ASP.NET

listbox and selectedvalue urgent

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Join Date: Nov 2004

Posts: 259

Reputation: sam1 is an unknown quantity at this point

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sam1

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listbox and selectedvalue urgent

Dec 1st, 2008

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

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Join Date: Nov 2008

Posts: 63

Reputation: 4advanced is an unknown quantity at this point

Solved Threads: 10

4advanced

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Junior Poster in Training

Re: listbox and selectedvalue urgent

Dec 1st, 2008

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?

 Help with Code Tags 
 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;

 Help with Code Tags 
 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.

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Join Date: Sep 2007

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reach_yousuf reach_yousuf is offline

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Re: listbox and selectedvalue urgent

Dec 2nd, 2008

hii

Add the code code in your .aspx

 Help with Code Tags 
 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

 Help with Code Tags 
 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