a.CP_id,a.CP_name,a.CP_xh,a.CP_sbh,a.CP_dw,a.CP_jj,a.CP_SJ,a.JH_SL,a.GHS_id,a.BZ,b.CP_byName " +
                            "from LZ_ZKCB a ,CLinfo b where a.CP_id=b.CP_id  and b.CP_byName like '%" + txt_byName.Text + "%'";
                my_ds = new DataSet();
                my_ds = my_Service.RunProca(sql, my_ds);
                //if (my_ds.Tables[0].Rows.Count > 1)
                //{
                    dataGridView1.Visible = true;
                    dataGridView1.Focus();

                    my_tb = new DataTable();
                    my_tb = my_ds.Tables[0];
                    my_tb.Columns.Add("序号");
                    int iCount = 0;
                    foreach (DataRow row in my_tb.Rows)
                    {
                        iCount += 1;
                        row.BeginEdit();
                        row["序号"] = iCount.ToString();
                        row.EndEdit();
                    }
                    my_tb.DefaultView.AllowDelete = true;
                    my_tb.DefaultView.AllowEdit = true;
                    my_tb.DefaultView.AllowNew = false;
                    this.dataGridView1.DataSource = my_tb.DefaultView;
                    //dataGridView1.Rows[0].Selected = true;
                //}
                //else
                //{
                //    foreach (DataRow arow in my_ds.Tables[0].Rows)
                //    {
                //        txt_byName.Text = arow["CP_byName"].ToString();
                //        txt_BZ.Text = arow["BZ"].ToString();
                //        txt_id.Text = arow["CP_id"].ToString();
                //        txt_JJ.Text = arow["CP_jj"].ToString();
                //        txt_Name.Text = arow["CP_name"].ToString();
                //        txt_SBH.Text = arow["CP_sbh"].ToString();
                //        txt_SJ.Text = arow["CP_SJ"].ToString();
                //        txt_XH.Text = arow["CP_xh"].ToString();
                //        txt_SL.Text = arow["JH_SL"].ToString();
                //        cob_DW.Text = arow["CP_dw"].ToString();
                //        cob_GHS.Text = arow["GHS_id"].ToString();
                //    }
                //}
            //}
        }

以下是KeyPress事件代码:
private void dataGridView1_KeyPress(object sender, KeyPressEventArgs e)
        {
            //if (e.KeyChar == 13)
            //{
                foreach (DataGridViewRow arow in this.dataGridView1.SelectedRows)
                {
                    txt_byName.Text = arow.Cells["CP_byName"].Value.ToString();
                    txt_BZ.Text = arow.Cells["BZ"].Value.ToString();
                    txt_id.Text = arow.Cells["CP_id"].Value.ToString();
                    txt_JJ.Text = arow.Cells["CP_jj"].Value.ToString();
                    txt_Name.Text = arow.Cells["CP_name"].Value.ToString();
                    txt_SBH.Text = arow.Cells["CP_sbh"].Value.ToString();
                    txt_SJ.Text = arow.Cells["CP_SJ"].Value.ToString();
                    txt_XH.Text = arow.Cells["CP_xh"].Value.ToString();
                    txt_SL.Text = arow.Cells["JH_SL"].Value.ToString();
                    cob_DW.Text = arow.Cells["CP_dw"].Value.ToString();
                    cob_GHS.Text = arow.Cells["GHS_id"].Value.ToString();
                    dataGridView1.Visible = false;
                }
            //}
        } --------------------编程问答-------------------- 这不废话..
如果选中有2行,你循环这2行
然后往控件赋值
那你的第2行肯定覆盖了1行的值啊
你有多少行就应该拿多少个容器来存放这些值!
--------------------编程问答-------------------- dataGridView1.SelectedRows dataGridView1里面只能有一行被选中.

补充：.NET技术 ,  C#