Dynamic Dropdown

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C#

Hi I am developing dynamic table with dropdown list when i click on add button it will show one dynamic table with Add button for creating another dynamic table i will fill data and stored in database

look on my code below

private void AddNewRowToGrid()
   {
       int rowIndex = 0;
       if (ViewState["CurrentTable"] != null)
       {
           DataTable dtCurrentTable = (DataTable)ViewState["CurrentTable"];
           DataRow drCurrentRow = null;
           if (Gridview1.Rows.Count > 0)
           {
               int intRow = Gridview1.Rows.Count;
               DropDownList val1 = (DropDownList)Gridview1.Rows[intRow - 1].Cells[1].FindControl("txtItemCode");


               TextBox val2 = (TextBox)Gridview1.Rows[intRow - 1].Cells[2].FindControl("txtDescription");
               TextBox val3 = (TextBox)Gridview1.Rows[intRow - 1].Cells[3].FindControl("txtUOM");
               TextBox val4 = (TextBox)Gridview1.Rows[intRow - 1].Cells[4].FindControl("txtRequestQty");
           //  TextBox val5 = (TextBox)Gridview1.Rows[intRow - 1].Cells[5].FindControl("txtAmount");

                   for (int i = 0; i < Gridview1.Rows.Count; i++)
                   {
                       //extract the TextBox values
                       //Label lblSno = (Label)Gridview1.Rows[rowIndex].Cells[0].FindControl("lblSno");
                       DropDownList box1 = (DropDownList)Gridview1.Rows[rowIndex].Cells[1].FindControl("txtItemCode");
                       TextBox box2 = (TextBox)Gridview1.Rows[rowIndex].Cells[2].FindControl("txtDescription");
                       TextBox box3 = (TextBox)Gridview1.Rows[rowIndex].Cells[3].FindControl("txtUOM");
                       TextBox box4 = (TextBox)Gridview1.Rows[rowIndex].Cells[4].FindControl("txtRequestQty");
                  //  TextBox box5= (TextBox)Gridview1.Rows[rowIndex].Cells[5].FindControl("txtAmount");

                       //dtCurrentTable.Rows[i][strSno] = lblSno.Text;
                       dtCurrentTable.Rows[i][ItemCode] = box1.Text;
                       dtCurrentTable.Rows[i][strDescription] = box2.Text;
                       dtCurrentTable.Rows[i][UOM] = box3.Text;
                       dtCurrentTable.Rows[i][RequestQty] = box4.Text;
                     //  dtCurrentTable.Rows[i][Amount] = (Convert.ToInt32(box3.Text.ToString().Trim()) * Convert.ToInt32(box4.Text.ToString().Trim()));

                       rowIndex++;
                   }
                   drCurrentRow = dtCurrentTable.NewRow();

                   //add new row to DataTable
                   dtCurrentTable.Rows.Add(drCurrentRow);

                   for (int i = 1; i <= dtCurrentTable.Rows.Count; i++)
                   {
                       // DataRow dr = null;
                       //dr[strSno] = i;
                       dtCurrentTable.Rows[i - 1][strSno] = i;
                   }
                   dtCurrentTable.AcceptChanges();
                   //Store the current data to ViewState
                   ViewState["CurrentTable"] = dtCurrentTable;
                   //Rebind the Grid with the current data
                   Gridview1.DataSource = dtCurrentTable;
                   Gridview1.DataBind();
           }
       }
       else
       {
           Response.Write("ViewState is null");
       }
   }
   protected void ButtonAdd_Click(object sender, EventArgs e)
   {
       AddNewRowToGrid();
   }

99% of my code is fine but when I click on add button for creating new dynamic table the first table dropdown selected item changed to first list item how to maintain view state?

[Edit]Code is wrapped in "pre" tags[/Edit]