how to display data in text box and the text box in gridview in asp.net window application

public void loadToinletProduct(string id)
        {
            Connection objC1 = new Connection();
            SqlDataAdapter adp;
            DataSet ds = new DataSet();
            DataTable dt = new DataTable();
            SqlCommand cmd = new SqlCommand();

            cmd.CommandText = "select * from tblstudent where stuid=" + id;
            cmd.CommandType = CommandType.Text;
            cmd.Connection = objC1.objCon;

            try
            {
                objC1.objCon.Open();
                adp = new SqlDataAdapter(cmd);
                adp.Fill(ds);
                dt = ds.Tables[0];

                //Set AutoGenerateColumns False
                dataGridView2.AutoGenerateColumns = false;

                //Set Columns Count
                //dataGridView1.Refresh();
                dataGridView2.ColumnCount = 7;

                //    //Add Columns
                //dataGridView2.Columns[0].Name = "productName";
                //dataGridView2.Columns[0].HeaderText = "Product";
                //dataGridView2.Columns[0].DataPropertyName = "productName";
                which code to display in gridview in textbox

                dataGridView2.DataSource = dt;
            }
            catch (Exception ei)
            {
                MessageBox.Show(ei.Message);
            }
            finally
            {
                objC1.objCon.Close();
            }
        }