C# 选择弹框中DatatGridView的内容并返回该内容

1.DataGridView所在的窗体

//变量
        public delegate void GetDgRow(DataGridViewSelectedRowCollection rows);
        public virtual event GetDgRow EventShowRow;

//DataGridView 事件
#region 单击选择
        private void dgvParent_CellClick(object sender, DataGridViewCellEventArgs e)
        {
           if (e.RowIndex == -1) return;
            if (e.ColumnIndex == 0)
            {
                this.dgvParent["选择", e.RowIndex].Value = (this.dgvParent["选择", e.RowIndex].Value == null || this.dgvParent["选择", e.RowIndex].Value.ToString().ToLower() == "false") ? true : false;
                dgvParent.EndEdit();
            }
        }
#endregion

#region  快速选择
        /// <summary>
        ///快速选择
        ///Author:  
        ///WriteTime: 2014-01-22 23:49:40 
        /// </summary>
        protected override void QuickSelect()
        {
            try
            {
                int currentindex = dgvParent.CurrentRow.Index;
                dgvParent.CurrentCell = null;
                dgvParent.Rows[currentindex].Selected = true;
                if (EventShowRow != null)
                {
                    foreach (DataGridViewRow dr in dgvParent.Rows)
                    {
                        //判断选择行的选中状态，设置行是否是选中的。
                        if (dr.Cells["选择"].Value == null || dr.Cells["选择"].Value.ToString() == "False") continue;
                        dr.Selected = true;
                    }
                    DataGridViewSelectedRowCollection rows = dgvParent.SelectedRows;
                    EventShowRow(rows);
                    this.Close();
                }
            }
            catch (Exception ex)
            {
                Msg.InfoBox(ex.Message);
            }
        }
        #endregion

2.需要弹框选择的窗体-按钮事件

#region 选择产品
        private void txtProductNo_ButtonCustomClick(object sender, EventArgs e)
        {
            FrmProduct frm = new FrmProduct();
            frm.EventShowRow += new FrmProduct.GetDgRow(frm_EventShowRow);
            frm.Show();
        }

        void frm_EventShowRow(DataGridViewSelectedRowCollection row)
        {
            this.txtProductNo.Tag = row[0].Cells["_AutoID"].Value.ToString();
            this.txtProductNo.Text = row[0].Cells["STRITEMCODE"].Value.ToString();
        }
        #endregion