To use HtmlSelect control is very easy and helpful. This tutorial will show you how to use the HtmlSelect control in ASP.NET and VB.NET 2.0.
Use the HtmlSelect control to create a selection box.
Specify item listings in the control by placing HTML <option> elements between the opening and closing <select> tags.
The following code example demonstrates how to create an HtmlSelect control by binding the control to a data source.
First, you will need to import the System.Web.UI.HtmlControls namespace.
The System.Web.UI.HtmlControls namespace contains the HtmlSelect Classes that we will use to create a selection box.
| Imports System.Web.UI.WebControls |
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We use the Button_Click event to do the work. Button_Click control to selection.
Sub Button_Click(ByVal sender As Object, ByVal e As EventArgs)
Dim i As Integer
Label1.Text = "You selected:"
For i = 0 To Select1.Items.Count - 1
If Select1.Items(i).Selected Then
Label1.Text = Label1.Text & "
- " & Select1.Items(i).Text
End If
Next i |
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HtmlSelect control by binding the control to a data source
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
If Not IsPostBack Then
Dim ConnectString As String = "server=localhost;database=pubs;integrated security=SSPI"
Dim QueryString As String = "select * from authors"
Dim myConnection As SqlConnection = New SqlConnection(ConnectString)
Dim myCommand As SqlDataAdapter = New SqlDataAdapter(QueryString, myConnection)
Dim ds As DataSet = New DataSet()
myCommand.Fill(ds, "Authors")
Select1.DataSource = ds
Select1.DataTextField = "au_fname"
Select1.DataValueField = "au_fname"
Select1.DataBind()
End If |
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The HtmlSelect.aspx page looks something like this:
<form id="form1" runat="server">
<fieldset>
<legend>HtmlSelect Example</legend>
<div>
Select items from the list. <br/>
Use the Ctrl or Shift key to select multiple items. <br/>
<select id="Select1" multiple="true" runat="server"/>
<br/>
<button id="Button1" onserverclick="Button_Click" runat="server">
Submit
</button>
<br/>
<asp:Label id="Label1" runat="server"/>
</div></fieldset>
</form> |
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The flow for the code behind page is as follows:
Imports System
Imports System.Data
Imports System.Data.SqlClient
Partial Class HtmlSelect
Inherits System.Web.UI.Page
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
If Not IsPostBack Then
Dim ConnectString As String = "server=localhost;database=pubs;integrated security=SSPI"
Dim QueryString As String = "select * from authors"
Dim myConnection As SqlConnection = New SqlConnection(ConnectString)
Dim myCommand As SqlDataAdapter = New SqlDataAdapter(QueryString, myConnection)
Dim ds As DataSet = New DataSet()
myCommand.Fill(ds, "Authors")
Select1.DataSource = ds
Select1.DataTextField = "au_fname"
Select1.DataValueField = "au_fname"
Select1.DataBind()
End If
End Sub
Sub Button_Click(ByVal sender As Object, ByVal e As EventArgs)
Dim i As Integer
Label1.Text = "You selected:"
For i = 0 To Select1.Items.Count - 1
If Select1.Items(i).Selected Then
Label1.Text = Label1.Text & "
- " & Select1.Items(i).Text
End If
Next i
End Sub |
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