как заполнить выпадающий список на основе выбора другого dropdownlist в gridview

Question

У меня есть gridview с его собственным sqlDataSource. В строке нижнего колонтитула у меня есть поле Insert, чтобы создать новую строку. Однако эта строка нижнего колонтитула довольно сложная, и я пытаюсь понять, как заставить ее работать.

Что бы я хотел видеть, так это то, что пользователь выбирает имя OTypeName ddl. Основываясь на этом выборе, OSpecies ddl включен и заполняет значения на основе ODypeName ddl. То же самое можно сказать о OSpecies и OVariety.

Затем пользователь вводит свою собственную информацию в OAge, OYields, OPlantDate и OPlantFrom.

Остальные поля в нижнем колонтитуле являются метками, которые будут заполнены на основе окончательного выбора OVariety.

Кнопка Insert добавляет все эти столбцы в gridview.

Мне нужна помощь только с заполнением одного ddl на основе выбора ddl другого и как заполнить метку на основе выбора ddl.

Вот мой код в файле ASPX:

<%@ Page Title="" Language="C#" MasterPageFile="~/Permaculture.Master" AutoEventWireup="true" CodeBehind="OrchardMainWebForm.aspx.cs" Inherits="PermacultureOrganizer.OrchardMainWebForm" %> 
<asp:Content ID="Content1" ContentPlaceHolderID="head" runat="server"> 
</asp:Content> 
<asp:Content ID="Content2" ContentPlaceHolderID="Content" runat="server" > 
<asp:GridView ID="gvOrchardData" runat="server" AllowSorting="True" AutoGenerateColumns="False" DataKeyNames="OUserOrchardID" DataSourceID="dsOrchardDatabase" CellPadding="4" CellSpacing="4" ForeColor="#333333" GridLines="Vertical" AutoGenerateDeleteButton="True" AutoGenerateEditButton="True" ShowFooter="True" Font-Bold="False"> 
<AlternatingRowStyle BackColor="White" /> 
<Columns> 
<asp:TemplateField HeaderText="OUserOrchardID" InsertVisible="False" SortExpression="OUserOrchardID"> 
<EditItemTemplate> 
<asp:Label ID="Label1" runat="server" Text='<%# Eval("OUserOrchardID") %>'></asp:Label> 
</EditItemTemplate> 
<ItemTemplate> 
<asp:Label ID="Label1" runat="server" Text='<%# Bind("OUserOrchardID") %>'></asp:Label> 
</ItemTemplate> 
<FooterTemplate> 
<asp:LinkButton ID="lbInsert" 
runat="server" 
OnClick="lbInsert_Click" ForeColor="White">Insert</asp:LinkButton> 
</FooterTemplate> 
</asp:TemplateField> 
<asp:TemplateField HeaderText="OTypeName" SortExpression="OTypeName"> 
<EditItemTemplate> 
<asp:DropDownList ID="DropDownList1" 
runat="server" 
AutoPostBack="True" 
DataSourceID="dsTypeName" 
DataTextField="OrchardTypeName" 
DataValueField="OrchardTypeID" > 
</asp:DropDownList> 
<asp:SqlDataSource ID="dsTypeName" runat="server" ConnectionString="<%$ ConnectionStrings:DB_9DE518_PermacultureConnectionString %>" SelectCommand="SELECT * FROM [tblOrchardType]"></asp:SqlDataSource> 
</EditItemTemplate> 
<ItemTemplate> 
<asp:Label ID="Label2" runat="server" Text='<%# Bind("OTypeName") %>'></asp:Label> 
</ItemTemplate> 
<FooterTemplate> 
<asp:DropDownList ID="ddlTypeName" 
runat="server" 
AutoPostBack="True" 
DataSourceID="dsTypeName" 
DataTextField="OrchardTypeName" 
DataValueField="OrchardTypeID" 
> 
</asp:DropDownList> 
<asp:SqlDataSource ID="dsTypeName" runat="server" ConnectionString="<%$ ConnectionStrings:DB_9DE518_PermacultureConnectionString %>" SelectCommand="SELECT * FROM [tblOrchardType]"></asp:SqlDataSource> 
</FooterTemplate> 
</asp:TemplateField> 
<asp:TemplateField HeaderText="OSpecies" SortExpression="OSpecies"> 
<EditItemTemplate> 
<asp:DropDownList ID="DropDownList2" 
runat="server" 
SelectedValue='<%# Bind("OSpecies") %>' 
AutoPostBack="True" 
DataSourceID="dsSpecies" 
DataTextField="Species" 
DataValueField="OrchardTypeID"> 
<asp:ListItem>Select Species</asp:ListItem> 
</asp:DropDownList> 
<asp:SqlDataSource ID="dsSpecies" runat="server" ConnectionString="<%$ ConnectionStrings:DB_9DE518_PermacultureConnectionString %>" SelectCommand="SELECT [Species], [OrchardTypeID] FROM [tblOrchardItem]"></asp:SqlDataSource> 
</EditItemTemplate> 
<ItemTemplate> 
<asp:Label ID="Label3" runat="server" Text='<%# Bind("OSpecies") %>'></asp:Label> 
</ItemTemplate> 
<FooterTemplate> 
<asp:DropDownList ID="ddlSpecies" 
runat="server" 
AutoPostBack="True" 
DataSourceID="dsSpecies" 
DataTextField="Species" 
DataValueField="OrchardTypeID" 
> 
<asp:ListItem>Select Species</asp:ListItem> 
</asp:DropDownList> 
<asp:SqlDataSource ID="dsSpecies" runat="server" ConnectionString="<%$ ConnectionStrings:DB_9DE518_PermacultureConnectionString %>" SelectCommand="SELECT [Species], [OrchardTypeID] FROM [tblOrchardItem]"> 
</asp:SqlDataSource> 
</FooterTemplate> 
</asp:TemplateField> 
<asp:TemplateField HeaderText="OVariety" SortExpression="OVariety"> 
<EditItemTemplate> 
<asp:DropDownList ID="DropDownList3" 
runat="server" 
AutoPostBack="True" 
DataSourceID="dsVariety" 
DataTextField="Variety" 
DataValueField="OrchardTypeID"> 
</asp:DropDownList> 
<asp:SqlDataSource ID="dsVariety" runat="server" ConnectionString="<%$ ConnectionStrings:DB_9DE518_PermacultureConnectionString %>" SelectCommand="SELECT [Variety], [OrchardTypeID] FROM [tblOrchardItem]"></asp:SqlDataSource> 
</EditItemTemplate> 
<FooterTemplate> 
<asp:DropDownList ID="ddlVariety" 
runat="server" 
AutoPostBack="True" 
DataSourceID="dsVariety" 
DataTextField="Variety" 
DataValueField="OrchardTypeID" 
> 
</asp:DropDownList> 
<asp:SqlDataSource ID="dsVariety" runat="server" ConnectionString="<%$ ConnectionStrings:DB_9DE518_PermacultureConnectionString %>" SelectCommand="SELECT [Variety], [OrchardTypeID] FROM [tblOrchardItem]"></asp:SqlDataSource> 
</FooterTemplate> 
<ItemTemplate> 
<asp:Label ID="Label4" runat="server" Text='<%# Bind("OVariety") %>'></asp:Label> 
</ItemTemplate> 
</asp:TemplateField> 
<asp:TemplateField HeaderText="OAge" SortExpression="OAge"> 
<EditItemTemplate> 
<asp:TextBox ID="TextBox4" runat="server" Text='<%# Bind("OAge") %>'></asp:TextBox> 
</EditItemTemplate> 
<FooterTemplate> 
<asp:TextBox ID="txtBxAge" runat="server"></asp:TextBox> 
</FooterTemplate> 
<ItemTemplate> 
<asp:Label ID="Label5" runat="server" Text='<%# Bind("OAge") %>'></asp:Label> 
</ItemTemplate> 
</asp:TemplateField> 
<asp:TemplateField HeaderText="OYields" SortExpression="OYields"> 
<EditItemTemplate> 
<asp:TextBox ID="TextBox5" runat="server" Text='<%# Bind("OYields") %>'></asp:TextBox> 
</EditItemTemplate> 
<FooterTemplate> 
<asp:TextBox ID="txtBxYields" runat="server"></asp:TextBox> 
</FooterTemplate> 
<ItemTemplate> 
<asp:Label ID="Label6" runat="server" Text='<%# Bind("OYields") %>'></asp:Label> 
</ItemTemplate> 
</asp:TemplateField> 
<asp:TemplateField HeaderText="OPlantDate" SortExpression="OPlantDate"> 
<EditItemTemplate> 
<asp:TextBox ID="TextBox6" runat="server" Text='<%# Bind("OPlantDate") %>'></asp:TextBox> 
</EditItemTemplate> 
<FooterTemplate> 
<asp:TextBox ID="txtBxPlantDate" runat="server"></asp:TextBox> 
</FooterTemplate> 
<ItemTemplate> 
<asp:Label ID="Label7" runat="server" Text='<%# Bind("OPlantDate") %>'></asp:Label> 
</ItemTemplate> 
</asp:TemplateField> 
<asp:TemplateField HeaderText="OPlantFrom" SortExpression="OPlantFrom"> 
<EditItemTemplate> 
<asp:TextBox ID="TextBox7" runat="server" Text='<%# Bind("OPlantFrom") %>'></asp:TextBox> 
</EditItemTemplate> 
<FooterTemplate> 
<asp:TextBox ID="txtBxPlantFrom" runat="server"></asp:TextBox> 
</FooterTemplate> 
<ItemTemplate> 
<asp:Label ID="Label8" runat="server" Text='<%# Bind("OPlantFrom") %>'></asp:Label> 
</ItemTemplate> 
</asp:TemplateField> 
<asp:TemplateField HeaderText="OTreeSpacing" SortExpression="OTreeSpacing"> 
<EditItemTemplate> 
<asp:TextBox ID="TextBox1" runat="server" Text='<%# Bind("OTreeSpacing") %>'></asp:TextBox> 
</EditItemTemplate> 
<FooterTemplate> 
<asp:Label ID="lblTreeSpacing" runat="server"></asp:Label> 
</FooterTemplate> 
<ItemTemplate> 
<asp:Label ID="Label9" runat="server" Text='<%# Bind("OTreeSpacing") %>'></asp:Label> 
</ItemTemplate> 
</asp:TemplateField> 
<asp:TemplateField HeaderText="OFertilizingTimes" SortExpression="OFertilizingTimes"> 
<EditItemTemplate> 
<asp:TextBox ID="TextBox2" runat="server" Text='<%# Bind("OFertilizingTimes") %>'></asp:TextBox> 
</EditItemTemplate> 
<FooterTemplate> 
<asp:Label ID="lblFertilizingTimes" runat="server"></asp:Label> 
</FooterTemplate> 
<ItemTemplate> 
<asp:Label ID="Label10" runat="server" Text='<%# Bind("OFertilizingTimes") %>'></asp:Label> 
</ItemTemplate> 
</asp:TemplateField> 
<asp:TemplateField HeaderText="OWateringNeeds" SortExpression="OWateringNeeds"> 
<EditItemTemplate> 
<asp:TextBox ID="TextBox3" runat="server" Text='<%# Bind("OWateringNeeds") %>'></asp:TextBox> 
</EditItemTemplate> 
<FooterTemplate> 
<asp:Label ID="lblWateringNeeds" runat="server"></asp:Label> 
</FooterTemplate> 
<ItemTemplate> 
<asp:Label ID="Label11" runat="server" Text='<%# Bind("OWateringNeeds") %>'></asp:Label> 
</ItemTemplate> 
</asp:TemplateField> 
<asp:TemplateField HeaderText="OPollination" SortExpression="OPollination"> 
<EditItemTemplate> 
<asp:TextBox ID="TextBox8" runat="server" Text='<%# Bind("OPollination") %>'></asp:TextBox> 
</EditItemTemplate> 
<FooterTemplate> 
<asp:Label ID="lblPollination" runat="server"></asp:Label> 
</FooterTemplate> 
<ItemTemplate> 
<asp:Label ID="Label12" runat="server" Text='<%# Bind("OPollination") %>'></asp:Label> 
</ItemTemplate> 
</asp:TemplateField> 
<asp:TemplateField HeaderText="OFertilizer" SortExpression="OFertilizer"> 
<EditItemTemplate> 
<asp:TextBox ID="TextBox9" runat="server" Text='<%# Bind("OFertilizer") %>'></asp:TextBox> 
</EditItemTemplate> 
<FooterTemplate> 
<asp:Label ID="lblFertilizer" runat="server"></asp:Label> 
</FooterTemplate> 
<ItemTemplate> 
<asp:Label ID="Label13" runat="server" Text='<%# Bind("OFertilizer") %>'></asp:Label> 
</ItemTemplate> 
</asp:TemplateField> 
<asp:TemplateField HeaderText="OPesticide" SortExpression="OPesticide"> 
<EditItemTemplate> 
<asp:TextBox ID="TextBox10" runat="server" Text='<%# Bind("OPesticide") %>'></asp:TextBox> 
</EditItemTemplate> 
<FooterTemplate> 
<asp:Label ID="lblPesticide" runat="server"></asp:Label> 
</FooterTemplate> 
<ItemTemplate> 
<asp:Label ID="Label14" runat="server" Text='<%# Bind("OPesticide") %>'></asp:Label> 
</ItemTemplate> 
</asp:TemplateField> 
</Columns> 
<EditRowStyle BackColor="#7C6F57" /> 
<FooterStyle BackColor="#1C5E55" Font-Bold="True" ForeColor="Black" /> 
<HeaderStyle BackColor="#1C5E55" Font-Bold="True" ForeColor="White" /> 
<PagerStyle BackColor="#666666" ForeColor="White" HorizontalAlign="Center" /> 
<RowStyle BackColor="#E3EAEB" /> 
<SelectedRowStyle BackColor="#C5BBAF" Font-Bold="True" ForeColor="#333333" /> 
<SortedAscendingCellStyle BackColor="#F8FAFA" /> 
<SortedAscendingHeaderStyle BackColor="#246B61" /> 
<SortedDescendingCellStyle BackColor="#D4DFE1" /> 
<SortedDescendingHeaderStyle BackColor="#15524A" /> 
</asp:GridView> 
<asp:SqlDataSource ID="dsOrchardDatabase" runat="server" 
ConnectionString="<%$ ConnectionStrings:DB_9DE518_PermacultureConnectionString %>" 
SelectCommand="SELECT * FROM [tblUserOrchard]" DeleteCommand="DELETE FROM [tblUserOrchard] WHERE [OUserOrchardID] = @OUserOrchardID" InsertCommand="INSERT INTO [tblUserOrchard] ([OTypeName], [OSpecies], [OVariety], [OAge], [OYields], [OPlantDate], [OPlantFrom], [OTreeSpacing], [OFertilizingTimes], [OPruningTimes], [OWateringNeeds], [OPollination], [OFertilizer], [OPesticide]) VALUES (@OTypeName, @OSpecies, @OVariety, @OAge, @OYields, @OPlantDate, @OPlantFrom, @OTreeSpacing, @OFertilizingTimes, @OPruningTimes, @OWateringNeeds, @OPollination, @OFertilizer, @OPesticide)" UpdateCommand="UPDATE [tblUserOrchard] SET [OTypeName] = @OTypeName, [OSpecies] = @OSpecies, [OVariety] = @OVariety, [OAge] = @OAge, [OYields] = @OYields, [OPlantDate] = @OPlantDate, [OPlantFrom] = @OPlantFrom, [OTreeSpacing] = @OTreeSpacing, [OFertilizingTimes] = @OFertilizingTimes, [OPruningTimes] = @OPruningTimes, [OWateringNeeds] = @OWateringNeeds, [OPollination] = @OPollination, [OFertilizer] = @OFertilizer, [OPesticide] = @OPesticide WHERE [OUserOrchardID] = @OUserOrchardID"> 
<DeleteParameters> 
<asp:Parameter Name="OUserOrchardID" Type="Int32" /> 
</DeleteParameters> 
<InsertParameters> 
<asp:Parameter Name="OTypeName" Type="String" /> 
<asp:Parameter Name="OSpecies" Type="String" /> 
<asp:Parameter Name="OVariety" Type="String" /> 
<asp:Parameter Name="OAge" Type="Int32" /> 
<asp:Parameter Name="OYields" Type="String" /> 
<asp:Parameter Name="OPlantDate" Type="String" /> 
<asp:Parameter Name="OPlantFrom" Type="String" /> 
<asp:Parameter Name="OTreeSpacing" Type="String" /> 
<asp:Parameter Name="OFertilizingTimes" Type="String" /> 
<asp:Parameter Name="OPruningTimes" Type="String" /> 
<asp:Parameter Name="OWateringNeeds" Type="String" /> 
<asp:Parameter Name="OPollination" Type="String" /> 
<asp:Parameter Name="OFertilizer" Type="String" /> 
<asp:Parameter Name="OPesticide" Type="String" /> 
</InsertParameters> 
<UpdateParameters> 
<asp:Parameter Name="OTypeName" Type="String" /> 
<asp:Parameter Name="OSpecies" Type="String" /> 
<asp:Parameter Name="OVariety" Type="String" /> 
<asp:Parameter Name="OAge" Type="Int32" /> 
<asp:Parameter Name="OYields" Type="String" /> 
<asp:Parameter Name="OPlantDate" Type="String" /> 
<asp:Parameter Name="OPlantFrom" Type="String" /> 
<asp:Parameter Name="OTreeSpacing" Type="String" /> 
<asp:Parameter Name="OFertilizingTimes" Type="String" /> 
<asp:Parameter Name="OPruningTimes" Type="String" /> 
<asp:Parameter Name="OWateringNeeds" Type="String" /> 
<asp:Parameter Name="OPollination" Type="String" /> 
<asp:Parameter Name="OFertilizer" Type="String" /> 
<asp:Parameter Name="OPesticide" Type="String" /> 
<asp:Parameter Name="OUserOrchardID" Type="Int32" /> 
</UpdateParameters> 
</asp:SqlDataSource> 
<asp:SqlDataSource ID="dsTypeName" runat="server" ConnectionString="<%$ ConnectionStrings:DB_9DE518_PermacultureConnectionString %>" SelectCommand="SELECT * FROM [tblOrchardType]"></asp:SqlDataSource> 
</asp:Content> 

Я не уверен, что поместить в файл aspx.cs, но вот то, что я до сих пор относительно кнопки Insert:

public void lbInsert_Click(object sender, EventArgs e) 
{ 
dsOrchardDatabase.InsertParameters["OTypeName"].DefaultValue = 
((DropDownList)gvOrchardData.FooterRow.FindControl("ddlTypeName")).SelectedItem.ToString(); 
dsOrchardDatabase.InsertParameters["OSpecies"].DefaultValue = 
((DropDownList)gvOrchardData.FooterRow.FindControl("ddlSpecies")).SelectedItem.ToString(); 
dsOrchardDatabase.InsertParameters["OVariety"].DefaultValue = 
((DropDownList)gvOrchardData.FooterRow.FindControl("ddlVariety")).SelectedItem.ToString(); 
dsOrchardDatabase.InsertParameters["OAge"].DefaultValue = 
((TextBox)gvOrchardData.FooterRow.FindControl("txtBxAge")).Text; 
dsOrchardDatabase.InsertParameters["OYields"].DefaultValue = 
((TextBox)gvOrchardData.FooterRow.FindControl("txtBxYields")).Text; 
dsOrchardDatabase.InsertParameters["OPlantDate"].DefaultValue = 
((TextBox)gvOrchardData.FooterRow.FindControl("txtBxPlantDate")).Text; 
dsOrchardDatabase.InsertParameters["OPlantFrom"].DefaultValue = 
((TextBox)gvOrchardData.FooterRow.FindControl("txtBxPlantFrom")).Text; 
dsOrchardDatabase.InsertParameters["OTreeSpacing"].DefaultValue = 
((Label)gvOrchardData.FooterRow.FindControl("lblTreeSpacing")).Text; 
dsOrchardDatabase.InsertParameters["OFertilizingTimes"].DefaultValue = 
((Label)gvOrchardData.FooterRow.FindControl("lblFertilizingTimes")).Text; 
dsOrchardDatabase.InsertParameters["OWateringNeeds"].DefaultValue = 
((Label)gvOrchardData.FooterRow.FindControl("lblWateringNeeds")).Text; 
dsOrchardDatabase.InsertParameters["OPollination"].DefaultValue = 
((Label)gvOrchardData.FooterRow.FindControl("lblPollination")).Text; 
dsOrchardDatabase.InsertParameters["OFertilizer"].DefaultValue = 
((Label)gvOrchardData.FooterRow.FindControl("lblFertilizer")).Text; 
dsOrchardDatabase.InsertParameters["OPesticide"].DefaultValue = 
((Label)gvOrchardData.FooterRow.FindControl("lblPesticide")).Text; 
dsOrchardDatabase.Insert(); 
} 

Любая помощь была бы высоко оценена!

Example of Orchard Gridview

Answer 1

Просто чтобы дать вам идею, вы должны справиться с этим на код-за (я заметил, что свойство AutoPostBack устанавливается истина) ..

Скажем, на событие изменения значения ddl1 или аналогичные:

var ddl1Value = ddl1.SelectedValue; 
ddl2.ItemSource = ddl2DS.Where(item => item.Field1 = ddl1Value); 
ddl3.ItemSource = ddl3DS.Where(item => item.Field1 = ddl1Value); 

в основном вы будете просто фильтровать источник элемента другого выпадающего списка в качестве значения первого ниспадающего изменений.

Если вы хотите, вы также можете использовать javascript для выполнения этой же самой концепции, чтобы избежать обратных передач.

дать человеку рыбу, и ты накормишь его на один день; научить человека ловить рыбу, и ты накормишь его на всю жизнь

Answer 2

Вот решение, которое я нашел, чтобы работать:

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Web; 
using System.Web.UI; 
using System.Web.UI.WebControls; 
using System.Data; 
using System.Data.SqlClient; 
using System.Configuration; 
using System.Web.Configuration; 

namespace PermacultureOrganizer 
{ 
    public partial class OrchardMainWebForm : System.Web.UI.Page 
    { 
     //Make the SQL connections 
     SqlConnection con2 = new SqlConnection(@"Data Source=SQL5018.SmarterASP.net;Initial Catalog=DB_9DE518_Permaculture;Persist Security Info=True;User ID=DB_9DE518_Permaculture_admin;Password=*****"); 
     public string con = WebConfigurationManager.ConnectionStrings["PermaCultureConnection"].ConnectionString; 

    public void Page_Load(object sender, EventArgs e) 
    { 
     if (!IsPostBack) 
     { 
      //Create EventHandlers 
      LinkButton btnInsert = new LinkButton(); 
      btnInsert.Click += new EventHandler(btnInsert_Click); 

      DropDownList ddlTypeName = new DropDownList(); 
      ddlTypeName.SelectedIndexChanged += new EventHandler(ddlTypeName_SelectedIndexChanged); 

      DropDownList ddlSpecies = new DropDownList(); 
      ddlSpecies.SelectedIndexChanged += new EventHandler(ddlSpecies_SelectedIndexChanged); 

      DropDownList ddlVariety = new DropDownList(); 
      ddlVariety.SelectedIndexChanged += new EventHandler(ddlVariety_SelectedIndexChanged); 
     } 
    } 

    protected void btnViewData_Click(object sender, EventArgs e) 
    { 
     //Go to OrchardViewer Page 
     Response.Redirect("OrchardViewer.aspx"); 
    } 

    protected void btnSearchData_Click(object sender, EventArgs e) 
    { 
     //Go to OrchardSearch Page 
     Response.Redirect("OrchardSearch.aspx"); 
    } 

    protected void ddlTypeName_SelectedIndexChanged(object sender, EventArgs e) 
    { 
     //Populate ddlSpecies based on TypeName selection 
     ddlSpecies.DataSource = RetrieveSpecies(ddlTypeName.SelectedValue); 
     ddlSpecies.DataBind(); 
     ddlSpecies.Items.Insert(0, "Select Species"); 
    } 

    private DataTable RetrieveSpecies(string OrchardTypeID) 
    { 
     //Use OrchardTypeID from TypeName selection to filter Species 
     string connString = ConfigurationManager.ConnectionStrings["PermaCultureConnection"].ConnectionString; 
     string sql = @"SELECT OrchardItemID, OSpecies FROM tblOrchardItem WHERE OrchardTypeID = " + OrchardTypeID; 
     DataTable dtSpecies = new DataTable(); 

     using (SqlConnection conn = new SqlConnection(connString)) 
     { 
      conn.Open(); 
      //Initialize command object 
      using (SqlCommand cmd = new SqlCommand(sql, conn)) 
      { 
       SqlDataAdapter adapter = new SqlDataAdapter(cmd); 
       //Fill the result set 
       adapter.Fill(dtSpecies); 
      } 
     } 
     return dtSpecies; 
    } 

    protected void ddlSpecies_SelectedIndexChanged(object sender, EventArgs e) 
    { 
     //Populate ddlVariety based on Species selection 
     ddlVariety.DataSource = RetrieveVariety(ddlSpecies.SelectedValue); 
     ddlVariety.DataBind(); 
     ddlVariety.Items.Insert(0, "Select Variety"); 
    } 

    private DataTable RetrieveVariety(string OrchardItemID) 
    { 
     //Use OrchardTypeID from Species selection to filter Variety 
     string connString = ConfigurationManager.ConnectionStrings["PermaCultureConnection"].ConnectionString; 
     string sql = @"SELECT OrchardItemID, OVariety FROM tblOrchardItem WHERE OrchardItemID = " + OrchardItemID; 
     DataTable dtVariety = new DataTable(); 

     using (SqlConnection conn = new SqlConnection(connString)) 
     { 
      conn.Open(); 
      //Initialize command object 
      using (SqlCommand cmd = new SqlCommand(sql, conn)) 
      { 
       SqlDataAdapter adapter = new SqlDataAdapter(cmd); 
       //Fill the result set 
       adapter.Fill(dtVariety); 
      } 
     } 
     return dtVariety; 
    } 

    protected void ddlVariety_SelectedIndexChanged(object sender, EventArgs e) 
    { 
     //Gather additional data based on Variety selection 
     int OrchardItemID = Convert.ToInt32(ddlVariety.SelectedIndex); 
     BindOrchardGrid(OrchardItemID); 

     //Display picture next based on Variety selection 
     string Variety = ddlVariety.SelectedItem.ToString(); 
     switch (Variety) 
     { 
      case "Bladen": 
       imageTree.ImageUrl = "Images/blueberry-vine 300x200.jpg"; 
       break; 
      case "Bartlett": 
       imageTree.ImageUrl = "Images/Pear-Tree 300x200.jpg"; 
       break; 
      case "Babcook": 
       imageTree.ImageUrl = "Images/peach-tree-w-fruit 300x200.jpg"; 
       break; 
      case "Abbuoto": 
       imageTree.ImageUrl = "Images/grape-vine 300x200.jpg"; 
       break; 
      case "Carya": 
       imageTree.ImageUrl = "Images/pecans 300x200.jpg"; 
       break; 
     } 
    } 

    private void BindOrchardGrid(int OrchardItemID) 
    { 
     DataSet dtLabels; 
     SqlDataAdapter sda = new SqlDataAdapter(); 
     SqlCommand cmd = new SqlCommand("SELECT * FROM tblOrchardItem WHERE OrchardItemID = " + OrchardItemID, con2); 
     sda.SelectCommand = cmd; 
     dtLabels = new DataSet("OrchardItem"); 
     sda.Fill(dtLabels, "OrchardItem"); 

     foreach (DataRow row in dtLabels.Tables["OrchardItem"].Rows) 
     { 
      //Gather other pertinent data based on Variety selected 
      lblTreeSpacing.Text = Convert.ToString(row["OTreeSpacing"]); 
      lblFertilizingTimes.Text = Convert.ToString(row["OFertilizingTimes"]); 
      lblPruningTimes.Text = Convert.ToString(row["OPruningTimes"]); 
      lblWateringNeeds.Text = Convert.ToString(row["OWateringNeeds"]); 
      lblPollination.Text = Convert.ToString(row["OPollination"]); 

      int FertilizerID = Convert.ToInt32(row["FertilizerID"]); 
      int PesticideID = Convert.ToInt32(row["PesticideID"]); 

      DataSet dtFert; 
      SqlDataAdapter sdaF = new SqlDataAdapter(); 
      SqlCommand cmdF = new SqlCommand("SELECT * FROM tblFertilizer WHERE FertilizerID = " + FertilizerID, con2); 
      sdaF.SelectCommand = cmdF; 
      dtFert = new DataSet("Fert"); 
      sdaF.Fill(dtFert, "Fert"); 

      foreach (DataRow rowF in dtFert.Tables["Fert"].Rows) 
      { 
       lblFertilizer.Text = Convert.ToString(rowF["FertilizerName"]); 
      } 

      DataSet dtPest; 
      SqlDataAdapter sdaP = new SqlDataAdapter(); 
      SqlCommand cmdP = new SqlCommand("SELECT * FROM tblPesticide WHERE PesticideID = " + PesticideID, con2); 
      sdaP.SelectCommand = cmdP; 
      dtPest = new DataSet("Pest"); 
      sdaP.Fill(dtPest, "Pest"); 

      foreach (DataRow rowP in dtPest.Tables["Pest"].Rows) 
      { 
       lblPesticide.Text = Convert.ToString(rowP["PesticideName"]); 
      } 
     } 
    } 

    public void btnInsert_Click(object sender, EventArgs e) 
    { 
     //After the user inputs data, insert it into the database and then switch to OrchardViewer page 
     CreateOrchard(con); 
     Response.Redirect("OrchardViewer.aspx"); 
    } 

    public DataTable CreateOrchard(string con) 
    { 
     DataTable dtOrchard = new DataTable(); 
     using (SqlConnection Connection = new SqlConnection(con)) 
     { 
      SqlCommand sqlcmd = new SqlCommand(); 
      //associate command object with connection 
      sqlcmd.Connection = Connection; 
      sqlcmd.CommandType = CommandType.StoredProcedure; 
      sqlcmd.CommandText = "spInsertOrchardData"; 

      //Gather user input for insert into database 
      sqlcmd.Parameters.Add("@UserOrchardID", SqlDbType.VarChar, 1000).Value = ""; 
      sqlcmd.Parameters.Add("@TypeName", SqlDbType.VarChar, 1000).Value = Convert.ToString(ddlTypeName.SelectedItem); 
      sqlcmd.Parameters.Add("@Species", SqlDbType.VarChar, 1000).Value = Convert.ToString(ddlSpecies.SelectedItem); 
      sqlcmd.Parameters.Add("@Variety", SqlDbType.VarChar, 1000).Value = Convert.ToString(ddlVariety.SelectedItem); 
      sqlcmd.Parameters.Add("@Age", SqlDbType.Int, 1000).Value = Convert.ToInt32(txtBxAge.Text); 
      sqlcmd.Parameters.Add("@Yields", SqlDbType.VarChar, 1000).Value = Convert.ToInt32(txtBxYields.Text); 
      sqlcmd.Parameters.Add("@PlantDate", SqlDbType.VarChar, 1000).Value = Convert.ToString(txtBxPlantDate.Text); 
      sqlcmd.Parameters.Add("@PlantFrom", SqlDbType.VarChar, 1000).Value = Convert.ToString(txtBxPlantFrom.Text); 
      sqlcmd.Parameters.Add("@TreeSpacing", SqlDbType.VarChar, 1000).Value = Convert.ToString(lblTreeSpacing.Text); 
      sqlcmd.Parameters.Add("@FertilizingTimes", SqlDbType.VarChar, 1000).Value = Convert.ToString(lblFertilizingTimes.Text); 
      sqlcmd.Parameters.Add("@PruningTimes", SqlDbType.VarChar, 1000).Value = Convert.ToString(lblPruningTimes.Text); 
      sqlcmd.Parameters.Add("@WateringNeeds", SqlDbType.VarChar, 1000).Value = Convert.ToString(lblWateringNeeds.Text); 
      sqlcmd.Parameters.Add("@Pollination", SqlDbType.VarChar, 1000).Value = Convert.ToString(lblPollination.Text); 
      sqlcmd.Parameters.Add("@Fertilizer", SqlDbType.VarChar, 1000).Value = Convert.ToString(lblFertilizer.Text); 
      sqlcmd.Parameters.Add("@Pesticide", SqlDbType.VarChar, 1000).Value = Convert.ToString(lblPesticide.Text); 

      using (SqlDataAdapter sda = new SqlDataAdapter(sqlcmd)) 
      { 
       DataSet dataset = new DataSet(); 
       sda.Fill(dataset); 
      } 
     } 
     return dtOrchard; 
    } 
} 

}