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When For m 6 init ially loads, it aut om at ically select s t he fir st it em in List Box 1. This, in t ur n, fires t he second event procedure behind t he for m List Box 1_Select edI ndexChanged. As a consequence, t his second procedure set s t he Text proper ty of Text Box1 t o 1 and t he it em s in List Box2 t o t he nam es for pr oduct s belonging t o t he Bev er ages cat egory. The second event procedur e populat es Tex t Box1 based on t he index value for t he select ed it em in List Box1. Because t his index st art s at 0, t he procedur e adds 1 t o t he index value so t hat t he r ange ext ends from 1 t hr ough 8 for each of t he Cat egoryI D values in t he Cat egor ies t able t hat t he udpList OfCat egoryNam esAsDat aset Web m et hod quer ies. Next t he List Box1_Select edI ndexChanged procedure connect s t o t he SoapFor 13 Web serv ice wit h t he xws1 proxy v ar iable before invok ing t he udfProduct sI nACat egor yAsDat aset Web m et hod. The synt ax for t he st at em ent inv ok ing t he Web m et hod illust rat es how t o pass a par am et er t o a user- defined funct ion. The param et er is t he Text proper t y set t ing for Tex t Box1 conver t ed t o an I nt eger dat a t y pe. Because Tex t Box1 show s a Cat egoryI D v alue, t he Web m et hod ret ur ns t he Pr oduct Nam e colum n v alues from t he Pr oduct s t able in t he Nort hw ind dat abase for rows wit h a m at ching Cat egoryI D v alue. The procedur e com es t o an end by using t he t able in t he dat a set st or ing t he ret ur n set from t he Web m et hod as t he Dat aSource proper t y for List Box2. Private Sub Form6_Load(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles MyBase.Load Declare Web service xws1 as SoapFor13 in the localhost3 Web reference. Dim xws1 As New XMLWebServiceClients.localhost3.SoapF or13() Save return from Web service method as a data set. Dim das1 As System.Data.DataSet Dim returnvalue As Integer das1 = xws1.udpListOfCategoryNamesAsDataset(returnval ue)
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Populate list box with category names. Automatic selection of first item in ListBox1 invokes ListBox1_SelectedIndexChanged event procedure to populate TextBox1 and ListBox2. ListBox1.DataSource = das1.Tables(0) ListBox1.DisplayMember = _ CStr(das1.Tables(0).Columns(1).ColumnName) End Sub Private Sub ListBox1_SelectedIndexChanged( _ ByVal sender As System.Object, _ ByVal e As System.EventArgs) _ Handles ListBox1.SelectedIndexChanged Compute CategoryID for selected value. TextBox1.Text = ListBox1.SelectedIndex + 1 Declare Web service xws1 as SoapFor13 in the localhost3 Web reference. Dim xws1 As New XMLWebServiceClients.localhost3.SoapF or13() Save return from Web service method as a data set ba sed on CategoryID value in text box; notice returnvalue par ameter is not necessary with a SQL Server function procedur e. Dim das1 As System.Data.DataSet das1 = _ xws1.udfProductsInACategoryAsDataset(CInt(TextBox 1.Text)) Populate second list box with product names for products in currently selected category in the first list box. ListBox2.DataSource = das1.Tables(0) ListBox2.DisplayMember = _ das1.Tables(0).Columns(0).ColumnName End Sub
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