How To Edit Rows That I Have Created Dynamically..

<asp:GridView ID="grd_DSR" runat="server" AllowPaging="True"
          CellPadding="4" ForeColor="#333333"
          PageSize="3" Width="100%" AutoGenerateColumns="false"
          Height="16px" TabIndex="25"
          onrowcancelingedit="grd_DSR_RowCancelingEdit"   >
          <RowStyle BackColor="#F7F6F3" ForeColor="#333333" />
          <Columns>;

          ;

and my code behind file is:


 public  void loadDynamicGrid()
    {

        #region Code for preparing the DataTable

        #region constants
        string ProductName_Product_Types="ProductName/Product_Types";
        string Total_prise = "Total_Prise";
        DataSet ds;
        FillDsr fd = new FillDsr();
        fd.action = "SelectPackName";
        ds = fd.LoadPackName(fd);

        DataSet ds1;
        fd.action = "SelectPrdName";
        ds1 = fd.LoadProductName(fd);
          #endregion
        DataColumn dcol1 = new DataColumn("ProductName/Product_Types");
        dt.Columns.Add(dcol1);
       
               //Create an ID column for adding to the Datatable
        for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
        {

            DataColumn dcol = new DataColumn((ds.Tables[0].Rows[i]["pack_name"].ToString()), typeof(System.String));

            // dcol.AutoIncrement = true;

            dt.Columns.Add(dcol);

        }
        DataColumn dco2 = new DataColumn("Total_Prise");
        dt.Columns.Add(dco2);


            //Create an ID column for adding to the Datatable

            //  dcol = new DataColumn(NAME, typeof(System.String));

            //  dt.Columns.Add(dcol);

        

        //Now add data for dynamic columns

        //As the first column is auto-increment, we do not have to add any thing.

        //Let's add some data to the second column.


        //Create a new row

       
        for (int i = 0; i < ds1.Tables[0].Rows.Count; i++)
        {
            DataRow drow = dt.NewRow();
            drow[ProductName_Product_Types] = ds1.Tables[0].Rows[i][0].ToString();
            dt.Rows.Add(drow);


        }

            //Initialize the row data.

            //  drow[ds.Tables[0].Rows[0]["pack_name"].ToString()] = 0;



            //Add the row to the datatable.

           // dt.Rows.Add(drow);



        #endregion



        //Iterate through the columns of the datatable to set the data bound field dynamically.

        foreach (DataColumn col in dt.Columns)
        {

            
            BoundField bfield = new BoundField();

            bfield.DataField = col.ColumnName;
         
            //Initialize the HeaderText field value.
            bfield.HeaderText = col.ColumnName;
            //Add the newly created bound field to the GridView.


            grd_DSR.Columns.Add(bfield);

        }



        //Initialize the DataSource

        grd_DSR.DataSource = dt;
           grd_DSR.DataBind();

    }
i just want textboxes in cells when i clicked on button which is outside the textbox.