I've currently run into an error with binding causing an error when the value pulled from the database is blank.
In an attempt to fix it I am instead binding the value from the database to a label, and then looping through the items in the combobox's databound event, matching the against the label. If it finds a match, it is supposed to set the selected value of the combobox to the text value of the label (lblSalesManagerValue).
<td align="left">
<asp:Label ID="lblSalesManager" runat="server" Text="Sales Manager:" Width="120px"></asp:Label>
<telerik:RadComboBox ID="cboSalesManager" runat="server" DataSourceID="SalesManagersDataSource" DataTextField="Name" DataValueField="No." Width="149px" OnDataBound="cboSalesManager_DataBound" />
<asp:Label ID="lblSalesManagerValue" runat="server" Text='<%# Bind("SM") %>' Visible="false"></asp:Label>
<asp:Label ID="lblTest" runat="server" Text="" Visible="True"></asp:Label>
<asp:RequiredFieldValidator id="RequiredFieldValidator4" runat="server"
ErrorMessage="Please select Sales Manager." Text=" *" ControlToValidate= "cboSalesManager"></asp:RequiredFieldValidator>
</td>
I am working in VB, using a Telerik RadGrid.
Protected Sub cboSalesManager_DataBound(sender As Object, e As EventArgs)
Dim cbo As RadComboBox = DirectCast(sender, RadComboBox)
Dim gr As GridEditFormItem = DirectCast(cbo.Parent.NamingContainer, GridEditFormItem)
For Each itm As RadComboBoxItem In cbo.Items
If itm.Value.ToString = CType(gr.FindControl("lblSalesManagerValue"), Label).Text Then
cbo.SelectedValue = CType(gr.FindControl("lblSalesManagerValue"), Label).Text
CType(gr.FindControl("lblTest"), Label).Text = CType(gr.FindControl("lblTest"), Label).Text & ";" & cbo.SelectedValue.ToString
End If
Next
End Sub
Everything fires, as I get a semicolon beside my combobox, but the value just won't set for some reason and I am baffled.
Edit: After playing with it some more, I have discovered that nothing from that label will stick. I tried setting the test label (I'd response.write but this is an asynchronous call) and it won't set either.
I figured it out. The combobox was binding before the label. I added a forced
CType(gr.FindControl("lblSalesManagerValue"), Label).DataBind()
And it works perfectly. =)
Related
I currently have a GridView with two buttons that I have added using the following code;
<asp:GridView ID="gvResults" AutoGenerateColumns="False" runat="server" Font-Size="small"
DataKeyNames="BeachHutID" OnRowDataBound="gvResults_RowDataBound" CssClass="BBCSearch">
<Columns>
<asp:BoundField DataField="BeachHutID" SortExpression="BeachHutID" Visible="false">
</asp:BoundField>
<asp:ImageField DataImageUrlField="HutImage" ItemStyle-Width="1%" ReadOnly="true" />
<asp:BoundField HeaderText="Facilities" DataField="Facilities" Visible="false"></asp:BoundField>
<asp:BoundField HeaderText="Info" DataField="Info" Visible="false"></asp:BoundField>
<asp:TemplateField>
<ItemTemplate>
<asp:PlaceHolder ID="lblHolder" runat="server"></asp:PlaceHolder>
<br />
<asp:PlaceHolder ID="imgHolder" runat="server"></asp:PlaceHolder>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField>
<ItemTemplate>
<asp:Button ID="btnHire" CommandArgument='<%# Eval("BeachHutID") %>' runat="server"
Text="Hire Beach Hut" OnClick="Hire_Click" />
<asp:Button ID="ButtonLogin" CommandArgument='<%# Eval("BeachHutID") %>' runat="server"
Text="Login to Hire Beach Hut" OnClick="Login_Redirect" />
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
What I want to happen is if the user is logged in, the btnHire button should be enabled and showing and if they're not logged in, ButtonLoggedIn is showing and btnHire is hidden. This is the code I have at the moment;
Public Sub PopulateGrid()
Dim AvailableHuts As New DataTable
AvailableHuts = GetData()
gvResults.DataSource = AvailableHuts
gvResults.DataBind()
gvResults.Enabled = True
'If statement controlling the enabling and disabling of the Beach Hut booking button
If Session("LoginID") = "" Then
For Each rowItem As GridViewRow In gvResults.Rows
rowItem.Cells(5).Enabled = True
Next
End If
lblCaption.Text = "Your search returned " + CStr(AvailableHuts.Rows.Count) + " results"
End Sub
At the moment both buttons are enabled at all times and I'm not sure what I need to add/changed to get the desired result.
From the answer posted by #Andrei, I have added the following to to this Sub;
Protected Sub gvResults_RowDataBound(ByVal sender As Object, ByVal e As GridViewRowEventArgs) Handles gvResults.RowDataBound
Dim URL(), Text() As String
Dim img As Image
Dim lbl As Label
Dim FacilitiesImg As PlaceHolder = e.Row.FindControl("imgHolder")
Dim Infolbl As PlaceHolder = e.Row.FindControl("lblHolder")
'Added Code from answer
Dim hireBtn As Button = CType(e.Row.FindControl("btnHire"), Button)
hireBtn.Visible = Not String.IsNullOrEmpty(Session("LoginID"))
'Added Code from answer
Dim LoginBtn As Button = CType(e.Row.FindControl("ButtonLogin"), Button)
LoginBtn.Visible = String.IsNullOrEmpty(Session("LoginID"))
If e.Row.RowType = DataControlRowType.DataRow Then
URL = e.Row.DataItem(3).Split(",")
Text = e.Row.DataItem(2).Split(",")
'Add the Facilities Images to the grid Row
For Each item In URL
If item.ToString <> "" Then
img = New Image
img.ImageUrl = item.ToString
FacilitiesImg.Controls.Add(img)
End If
Next
'Add the information to the grid row
'convert # into a carriage return and * into £
For Each item In Text
If item.ToString <> "" Then
lbl = New Label
lbl.Text = Replace(Replace(item.ToString, "#", "<br />"), "*", "£")
Infolbl.Controls.Add(lbl)
End If
Next
End If
End Sub
However I'm receiving the following error when trying to run the program;
Cannot refer to an instance member of a class from within a shared method or shared member initializer without an explicit instance of the class
Any assistance would be much appreciated.
Thanks
Not sure how is your authentication implemented, but let's assume you use HttpContext.Current.Request.IsAuthenticated. Then you can just manipulate Visible property of the buttons in code behind:
btnHire.Visible = HttpContext.Current.Request.IsAuthenticated
ButtonLoggedIn.Visible = Not HttpContext.Current.Request.IsAuthenticated
Update.
Sorry, somehow missed from the post the fact that you seems to be using Session("LoginID") to decide if the use is logged in. The you can do this:
btnHire.Visible = Not String.IsNullOrEmpty(Session("LoginID"))
ButtonLoggedIn.Visible = String.IsNullOrEmpty(Session("LoginID"))
Update 2.
As it turns out, buttons are a part of GridView row. As they are inside the template, you cannot really reach them in the code behind. So you can take two options.
First, you can subscribe to RowDataBound event (which you already did), and inside it do FindControl in the current row to find the necessary button:
Sub gvResults_RowDataBound(ByVal sender As Object, ByVal e As GridViewRowEventArgs)
...
Button hireBtn = CType(e.Row.FindControl("btnHire"), Button);
hireBtn.Visible = Not String.IsNullOrEmpty(Session("LoginID"))
and likewise for the second button.
Second, you can try doing it in the markup:
<asp:Button ID="btnHire" CommandArgument='<%# Eval("BeachHutID") %>'
runat="server" Text="Hire Beach Hut" OnClick="Hire_Click"
Visible=<%# String.IsNullOrEmpty(Session("LoginID")) %> />
try
<asp:Button ID="btnHire" CommandArgument='<%# Eval("BeachHutID") %>' runat="server" Visible='<%# islogin()?true:false %>' Text="Hire Beach Hut" OnClick="Hire_Click" />
<asp:Button ID="ButtonLoggedIn" CommandArgument='<%# Eval("BeachHutID") %>' runat="server" Visible='<%# islogin()?false:true %>' Text="Login to Hire Beach Hut" OnClick="Login_Redirect" />
paste this code to aspx.cs page:
Public Shared Function isLogin() As Boolean
Dim stat As Boolean = False
Try
If Session("LoginID") IsNot Nothing AndAlso Session("LoginID") <> "" Then
stat = True
End If
Catch e1 As Exception
stat = False
End Try
Return stat
End Function
Edit2:
Visible='<%# islogin()?false:true %> this means if isLogin() return true then Visible property set to false else it's visible property set to true.
I'm having issue with a dropdownlist updating a textbox, both held within a listview, within an update panel which in turn is in an item template.
Updated
I have got this working with the same code without the above containers in a different web page on the same project, however having trouble linking it with the lisview and other containers.
I am unsure of where the problem lies, the onClick isn't firing unless there's a call back to the server, regardless whether the drop down is contained within the containers mentioned above.
Any help would be greatly appreciated, thanks in advance.
Using asp (1st) and VB code behind (2nd).
<InsertItemTemplate>
<asp:panel runat="server" ChildrenAsTriggers="true" UpdateMode="Always">
<asp:ListView ID="ListView1" runat="server" InsertItemPosition="FirstItem" IAllowPaging="True" EnableViewState="true">
<tr>
<td>
<asp:TextBox ID="TextBox2" runat="server" Text='<%# Bind("Details")%>' TextMode="MultiLine" />
</td>
<td>
<asp:DropDownList ID="DLL" runat="server" OnSelectedIndexChanged="DLL_SelectedIndexChanged" AutoPostBack="true "EnableViewState="true">
<asp:ListItem>Select</asp:ListItem>
<asp:ListItem Value="1">Yes</asp:ListItem>
<asp:ListItem Value="2">No</asp:ListItem>
<asp:ListItem Value="3">Maybe</asp:ListItem>
<asp:ListItem Value="4">I dont know</asp:ListItem>
<asp:ListItem Value="5">Can you repeat</asp:ListItem>
<asp:ListItem Value="6">the question</asp:ListItem>
</asp:DropDownList>
</td>
</tr>
</asp:panel>
</InsertItemTemplate>
Code behind
Protected Sub DDL_SelectedIndexChanged(sender As Object, e As EventArgs)
Dim ddl As DropDownList = DirectCast(sender, DropDownList)
Dim listviewItemThing = DirectCast(sender.parent.NamingContainer, ListViewItem)
Dim tb As TextBox = DirectCast(ddl.NamingContainer.FindControl("TextBox2"), TextBox)
If ddl.SelectedValue = 1 Then
tb.Text = My.Computer.FileSystem.ReadAllText("E:\Users\han\Documents\Templates\1.txt")
ElseIf ddl.SelectedValue = 2 Then
tb.Text = My.Computer.FileSystem.ReadAllText("E:\Users\han\Documents\Templates\2.txt")
ElseIf ddl.SelectedValue = 3 Then
tb.Text = My.Computer.FileSystem.ReadAllText("E:\Users\han\Documents\Templates\3.txt")
ElseIf ddl.SelectedValue = 4 Then
tb.Text = My.Computer.FileSystem.ReadAllText("E:\Users\han\Documents\Templates\4.txt")
ElseIf ddl.SelectedValue = 5 Then
tb.Text = My.Computer.FileSystem.ReadAllText("E:\Users\han\Documents\Templates\5.txt")
ElseIf ddl.SelectedValue = 6 Then
tb.Text = My.Computer.FileSystem.ReadAllText("E:\Users\han\Documents\Templates\6.txt")
Else
tb.Text = ""
End If
End Sub
Update 2
As per request please see attached screen shot of browser console error in debug on VS2013
And expanded error.
Update 3
Added JQuery to try to force PostBack.
function JsFunction() {
__doPostBack('DLL_SelectedIndexChanged', '');
}
ASP link to JQ
<asp:DropDownList ID="DDL" runat="server" Width="120px" OnSelectedIndexChanged="DDL_SelectedIndexChanged" AutoPostBack="true" CausesValidation="false" EnableViewState="true" onchange="javascript:JsFunction()">
You have correct code for your drop down list, so error in other place.
As you see in error message: when you try submit form problem with HtmlEditorExtender.
So just remove or disable it for quick fixing problem.
As for error with HtmlEditorExtender we need a little bit information, of course, if you still need solve it.
Assuming these controls are within the ItemTemplate of your ListView:
FindControl("DDL") won't work, because it's trying to find the control within the page;
ListView1.FindControl("TextBox2") won't work, because there will be multiple instances of TextBox2 within the ListView.
Try this instead:
Dim ddl As DropDownList = DirectCast(sender, DropDownList)
Dim tb As TextBox = DirectCast(ddl.NamingContainer.FindControl("TextBox2"), TextBox)
I assume you haven't got the typo in your actual code:
OnSelectedIndexChanged="DLL_SelectedIndexChanged"
Where the event handler is DDL_SelectedIndexChanged.
Have you put a breakpoint on to check whether the event handler is not being called or if it is bailing out at some point after it fails to do the cast you want it to do?
So, I'm having a slight problem with my code.
I was working on a small school project (recreation of book library) and encountered a problem which I cannot get a grasp of.
So, the user can search for a list of books, and after the list is populated (via DataList control), a small button "Book now" (Reserve) appears which user can click and reserve his book.
This is the code for the DataList control that resides in "Search.aspx"
<asp:DataList ID="DataList1" runat="server" DataKeyField="knjigaId" DataSourceID="SearchSqlDataSource" CssClass="searchControl">
<ItemTemplate>
<div class="pictureOfFoundBook">
<asp:Image ID="pictureOfFoundBook_imageLink" runat="server" ImageUrl='<%#"~/GetImage.aspx?knjigaId=" & Eval("knjigaId") & "&img=naslovnica" %>' />
</div>
<div class="descriptionOfFoundBook">
Naziv: <asp:Label ID="Label1" runat="server" Text='<%# Eval("naziv") %>' /><br />
Godina izdanja: <asp:Label ID="Label2" runat="server" Text='<%# Eval("godinaIzdanja") %>' /><br />
Broj stranica : <asp:Label ID="brojStranicaLabel" runat="server" Text='<%# Eval("brojStranica") %>' /><br />
Izdavač: <asp:Label ID="NazivIzdavacaLabel" runat="server" Text='<%# Eval("NazivIzdavaca") %>' /><br />
Vrsta tiskovine : <asp:Label ID="NazivVrsteTiskovineLabel" runat="server" Text='<%# Eval("NazivVrsteTiskovine") %>' /><br />
Kategorija: <asp:Label ID="NazivKategorijeLabel" runat="server" Text='<%# Eval("NazivKategorije") %>' /><br /><br />
<asp:HyperLink ID="foundBookEditHL_adminOnly" runat="server" NavigateUrl='<%# "~/admin/knjigeEdit.aspx?knjigaId=" & Eval("knjigaId") %>'>Uredi knjigu</asp:HyperLink><br />
<asp:Button ID="rezervacijeButton" runat="server" Text="Rezerviraj" OnClick="rezervacijaClick" CommandArgument='<%# Eval("knjigaId") %>'/><br />
<asp:Label ID="rezStatusLabel" runat="server"></asp:Label>
<asp:PlaceHolder ID="rezStatusPlaceholder" runat="server"></asp:PlaceHolder>
</div>
<hr />
</ItemTemplate>
</asp:DataList>
I've set the DataList1 control as a Friend sub so I can access the controls in it from another sub;
Friend Sub DataList1_ItemCreated(sender As Object, e As System.Web.UI.WebControls.DataListItemEventArgs) Handles DataList1.ItemCreated
End Sub
I was trying to do the following; on the click of a button "rezervacijeButton", a function "rezervacijaClick" runs, which populates the table in the database.
Protected Sub rezervacijaClick(sender As Object, e As System.EventArgs)
Dim Conn As New System.Data.SqlClient.SqlConnection(ConfigurationManager.ConnectionStrings("LocalSqlServer").ToString)
Dim cmd As New System.Data.SqlClient.SqlCommand
Dim sql As New StringBuilder
Dim rezstatus As Label = DataList1.FindControl("rezStatusLabel")
sql.Append("INSERT INTO rezervacije(UserName, knjigaId) VALUES (#UserName, #knjigaId)")
Dim buttonsender As Button = sender
cmd.Parameters.AddWithValue("UserName", User.Identity.Name)
cmd.Parameters.AddWithValue("knjigaId", buttonsender.CommandArgument)
Conn.Open()
cmd.CommandText = sql.ToString
cmd.Connection = Conn
cmd.ExecuteNonQuery()
Conn.Close()
buttonsender.Visible = False
rezstatus.Text = "aaa"
'Try
' rezstatus.Text = "testing..."
'Catch ex As Exception
' exlabel.Text = "POGREŠKA"
' exlabel.ForeColor = Drawing.Color.Red
'End
End Sub
The next thing I wanted to do in the function "rezervacijaClick" was to set the text value of the Label (with ID "rezStatusLabel", which resides inside the DataList1 control) to "SOME TEXT" after the "Reserve" button is clicked.
But after the button click, I get the following error :
Object reference not set to an instance of an object.
Line 21:
Line 22: buttonsender.Visible = False
Line 23: rezstatus.Text = "aaa"
Line 24:
Line 25: 'Try
Your rezstatus object is Nothing (null).
This is happening because you aren't looking in the right place for your label.
Each record of data you bind to the DataList will create a new hierarchy of controls, containers that hold the other controls you have defined in your ItemTemplate.
The immediate descendants of DataList1 will be a collection of DataListItem objects and then you will have your controls inside those.
Since we don't know for sure (unless you know you are only binding one record to the DataList) which DataListItem the desired label will be in, we simply walk backwards up the control tree and find the label from there.
Because you are responding to a button click event in your rezervacijaClick method, the parameter sender will be of type Button and will come from rezervacijeButton, so we can use that information to find your label:
Dim clickedButton As Button = CType(sender, Button) 'convert the sender parameter to the correct type: Button
Dim buttonParent As Control = clickedButton.Parent 'get a reference to the button's parent control
Dim rezstatus As Label = CType(buttonParent.FindControl(""), Label) 'find the label by ID and convert it to a Label as the return type of FindControl is Control
I would recommend that, instead of using the Button click event, you use the DataList.ItemCommand event. It will make your life a lot easier. This event fires whenever a Button is clicked within a row of your DataList control.
This way, you get the index passed in through the DataListCommandEventArgs parameter. then you would just need to update your DataList markup to add the event handler:
<asp:DataList ID="DataList1" runat="server" DataKeyField="knjigaId"
DataSourceID="SearchSqlDataSource" CssClass="searchControl"
ItemCommand="DataList1_ItemCommand" >
And your handler code would look like this:
Protected Sub DataList1_ItemCommand(sender As Object, e As System.EventArgs)
Dim Conn As New System.Data.SqlClient.SqlConnection(ConfigurationManager.ConnectionStrings("LocalSqlServer").ToString)
Dim cmd As New System.Data.SqlClient.SqlCommand
Dim sql As New StringBuilder
Dim rezstatus As Label = e.Item.FindControl("rezStatusLabel")
sql.Append("INSERT INTO rezervacije(UserName, knjigaId) VALUES (#UserName, #knjigaId)")
Dim buttonsender As Button = e.Item.FindControl("rezervacijeButton")
cmd.Parameters.AddWithValue("UserName", User.Identity.Name)
cmd.Parameters.AddWithValue("knjigaId", buttonsender.CommandArgument)
Conn.Open()
cmd.CommandText = sql.ToString
cmd.Connection = Conn
cmd.ExecuteNonQuery()
Conn.Close()
buttonsender.Visible = False
rezstatus.Text = "aaa"
End Sub
I need an advice how to correct my code. I am using FindControl method to find TextBox inside Repeater. This is my markup:
<asp:Repeater ID="Repeater1">
HERE ARE SOME OTHER DATA
<ItemTemplate>
<asp:FormView ID="FormViewAddComment" runat="server"
DataSourceID="SqlDataSourceInsertComments" DefaultMode="Insert"
OnItemInserted="FormViewAddComment_ItemInserted"
OnItemInserting="FormViewAddComment_ItemInserting">
<InsertItemTemplate>
<asp:TextBox ID="txtAddComment" runat="server" CssClass="textbox"
Text='<%# Bind("CommentText") %>' Width="200px" />
<asp:Button ID="btnAddComment" runat="server" CssClass="button"
Text="Comment" CommandName="Insert" CausesValidation="false"/>
</InsertItemTemplate>
</asp:FormView>
</ItemTemplate>
</asp:Repeater>
And this is my code behind:
Protected Sub FormViewAddComment_ItemInserting(sender As Object, e As FormViewInsertEventArgs)
Dim FormView As FormView = DirectCast(Repeater1.FindControl("FormViewAddComment"), FormView)
Dim Comment As TextBox = DirectCast(FormView.FindControl("txtAddComment"), TextBox)
If Comment.Text = "" Then
Exit Sub
End If
End Sub
The Comment TextBox is not found and the code throws an Object reference error when it tries to access the Text property.
You can find the textbox inside it using ItemDataBound event.
Thanks
You are accessing "txtAddComment" which is there in FormView,then why are you finding FormView in Repeater and then again in textbox in that...you can directly find out it...
Protected Sub FormViewAddComment_ItemInserting(sender As Object, e As FormViewInsertEventArgs)
If (FormView1.CurrentMode == FormViewMode.Insert)
Dim Comment As TextBox = DirectCast(FormViewAddComment.FindControl("txtAddComment"), TextBox)
If Comment.Text = "" Then
Exit Sub
End If
End Sub
EDIT:-
My point is that you are writting the code in ItemInserting Event of FormView,so there you can directly find the FormView.I would suggest to use NamingContainer property in oredr to find the FormView which has trigged the event,by this way you can find the FormView then you can easily find the TextBox in it.
There is example of NamingContainer for Gridview Here
I have GridView DropDownList:
<asp:TemplateField HeaderText="Employer">
<ItemTemplate>
<asp:DropDownList ID="txtEmployer" runat="server" AutoPostBack="true"
OnSelectedIndexChanged="SelectedIndexChanged">
<asp:ListItem>Select</asp:ListItem>
<asp:ListItem Value="AllScripts">AllScripts</asp:ListItem>
<asp:ListItem Value="Contractor">Contractor</asp:ListItem>
<asp:ListItem Value="Other">Other</asp:ListItem>
</asp:DropDownList>
<asp:RequiredFieldValidator ID="RequiredFieldValidator6" runat="server"
ControlToValidate="txtEmployer" ErrorMessage="*"
InitialValue="Select"></asp:RequiredFieldValidator>
</ItemTemplate>
</asp:TemplateField>
And a TextBox:
<asp:TemplateField HeaderText="Other">
<ItemTemplate>
<asp:TextBox ID="txtOther" runat="server" TabIndex="435"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator7" runat="server"
ControlToValidate="txtOther" ErrorMessage="*"
SetFocusOnError="True"></asp:RequiredFieldValidator>
</ItemTemplate>
</asp:TemplateField>
The TexBox, by default, is hidden on PageLoad.
When a user selects the "Other" option, the TextBox becomes visible allowing the user to enter whatever value he/she wants. This works good so far.
We can successfully collect the value of the DropDownList and insert into the database successfully.
However, we are trying to figure out how to insert the value of txtOther TextBox and insert as part of the DropDownList. Hopefully, this last sentence makes sense.
I have tried the folling:
Dim table As DataTable = TryCast(ViewState("CurrentTable"), DataTable)
If table IsNot Nothing Then
For Each row As DataRow In table.Rows
Dim txLName As String = TryCast(row.ItemArray(1), String)
Dim txName As String = TryCast(row.ItemArray(2), String)
Dim txEmail As String = TryCast(row.ItemArray(3), String)
Dim txRole As String = TryCast(row.ItemArray(4), String)
Dim txPhone As String = TryCast(row.ItemArray(5), String)
Dim drpEmpl As String = TryCast(row.ItemArray(6), String)
If drpEmpl = "Other" Then
drpEmpl = txtOther.Text
Else
drpEmpl = TryCast(row.ItemArray(6), String)
End If
I am getting an error that txtOther.Text is not declared and may be inaccessible.
drpEmpl is the name of the DropDownList.
I have tried:
drpEmpl = gridview1.FindControl("txtOther")
But same issue.
Here is something I would try.
User enters text into txtOther and submits page
Take what user submitter and store it into viewstate variable (some array may be best for this in case more values are needed)
Modify your txtEmployer and add event handler for OnLoad
In the event handler for OnLoad you just add another option for drop down list.
foreach (string s in ArrayOfPreviouslyAddedValues){
ddl.Items.Add(new ListItem(s, s));
}
Another option is to store all values for all options in some background source (database or what ever) and to programatically databind values to your drop down list.
This is C# but you see the point.