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<%--
Code revised from
ASP.NET Tips & Techniques (Paperback)
by Greg Buczek
# Publisher: McGraw-Hill/Osborne Media; 1st edition (May 21, 2002)
# Language: English
# ISBN: 0072225149
--%>
<%@ Page Language=VB Debug=true %>
<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Data.OLEDB" %>
<script runat=server>
Sub Page_Load(ByVal Sender as Object, ByVal E as EventArgs)
If Not IsPostBack Then
Dim DBConn as OleDbConnection
Dim DBCommand As OleDbDataAdapter
Dim DSPageData as New DataSet
DBConn = New OleDbConnection( _
"PROVIDER=Microsoft.Jet.OLEDB.4.0;" _
& "DATA SOURCE=" _
& Server.MapPath _
("StoresDB.mdb;"))
DBCommand = New OleDbDataAdapter _
("Select Distinct State From Stores " _
& "Order By State", DBConn)
DBCommand.Fill(DSPageData, _
"States")
ddlStates.DataSource = _
DSPageData.Tables("States").DefaultView
ddlStates.DataBind()
End If
End Sub
Sub ddlState_Changed(Sender As Object, E As EventArgs)
Dim DBConn as OleDbConnection
Dim DBCommand As OleDbDataAdapter
Dim DSPageData as New DataSet
DBConn = New OleDbConnection( _
"PROVIDER=Microsoft.Jet.OLEDB.4.0;" _
& "DATA SOURCE=" _
& Server.MapPath _
("StoresDB.mdb;"))
DBCommand = New OleDbDataAdapter _
("Select Distinct City From Stores " _
& "Where State = '" & ddlStates.SelectedItem.Text _
& "' Order By City", DBConn)
DBCommand.Fill(DSPageData, _
"Cities")
ddlCities.DataSource = _
DSPageData.Tables("Cities").DefaultView
ddlCities.DataBind()
ddlCities.Visible = True
lblMessage3.Visible = True
End Sub
Sub ddlCity_Changed(Sender As Object, E As EventArgs)
Dim DBConn as OleDbConnection
Dim DBCommand As OleDbDataAdapter
Dim DSPageData as New DataSet
DBConn = New OleDbConnection( _
"PROVIDER=Microsoft.Jet.OLEDB.4.0;" _
& "DATA SOURCE=" _
& Server.MapPath _
("StoresDB.mdb;"))
DBCommand = New OleDbDataAdapter _
("Select StoreName as [Store Name], " _
& "Address From Stores " _
& "Where City = '" _
& ddlCities.SelectedItem.Text & "' " _
& "And State = '" _
& ddlStates.SelectedItem.Text & "' " _
& "Order By StoreName", DBConn)
DBCommand.Fill(DSPageData, _
"Stores")
dgStores.DataSource = _
DSPageData.Tables("Stores").DefaultView
dgStores.DataBind()
End Sub
</SCRIPT>
<HTML>
<HEAD>
<TITLE>Store Location</TITLE>
</HEAD>
<Body LEFTMARGIN="40">
<form runat="server">
<BR><BR>
<asp:label
id="lblMessage2"
font-size="10pt"
font-name="Lucida Console"
text="Select a State"
runat="server"
/>
<BR>
<asp:dropdownlist
id="ddlStates"
datatextfield="State"
autopostback="True"
onselectedindexchanged="ddlState_Changed"
runat="server"
/>
<BR><BR>
<asp:label
id="lblMessage3"
font-size="10pt"
font-name="Lucida Console"
text="Select a City"
visible="False"
runat="server"
/>
<BR>
<asp:dropdownlist
id="ddlCities"
datatextfield="City"
autopostback="True"
onselectedindexchanged="ddlCity_Changed"
visible="False"
runat="server"
/>
<BR><BR>
<asp:label
id="lblMessage1"
font-size="12pt"
font-bold="True"
font-name="Lucida Console"
text="Stores in Your Area"
runat="server"
/>
<BR><BR>
<asp:datagrid
id="dgStores"
runat="server"
autogeneratecolumns="True"
/>
</form>
</BODY>
</HTML>
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StoresDB.zip( 8 k)