wie man eine Dropdownliste basierend auf der Auswahl einer anderen Dropdownliste in einer Gridview auffüllt

Question

Ich habe eine Gridview mit einer eigenen sqlDataSource. In der Fußzeile habe ich ein Einfügen-Feld, um eine neue Zeile zu erstellen. Allerdings ist diese Fußzeile ziemlich komplex und ich versuche herauszufinden, wie man es funktioniert.

Was ich gerne sehen würde, ist, dass ein Benutzer die OTypeName ddl wählt. Basierend auf dieser Auswahl wird das OSpecies-ddl aktiviert und Werte basierend auf dem OTypeName-ddl aufgefüllt. Dasselbe kann in Bezug auf OSpecies und OVariety gesagt werden.

Der Benutzer gibt dann seine eigenen Informationen in OAge, OYields, OPlantDate und OPlantFrom ein.

Die übrigen Felder in der Fußzeile sind Beschriftungen, die basierend auf der letzten OVariety-Auswahl ausgefüllt werden.

Die Schaltfläche Einfügen fügt alle diese Spalten zur Gridview hinzu.

Ich brauche nur Hilfe beim Auffüllen eines ddl basierend auf der ddl-Auswahl eines anderen und wie man ein Label basierend auf einer ddl-Auswahl auffüllt.

Hier ist mein Code in der aspx-Datei:

<%@ 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> 

Ich bin nicht sicher, was in der aspx.cs Datei zu setzen, aber hier ist das, was ich bisher über die Schaltfläche Einfügen:

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(); 
} 

Jede Hilfe wäre sehr willkommen!

Example of Orchard Gridview

Answer 1

Nur um Ihnen eine Idee, sollten Sie diese auf Ihrem Code-Behind-Griff (Ich bemerkte, dass die Autopostback-Eigenschaft auf true gesetzt ist) ..

der auf DDL1 Wertänderung Ereignis Lassen Sie sagen, oder ähnlich:

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

Grundsätzlich werden Sie nur filtern, um den Artikel Quelle der anderen Drop-Down-Listen als der Wert der ersten Dropdown-Änderungen.

Wenn Sie möchten, können Sie auch Javascript verwenden, um genau dieses Konzept durchzuführen, um Postbacks zu vermeiden.

einem Mann einen Fisch geben und du ernährst ihn für einen Tag; lehren ein Mann zu fischen und Sie ihn ein Leben lang ernähren

Answer 2

Hier die Lösung ich zur Arbeit gefunden:

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; 
    } 
} 

}