Как получить значение при движении курсора?

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Привет...

У меня есть три текстовых поля на динамическом добавлении строк.

Первые два предназначены для ввода чисел для умножения.
И третий - для отображения результата умножения.

Я хочу, чтобы результат умножения появился в третьем текстовом поле, как только я войду
цифры в первых двух текстовых полях, не нажимая никаких кнопок и даже не нажимая 3 текстовых поля .

Кто-нибудь знает, как это сделать?

Что я уже пробовал:

  private void SetInitialRow()
  {
      string lit1 = "First";
      string lit2 = "units @ Rs.";
      //string lit3 = "= Rs.";
      string lit3 = "=Rs1.";
      DataTable dt = new DataTable();
      DataRow dr = null;
      dt.Columns.Add(new DataColumn("First", typeof(string)));
      dt.Columns.Add(new DataColumn("Column2", typeof(string)));
      dt.Columns.Add(new DataColumn("Second", typeof(string)));
      dt.Columns.Add(new DataColumn("Column4", typeof(string)));
      dt.Columns.Add(new DataColumn("Third", typeof(string)));
      dt.Columns.Add(new DataColumn("Column6", typeof(string)));
     // dt.Columns.Add(new DataColumn("fourth", typeof(string)));
      //dt.Columns.Add(new DataColumn("Column8", typeof(string)));

      dr = dt.NewRow();
      dr["First"] = lit1;
      dr["Column2"] = string.Empty;
      dr["Second"] = lit2;
      dr["Column4"] = string.Empty;
      dr["Third"] = lit3;
      dr["Column6"] = string.Empty;
     // dr["fourth"] = lit4;
     // dr["Column8"] = string.Empty;
      dt.Rows.Add(dr);
      //dr = dt.NewRow();

      //Store the DataTable in ViewState
      ViewState["tbl_site_da_electricity"] = dt;
      Gridview1.DataSource = dt;
      Gridview1.DataBind();
  }

  protected void ButtonAdd_Click(object sender, EventArgs e)
  {
      AddNewRowToGrid();
  }


  private void AddNewRowToGrid()
  {
      int rowIndex = 0;
      string lit1 = "Next";
      string lit2 = "units @ Rs.";
      //string lit3 = "= Rs.";
      string lit3 = "=Rs1.";
      if (ViewState["tbl_site_da_electricity"] != null)
      {
          DataTable dtCurrentTable = (DataTable)ViewState["tbl_site_da_electricity"];
          DataRow drCurrentRow = null;
          if (dtCurrentTable.Rows.Count > 0)
          {
              for (int i = 1; i <= dtCurrentTable.Rows.Count; i++)
              {
                  //extract the TextBox values

                  TextBox box1 = (TextBox)Gridview1.Rows[rowIndex].Cells[1].FindControl("tb_first");
                  TextBox box2 = (TextBox)Gridview1.Rows[rowIndex].Cells[3].FindControl("tb_rupees");
                 // TextBox box3 = (TextBox)Gridview1.Rows[rowIndex].Cells[5].FindControl("tb_rowTotal");

                  TextBox box3 = (TextBox)Gridview1.Rows[rowIndex].Cells[5].FindControl("tb_rowTotal1");

                  drCurrentRow = dtCurrentTable.NewRow();
                  drCurrentRow["First"] = lit1;
                  dtCurrentTable.Rows[i - 1]["Column2"] = box1.Text;
                  drCurrentRow["Second"] = lit2;
                  dtCurrentTable.Rows[i - 1]["Column4"] = box2.Text;
                  drCurrentRow["Third"] = lit3;
                  dtCurrentTable.Rows[i - 1]["Column6"] = box3.Text;
                  //drCurrentRow["fourth"] = lit4;
                 // dtCurrentTable.Rows[i - 1]["Column8"] = box4.Text;

                  rowIndex++;
              }

              dtCurrentTable.Rows.Add(drCurrentRow);
              ViewState["tbl_site_da_electricity"] = dtCurrentTable;

              Gridview1.DataSource = dtCurrentTable;
              Gridview1.DataBind();
          }
      }
      else
      {
          Response.Write("ViewState is null");
      }

      //Set Previous Data on Postbacks
      SetPreviousData();
  }


  private void SetPreviousData()
  {
      int rowIndex = 0;
      if (ViewState["tbl_site_da_electricity"] != null)
      {
          DataTable dt = (DataTable)ViewState["tbl_site_da_electricity"];
          if (dt.Rows.Count > 0)
          {
              for (int i = 0; i < dt.Rows.Count; i++)
              {
                  TextBox box1 = (TextBox)Gridview1.Rows[rowIndex].Cells[1].FindControl("tb_first");
                  TextBox box2 = (TextBox)Gridview1.Rows[rowIndex].Cells[3].FindControl("tb_rupees");

                //  TextBox box3 = (TextBox)Gridview1.Rows[rowIndex].Cells[5].FindControl("tb_rowTotal");
                 TextBox box3 = (TextBox)Gridview1.Rows[rowIndex].Cells[5].FindControl("tb_rowTotal1");


                  box1.Text = dt.Rows[i]["Column2"].ToString();
                  box2.Text = dt.Rows[i]["Column4"].ToString();
                  box3.Text = dt.Rows[i]["Column6"].ToString();

                 // box4.Text = dt.Rows[i]["Column8"].ToString();
                  rowIndex++;
              }
          }
      }
  }

  protected void tb_rupees_TextChanged(object sender, EventArgs e)
  {
int rowIndex = 0;
     DataTable dt = (DataTable)ViewState["tbl_site_da_electricity"];
      int abc = 0;
      int aa = 0;
      if (dt.Rows.Count > 0)
      {
          for (int i = 0; i < dt.Rows.Count; i++)
          {
            (TextBox)Gridview1.Rows[rowIndex].Cells[1].FindControl("tb_first");


              TextBox box1 = (TextBox)Gridview1.Rows[rowIndex].Cells[1].FindControl("tb_first");
              TextBox box2 = (TextBox)Gridview1.Rows[rowIndex].Cells[3].FindControl("tb_rupees");
              TextBox box3 = (TextBox)Gridview1.Rows[rowIndex].Cells[5].FindControl("tb_rowTotal1");
              TextBox box4 = (TextBox)Gridview1.FooterRow.Cells[1].FindControl("tb_Total_Unit");
              TextBox box5 = (TextBox)Gridview1.FooterRow.Cells[5].FindControl("tb_alowdTotal");

        //char executive, superviser, workers;
              int a = 0, b = 0;

              a = Convert.ToInt32(box1.Text);
              b = Convert.ToInt32(box2.Text);
              aa = aa + Convert.ToInt32(box1.Text);
              if (tb_designation.Text.ToString() == "executive")
              {
                  if (aa <= 300)
                  {
                      box3.Text = (a * b).ToString();
                      abc = abc + Convert.ToInt32(box3.Text);
                  }
                  else
                  {
                      aa = aa - Convert.ToInt32(box1.Text);
                      box3.Text = ((300 - aa) * b).ToString();
                      abc = abc + Convert.ToInt32(box3.Text);
                      aa = 300;
                  }
              }
              else if (tb_designation.Text.ToString() == "supervisor")
              {
                  if (aa <= 250)
                  {
                      box3.Text = (a * b).ToString();
                      abc = abc + Convert.ToInt32(box3.Text);
                  }
                  else
                  {
                      aa = aa - Convert.ToInt32(box1.Text);
                      box3.Text = ((250 - aa) * b).ToString();
                      abc = abc + Convert.ToInt32(box3.Text);
                      aa = 250;
                  }
              }
              else if (tb_designation.Text.ToString() == "workers")
              {
                  if (aa <= 200)
                  {
                      box3.Text = (a * b).ToString();
                      abc = abc + Convert.ToInt32(box3.Text);
                  }
                  else
                  {
                      aa = aa - Convert.ToInt32(box1.Text);
                      box3.Text = ((200 - aa) * b).ToString();
                      abc = abc + Convert.ToInt32(box3.Text);
                      aa = 200;
                  }
              }


              box4.Text = aa.ToString();
              box5.Text = abc.ToString();


              rowIndex++;

          }
      }






  }

<pre><%
                 <fieldset>
                 <asp:UpdatePanel ID="updPanelelectricity" UpdateMode="Conditional" runat="server">
                    <ContentTemplate>
                
                <asp:GridView ID="Gridview1" runat="server" ShowFooter="true" AutoGenerateColumns="false"
                    GridLines="None" >
                    <Columns>
                   
                        <asp:BoundField DataField="First" />
                        <asp:TemplateField>
                            <ItemTemplate>
                               <asp:TextBox ID="tb_first" runat="server" Width="50px" autocomplete="off" ></asp:TextBox></ItemTemplate>
                           <FooterTemplate>
                                <asp:TextBox ID="tb_Total_Unit" runat="server" Width="50px"  ></asp:TextBox>
                                </FooterTemplate>
                        </asp:TemplateField>
                        <asp:BoundField DataField="Second" />
                        <asp:TemplateField>
                            <ItemTemplate>
                                <asp:TextBox ID="tb_rupees" runat="server" Width="50px" AutoPostBack="True"  OnTextChanged="tb_rupees_TextChanged"></asp:TextBox></ItemTemplate>
                        </asp:TemplateField>
                      

                        
                        <asp:BoundField DataField="Third" />
                         <asp:TemplateField>
                            <ItemTemplate>
                            <asp:TextBox ID="tb_rowTotal1" runat="server" Width="50px" ></asp:TextBox></ItemTemplate>
                            <FooterTemplate>
                             <asp:TextBox ID="tb_alowdTotal" runat="server" Width="50px" ></asp:TextBox></FooterTemplate>
                        </asp:TemplateField>
                          <asp:TemplateField>
                 
                            <FooterTemplate>
                                <asp:Button ID="ButtonAdd" runat="server" Text="Add" OnClick="ButtonAdd_Click" />
                            </FooterTemplate>
                        </asp:TemplateField>
                        
                    </Columns>
                </asp:GridView>
                </ContentTemplate> 
                
               </asp:UpdatePanel>
                </fieldset>

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