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ASP.NET Discussion Thread
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Dec 1st, 2008

listbox and selectedvalue urgent

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hi,

I am trying to add a value to listbox. i use lstlistbox.items.add(new listitem(value)).

this adds it fine in click event of button, but i need to use the selectedvalue of the listbox again in same event.

as the listbox item doesnt show i cant use selectedvalue. is there a way to first populate the listbox with its selected value then somehow use the value.

thanks

sam1

Reputation Points: 10

Solved Threads: 1

Posting Whiz

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300 posts
since Nov 2004

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Dec 1st, 2008

Re: listbox and selectedvalue urgent

I'm sorry but I don't understand your problem.
Lets assume you have the below stated example, it adds a few items to the listbox and after a selection is done, it responds the selected value to the page.....

Is thát what you achieved?

ASP.NET Syntax (Toggle Plain Text)
Partial Class _Default
    Inherits System.Web.UI.Page
 
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        If Not Page.IsPostBack Then
 
            For iCnt As Integer = 1 To 5
                Dim lItem As New ListItem
                lItem.Text = String.Format("New Item {0}", iCnt.ToString)
                lItem.Value = iCnt
                Me.ListBox1.Items.Add(lItem)
                lItem = Nothing
            Next iCnt
        End If
    End Sub
 
    Protected Sub ListBox1_SelectedIndexChanged( _
            ByVal sender As Object, _
            ByVal e As System.EventArgs) _
            Handles ListBox1.SelectedIndexChanged
        HttpContext.Current.Response.Write( _
             String.Format("Selected Value = {0}", _
             CType(sender, ListBox).SelectedValue.ToString))
    End Sub
End Class
Partial Class _Default
    Inherits System.Web.UI.Page

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

            For iCnt As Integer = 1 To 5
                Dim lItem As New ListItem
                lItem.Text = String.Format("New Item {0}", iCnt.ToString)
                lItem.Value = iCnt
                Me.ListBox1.Items.Add(lItem)
                lItem = Nothing
            Next iCnt
        End If
    End Sub

    Protected Sub ListBox1_SelectedIndexChanged( _
            ByVal sender As Object, _
            ByVal e As System.EventArgs) _
            Handles ListBox1.SelectedIndexChanged
        HttpContext.Current.Response.Write( _
             String.Format("Selected Value = {0}", _
             CType(sender, ListBox).SelectedValue.ToString))
    End Sub
End Class

pagecode;

ASP.NET Syntax (Toggle Plain Text)
<%@ Page 
    Language="VB" 
    AutoEventWireup="false" 
    CodeFile="Default.aspx.vb" 
    Inherits="_Default" %>
<!DOCTYPE 
    html PUBLIC 
    "-//W3C//DTD XHTML 1.0 Transitional//EN" 
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form 
        id="form1" 
        runat="server">
    <div>
        <asp:ListBox 
            ID="ListBox1" 
            runat="server" 
            AutoPostBack="True" />
    </div>
    </form>
</body>
</html>
<%@ Page 
    Language="VB" 
    AutoEventWireup="false" 
    CodeFile="Default.aspx.vb" 
    Inherits="_Default" %>
<!DOCTYPE 
    html PUBLIC 
    "-//W3C//DTD XHTML 1.0 Transitional//EN" 
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form 
        id="form1" 
        runat="server">
    <div>
        <asp:ListBox 
            ID="ListBox1" 
            runat="server" 
            AutoPostBack="True" />
    </div>
    </form>
</body>
</html>

Last edited by 4advanced; Dec 1st, 2008 at 7:48 am.

4advanced

Reputation Points: 33

Solved Threads: 10

Junior Poster in Training

Offline

67 posts
since Nov 2008

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Dec 2nd, 2008

Re: listbox and selectedvalue urgent

hii

Add the code code in your .aspx

ASP.NET Syntax (Toggle Plain Text)
<asp:DropDownList id="ddl1"  runat="server" AutoPostBack="True" AppendDataBoundItems="True"   >   
        <asp:ListItem Selected="True" Value="-1">--Select Me--</asp:ListItem>
        <asp:ListItem Value="1">Value 1</asp:ListItem>
        <asp:ListItem Value="2">Value 2</asp:ListItem>
 
     </asp:DropDownList>
<asp:DropDownList id="ddl1"  runat="server" AutoPostBack="True" AppendDataBoundItems="True"   >   
        <asp:ListItem Selected="True" Value="-1">--Select Me--</asp:ListItem>
        <asp:ListItem Value="1">Value 1</asp:ListItem>
        <asp:ListItem Value="2">Value 2</asp:ListItem>
        
     </asp:DropDownList>

And you can bind additional values at run time from database and can use selected

ASP.NET Syntax (Toggle Plain Text)
Private Sub ddl1_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles ddl1.SelectedIndexChanged
 
your code 
    End Sub
Private Sub ddl1_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles ddl1.SelectedIndexChanged
       
your code 
    End Sub

Mark as solved if it helps you!!!

Regards

reach_yousuf

Reputation Points: 12

Solved Threads: 38

Junior Poster

Offline

194 posts
since Sep 2007

Permalink

Dec 3rd, 2008

Re: listbox and selectedvalue urgent

can u specify problem

paslanmaz

Reputation Points: 9

Solved Threads: 2

Newbie Poster

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13 posts
since Nov 2008

This thread is more than three months old

No one has posted to this discussion for at least three months. Please let old threads die and do not reply to them unless you feel you have something new and valuable to contribute that absolutely must be added to make the discussion complete. Otherwise, please start a new thread in this forum instead.

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