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.NET Forum / Languages / VB.NET / May 2008problem how to pass value from one procedure to another
Hi, I create 5 dropdownlist in code-behind. I want to insert their selectedvalues in a table by making a string separated with ":" I can get their selecedvalues but i'm stuck when i want to execute the insert. The error is "name dd is not declared" (in line: selvalue = selvalue & Session("dd" & dd.id) & ":" Any idea how to solve this? Thanks for help Dan Dim dd() As DropDownList Dim i As Integer for i= 1 to 5 dd(i) = New DropDownList dd(i).ID = id 'can be anything next For Each d As DropDownList In dds AddHandler d.SelectedIndexChanged, AddressOf dropd Next Protected Sub dropd(ByVal sender As Object, ByVal e As System.EventArgs) Dim dd As DropDownList = CType(sender, DropDownList) Session("dd" & id) = dd.SelectedValue End Sub Protected Sub submit_Click(ByVal sender As Object, ByVal e As System.EventArgs) Dim i As Integer Dim selvalue As String For i = 1 To 5 selvalue = selvalue & Session("dd" & dd.id) & ":" Next sql="insert ....." ... Dan, I don't know what other errrors there can be, but in my idea is dd (the dropdownList) not declared, in all other methods you are getting it from the sender or declare it new. Cor > Hi, > [quoted text clipped - 35 lines] > sql="insert ....." > ... Inline comments: > Hi, > [quoted text clipped - 6 lines] > > Any idea how to solve this? > Dim dd() As DropDownList > Dim i As Integer [quoted text clipped - 3 lines] > dd(i).ID = id 'can be anything > next What is id? It is not declared anywhere, and is never assigned a value. In every sense of the word, it is nothing. It would make more sense to write something like dd(i).ID = i which would assign the value of i to the ID property of the dropdown. > Protected Sub dropd(ByVal sender As Object, ByVal e As > System.EventArgs) Dim dd As DropDownList = CType(sender, DropDownList) > Session("dd" & id) = dd.SelectedValue > End Sub Again, what is id? It is not declared anywhere, and is never assigned a value. In every sense of the word, it is nothing. It would make more sense to write something like Session("dd" & dd.ID) = dd.SelectedValue which would store the selected value in a session variable with the name ddx, where x is the value of the ID property of the drop down, as assigned in the previous loop above. > Protected Sub submit_Click(ByVal sender As Object, ByVal e As > System.EventArgs) [quoted text clipped - 4 lines] > Next > sql="insert ....." This is closer, in that dd.id is presumably an attempt to get the ID property of a drop down. Unfortunately, dd itself is never declared, and never assigned a value, and this time it is dd that is nothing. It would make more sense to write selvalue = selvalue & Session("dd" & i) which will retrieve each of the 5 values stored in session variables by the event handler above - if all five have been set. It might be a good idea to store something in the Session variables for all 5 to start with, in case some of them never get set. The first loop would be a suitable place to do that. Thanks for replying. I think my explanation was not good enough. I ommitted some code to restrict the message. This is the real problem: there are a unknown number of dropdownlist (questions of a survey) (i took 5 as example) depending of the user who create the questions. The dropdownlists (some are not visible) have the property AutoPostBack = true, because the value of dropdownlist x can make another further dropdownlist visible. So each time an user introduces a value, the depending DD will be visible or remains unvisible. This is solved. Now, i want to collect all the selectedvalues and put them into a table. But i can't find a way to pass the collected selectedvalues in the submit procedure. Friend dds As New List(Of DropDownList) ... Dim dd() As DropDownList For i = 1 To (number of dropdownlist) dd(i) = New DropDownList dd(i).ID = id 'id is the id of the related quesion in the table dd(i).AutoPostBack = True 'fed from table ... form1.Controls.Add(dd(i)) ... For Each d As DropDownList In dds AddHandler d.SelectedIndexChanged, AddressOf dropd Next Protected Sub dropd(ByVal sender As Object, ByVal e As System.EventArgs) Dim dd As DropDownList = CType(sender, DropDownList) session(dd.ID)=dd.selectedValue End Sub Protected Sub submit_Click(ByVal sender As Object, ByVal e As System.EventArgs) 'how to get the selectvalue here? End Sub Thanks > Inline comments: > [quoted text clipped - 56 lines] > all 5 to start with, in case some of them never get set. The first loop > would be a suitable place to do that. > Protected Sub submit_Click(ByVal sender As Object, ByVal e As > System.EventArgs) > 'how to get the selectvalue here? I think you need something like DirectCast(sender, DropDownList).SelectedValue (and I hope you have Option Strict On at the top of the script). Andrew Thanks but i don't understand what you mean. I have the selectedvalue in procedure Sub dropd. The problem is: how to put it in procedure Sub submit_Click in order to insert it in the table? Where should i put your code? thanks >> Protected Sub submit_Click(ByVal sender As Object, ByVal e As >> System.EventArgs) [quoted text clipped - 5 lines] > > Andrew > Thanks but i don't understand what you mean. Ignore what I wrote - it was rubbish. It is Steve Gerrard's post that makes sense. Andrew Andrew, Just ignoring my post? As the computer tells, > The error is "name dd is not declared" (in line: selvalue = selvalue & > Session("dd" & dd.id) & ":" In the procedure Protected Sub submit_Click(ByVal sender As Object, ByVal e As System.EventArgs) Dim i As Integer Dim selvalue As String For i = 1 To 5 selvalue = selvalue & Session("dd" & dd.id) & ":" Next sql="insert ....." Then it has nothing to do with an ID, it is as is told. The object dd is not declared. And as we could see that it was declared in another method the change that it is a global object is low. Cor >> Thanks but i don't understand what you mean. > > Ignore what I wrote - it was rubbish. It is Steve Gerrard's post that > makes sense. > > Andrew Cor, i don't ignore your post, but please, forget Andrew and give me at least a hint (i reformulated the global problem two posts above. Thanks > Andrew, > [quoted text clipped - 28 lines] >> >> Andrew Dan, In my idea are you thinking that dd is a dropdownlist box, but it is not even declared in your procedure somewhere else you write. dim dd as dropdownlist = DirectCast(sender, DropdownList) (You use CType, but DirectCast is better in this case because it does not have to convert, the sender is your dropdownlist in an object) I have the idea that it is something the same. Cor > Cor, > [quoted text clipped - 34 lines] >>> >>> Andrew > Protected Sub dropd(ByVal sender As Object, ByVal e As > System.EventArgs) Dim dd As DropDownList = CType(sender, DropDownList) [quoted text clipped - 5 lines] > 'how to get the selectvalue here? > End Sub Okay, at the submit_Click event, the sender is the submit button, so that is no help. You have two choices: look through the dropdowns themselves, or look in the Session object. If you are maintaining ViewState, the dropdowns should be present and have the current SelectedValue. Your dropd event handler will also have stored any that changed in the Session object, if you are using that instead. If you are going to use ViewState, you don't need the event handler to store anything in Session. Just gather the selected values from your dd array of drop down lists. If you are going to use the Session object, you should initialize it with the initial values of all the dropdown selected values, so there is one value for each drop down. That will get updated if any are changed by the user, using your event. Then you can retrieve all the selected values from the Session object in your submit event. Since you assigned IDs to the dropdowns from a table of questions, you can use the same table to come up with the IDs you need to retrieve the stored values. Air code for that looks like For each nID in tableOfQuestionIDs selvalue = selvalue & Session(nID) & ":" Next nID Thanks >> Protected Sub dropd(ByVal sender As Object, ByVal e As >> System.EventArgs) Dim dd As DropDownList = CType(sender, DropDownList) [quoted text clipped - 28 lines] > selvalue = selvalue & Session(nID) & ":" > Next nID Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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