listbox and dropdownlist bug in VS2005 webdeveloper??

[maghi85]

hi,
i'm working on a website with lots of webcontrols on visual studio 2005
i'm trying to read the text on a drop down list but it always gives me the initial text and not the text that is selected by the user?
is this a bug or is there another way about it?
ive tried this

Dim A as string = dropdownlist1.selecteditem.text 'gives initial text
Dim A as string = dropdownlist1.text                    'also gives initial text

???

[kenobewan]

Try selected value and see what happens.

[maghi85]

Try selected value and see what happens.

doesn't work either... gives the initial value =(

[gomzi]

hi,
i'm working on a website with lots of webcontrols on visual studio 2005
i'm trying to read the text on a drop down list but it always gives me the initial text and not the text that is selected by the user?
is this a bug or is there another way about it?
ive tried this

Dim A as string = dropdownlist1.selecteditem.text 'gives initial text
Dim A as string = dropdownlist1.text                    'also gives initial text

???

if you are binding your dropdownlist1 in page load, then place that code inside ->

if not ispostback then
YOUR CODE HERE
endif

Your problem may be because, everytime postback occurs, the controls get binded again. so, you will have to prevent the controls from being binded again when postback occurs.

[maghi85]

if you are binding your dropdownlist1 in page load, then place that code inside ->

if not ispostback then
YOUR CODE HERE
endif

Your problem may be because, everytime postback occurs, the controls get binded again. so, you will have to prevent the controls from being binded again when postback occurs.

how do you place the code inside?

[gomzi]

how do you place the code inside?

What do you mean by that?

[maghi85]

What do you mean by that?

you wrote

if you are binding your dropdownlist1 in page load, then place that code inside ->

if not ispostback then
YOUR CODE HERE
endif

please explain

[gomzi]

you wrote

if you are binding your dropdownlist1 in page load, then place that code inside ->

if not ispostback then
YOUR CODE HERE
endif

please explain

I explained earlier too maghi85.
Anyway....
Normally, what happens is that when a page loads, the contents in the page_load sub get executed.
i.e. in your case suppose you have placed the code for binding dropdownlist in the page_load area, then it gets binded with that data when the page is requested.
Now, later on when a postback occurs, i.e. either through a button or autopostback of your dropdownlist or whatever, the execution starts from the page load before it goes to the event for that respective control.
so, if you don't place your code inside "if not ispostback", then the dropdownlist(in your case) gets binded again with the data. And since it gets binded again, the default value also gets set again.
so, finally when you try to receive the selected value through the event for the control what you get is the default value that has been set again in the page load sub(in the absence of 'if not ispostback').
so, since you say that you are not getting the selected value through the event, the only problem which might be possible IMO is that you are binding the dropdownlist again.
so check it out!

wow!!! not written such a long explanation. am impressed!

Regards,
Gomzi.

[Wing]

An example of what Gomzi is trying to say without writing it for you

Code on default.aspx

<asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True">
            <asp:ListItem Value="1">Value 1</asp:ListItem>
            <asp:ListItem Value="2">Value 2</asp:ListItem>
            <asp:ListItem Value="3">Value 3</asp:ListItem>
</asp:DropDownList

Code on default.aspx.vb

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        If Not IsPostBack Then
            'Bind Data
        End If
End Sub

Protected Sub DropDownList1_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles DropDownList1.SelectedIndexChanged
        Dim A As String = DropDownList1.SelectedItem.Text
        Dim B As String = DropDownList1.SelectedValue
        Response.Write(A & "<br>" & B)
End Sub

Written to the browser when the index is changed.

Value 2
2

Hope that helps you out more.

[maghi85]

thanks alot you guys
i haven't tried it yet
but im sure it'll work....
now I have a better understanding