Update GridView row on Update Button click ASP.Net

Refer

GridView - Add Edit Update Delete and Paging the AJAX way

  protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)  

     {  

         GridViewRow row = (GridViewRow)GridView1.Rows[e.RowIndex];  

        Label lbl = (Label)row.FindControl("lblid");  

        TextBox textname = (TextBox)row.FindControl("textbox1");  

        TextBox textmarks = (TextBox)row.FindControl("textbox2"); 

         GridView1.EditIndex = -1;  

        conn.Open();  

        SqlCommand cmd = new SqlCommand("update  emp set marks=" + textmarks.Text + " , name='" + textname.Text + "' where rowid=" + lbl.Text + "", conn); 

        cmd.ExecuteNonQuery();  

         conn.Close();  

         bind();          

     }  

     public void bind()  

     {  

         conn.Open();  

         SqlDataAdapter da = new SqlDataAdapter("select * from emp", conn);  

         DataSet ds = new DataSet();  

         da.Fill(ds, "emp");  

         GridView1.DataSource = ds.Tables[0];  

        GridView1.DataBind();  

        conn.Close();  

     }  

jmal, i have applied the following piece of code regarding row update

protected void noticeDetails_RowUpdating(object sender, GridViewUpdateEventArgs e)
       {
    Label lblId = (Label)dt.Rows[e.RowIndex].FindControl("");//your table id which in a label 
    TextBox txtName = (TextBox)noticeDetails.Rows[e.RowIndex].FindControl("txtCampaignIDRange");
    TextBox txtName1 = (TextBox)noticeDetails.Rows[e.RowIndex].FindControl("txtPromoStartDate");
    TextBox txtName2 = (TextBox)noticeDetails.Rows[e.RowIndex].FindControl("txtPromoEndDate");
    TextBox txtName3 = (TextBox)noticeDetails.Rows[e.RowIndex].FindControl("txtExecutionDate");
    TextBox txtName4 = (TextBox)noticeDetails.Rows[e.RowIndex].FindControl("txtExpiryDate");
      noticeDetails.EditIndex = -1;    BindData();    }

but it gives error at     Label lblId = (Label)dt.Rows[e.RowIndex].FindControl("lblId");

"system.data.datarow does not contain definition of findcontroll and no extension

method find controll  could not accept the accepting a first argument of type

system.data.datarow

what should i do about this!

To solve problem copy the same Label in EditItemTemplate

Can you tell me how can i copy the same label in edititem Template

here is the aspx code

<asp:GridView ID="noticeDetails" runat="server" BorderWidth="1px" AutoGenerateColumns="false" PageSize="10" Width="10%" CellPadding="10"
           AllowSorting="true"   AllowPaging="true"  AutoGenerateEditButton="true" onrowediting="noticeDetails_RowEditing" onRowUpdating="noticeDetails_updating"
           onrowcancelingediting="noticeDetails_Rowcancelingediting"
          >               <Columns>
           <asp:TemplateField HeaderText="CampaignIDRange">
          <ItemTemplate>            <%# Eval("CampaignIDRange")%>
          </ItemTemplate>                    <EditItemTemplate>
            <asp:TextBox runat="server" ID="txtCampaignIDRange" Text='<%# Eval("CampaignIDRange")%>' />
                  </EditItemTemplate>           </asp:TemplateField>
                       <asp:TemplateField HeaderText="PromoStartDate">
          <ItemTemplate>          <%# Eval("PromoStartDate")%>
          </ItemTemplate>          <EditItemTemplate>
           <asp:TextBox runat="server" ID="txtPromoStartDate" Text='<%# Eval("PromoStartDate")%>' />
          </EditItemTemplate>      </asp:TemplateField>           
           <asp:TemplateField HeaderText="PromoEndDate">
          <ItemTemplate>            <%# Eval("PromoEndDate")%>
          </ItemTemplate>          <EditItemTemplate>
            <asp:TextBox runat="server" ID="txtPromoEndDate" Text='<%# Eval("PromoEndDate")%>' />
          </EditItemTemplate>      </asp:TemplateField>            
           <asp:TemplateField HeaderText="ExecutionDate">
          <ItemTemplate>           <%# Eval("ExecutionDate")%>
          </ItemTemplate>          <EditItemTemplate>
           <asp:TextBox runat="server" ID="txtExecutionDate" Text='<%# Eval("ExecutionDate")%>' />
          </EditItemTemplate>      </asp:TemplateField>             
           <asp:TemplateField HeaderText="ExpiryDate">
          <ItemTemplate>          <%# Eval("ExpiryDate")%>
          </ItemTemplate>          <EditItemTemplate>
           <asp:TextBox runat="server" ID="txtExpiryDate" Text='<%# Eval("ExpiryDate")%>' />
          </EditItemTemplate>      </asp:TemplateField>
              </Columns>    </asp:GridView>    </div>