CODEWITHSUNDEEP
asp.net
Belinda
Belinda

Reputation: 116

How to bind hashtable with listbox

Iam belinda. now only i learn the asp.net controls.. I have tried the following code. But i got an error..

I have used a code to bind the hashtable with listbox but i cant.

Anyone please help me to understand the hashtable and the bind concept clearly...

.aspx

<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Hashtable.aspx.vb" Inherits="Hashtable" %>

<!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 id="Head1" runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Button" />
        <br />
        <asp:ListBox ID="ListBox1" runat="server"></asp:ListBox><br />
    </div>
    </form>
</body>
</html>

.aspx.vb:

#Region "Namespaces"

Imports System.Data
Imports System.IO
Imports System.Net.Mail

#End Region
Partial Class Hashtable
    Inherits System.Web.UI.Page

    Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim ht As New Hashtable
        ht.Items.Add("1", "Sunday")
        ht.Items.Add("2", "Monday")
        ht.Items.Add("3", "Tuesday")
        ht.Items.Add("4", "Wednesday")
        ht.Items.Add("5", "Thursday")
        ht.Items.Add("6", "Friday")
        ht.Items.Add("7", "Saturday")

        ListBox1.DataSource = ht
        ListBox1.DataValueField = "Key"
        ListBox1.DataTextField = "Value"
        ListBox1.DataBind()


    End Sub
End Class

Upvotes: 0

Views: 1021

Answers (2)

Pawan
Pawan

Reputation: 1075

Don’t use the old Hashtable class, use the replacement Dictionary instead. The same is true for (almost) all classes from the System.Collections namespace.

though you can try

Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim ht As New Hashtable
        ht.Items.Add("1", "Sunday")
        ht.Items.Add("2", "Monday")
        ht.Items.Add("3", "Tuesday")
        ht.Items.Add("4", "Wednesday")
        ht.Items.Add("5", "Thursday")
        ht.Items.Add("6", "Friday")
        ht.Items.Add("7", "Saturday")

       foreach (var item in ht)
    {
        ListBox1.Items.Add(item.Value)
    }


    End Sub

Upvotes: 0

Nayeem Mansoori
Nayeem Mansoori

Reputation: 831

I think it is possible to databind to a hash table.

Something like this should work

Hashtable myHashTable = new HashTable();
myHashTable.Add ("First", "The first item");
myHashTable.Add ("Second", "The second item");
myHashTable.Add ("Third", "The third item");


ddlMyDropDownList.DataSource = myHashTable.Keys;
ddlMyDropDownList.DataBind();

In Your Code Here:

Partial Class _Default
Inherits System.Web.UI.Page

Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click

    Dim ht As Hashtable = New Hashtable(7)
    ht.Add("1", "Sunday")
    ht.Add("2", "Monday")
    ht.Add("3", "Tuesday")
    ht.Add("4", "Wednesday")
    ht.Add("5", "Thursday")
    ht.Add("6", "Friday")
    ht.Add("7", "Saturday")

    ListBox1.DataSource = ht
    ListBox1.DataValueField = "Key"
    ListBox1.DataTextField = "Value"
    ListBox1.DataBind()

End Sub

End Class

Upvotes: 2

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