我想增加新数据后，可以像未加新数据前那样，点击datagridview可以在textbox中显示对应内容。请问如何才可？

private void button2_Click(object sender, EventArgs e)
            {
                string thiscncode = cn_SoftCodeTextBox.Text.Trim();
                OleDbConnection thisconn = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + System.Windows.Forms.Application.StartupPath + "/CnEduCode.mdb");

                OleDbCommand mycomm = new OleDbCommand();
                mycomm.Connection = thisconn;//初始化connection
                = "select Cn_SoftCode from Cn_SoftWare where Cn_SoftCode ='" + thiscncode + "'";

                thisconn.Open();//打开连接               

                OleDbDataReader thisread = mycomm.ExecuteReader();

                if (thisread.Read())
                {
                    MessageBox.Show("软件代号已存在，请重新输入！");
                    thisread.Close();
                    return;
                }
                else
                {
                    string article = "insert into Cn_SoftWare (Cn_SoftName,Cn_Remark,Cn_SoftCode) values('" + cn_SoftNameTextBox.Text + "','" + cn_RemarkTextBox.Text + "' ,'" + cn_SoftCodeTextBox.Text + "')";

                    OleDbCommand comm = new OleDbCommand(article, thisconn);//创建Command命令对象

                    comm.ExecuteNonQuery();//执行命令
                                   
                    MessageBox.Show("添加完成！");
                }               
                databind(); //datagridview即时显示数据库内容  
                thisconn.Close();//关闭连接
                return;         

            }

不要笑我，我很低级的！