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popluate combobox fill gridview from webservice

Posted on 2008-06-14
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Last Modified: 2013-11-26
Create a window application to display sales for a selected store using multitier application. Allow the user to select store name from a drop down list.

Use sales and stores from the pubs database. sales table stor_id, ord_num, ord_date, qty, payterms, and title_id columns. Stores table has stor_id, stor_name, stor_address, city, state and zip columns.

Right the combobox is work. The GridView is displaying the id number I have in the sql statement. How do get it to display the results of the combobox?

Any help would be appreciated


<WebMethod()> Public Function dat(ByVal services As String) As DataSet

        Dim cn As New SqlConnection

        Dim da As SqlDataAdapter

        Dim strSelect As String

        Dim ds As DataSet

        Dim cnstring As String

        cnstring = "Data Source=.\SQLExpress; Initial Catalog=PUBS; Integrated Security=True;"

 

        cn = New SqlConnection(cnstring)

        cn.Open()

 

        'strSelect = "SELECT DISTINCT stores.stor_name, sales.stor_id FROM (stores INNER JOIN sales ON stores.stor_id = sales.stor_id)"

        strSelect = "SELECT * FROM Stores"

 

        da = New SqlDataAdapter(strSelect, cn)

        ds = New DataSet

        da.Fill(ds, "Stores")

        dat = ds

 

    End Function

 

    <WebMethod()> Public Function data(ByVal selected As String) As DataSet

        Dim cnstring As String

        Dim strSelect As String

        Dim ds As DataSet

        Dim da As SqlDataAdapter

 

        cnstring = "Data Source=.\SQLExpress; Initial Catalog=PUBS; Integrated Security=True;"

 

        strSelect = "SELECT stor_id, ord_num, ord_date, qty, payterms, title_id FROM Sales WHERE stor_id=7067"

 

        Dim cn As New SqlConnection(cnstring)

        cn.Open()

        Dim cmd As New SqlCommand(strSelect, cn)

 

        da = New SqlDataAdapter(strSelect, cn)

        ds = New DataSet

 

        da.Fill(ds, "Sales")

        Return ds

 

    End Function

 

 

 

Public Class Form1

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

        Dim combo As New localhost.Service()

        ComboBox1.DataSource = combo.dat.Tables(0)

        ComboBox1.DisplayMember = "stor_name"

        ComboBox1.ValueMember = "stor_id"

 

    End Sub

 

    Public Sub ComboBox1_SelectedIndexChanged(ByVal test As System.Object, ByVal e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged

 

        Dim combo1 As New localhost.Service()

        DataGridView1.DataSource = combo1.data

    End Sub

End Class

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Question by:designaire
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4 Comments
 
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Expert Comment

by:PockyMaster
ID: 21788898
You are gonna have to pass the ComboBox1.selectedValue to your webservice call..
e.g. combo1.data(ComboBox1.selectedValue )

make sure that that inside your webservice query the selected value ends up in your WHERE clause.
e.g.
 strSelect =  string.Format("SELECT stor_id, ord_num, ord_date, qty, payterms, title_id FROM Sales WHERE stor_id={0}", selected)

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Author Comment

by:designaire
ID: 21789204
I guess I know that's what I'm supposed to do but everytime I try it, I get some kind of error message.
I added the selection variable to the webservices though the public function and added it to the sql string. I"m doing something wrong because it doesn't work. It says there's an error message after the the = in the sql statement.

Thanks

selection = ComboBox1.SelectedValue.ToString
 

    <WebMethod()> Public Function data(ByVal selection As String) As 

     

        cnstring = "Data Source=.\SQLExpress; Initial Catalog=PUBS; Integrated Security=True;"

        'strSelect = "SELECT * from Sales"
 
 

        strSelect = "SELECT stor_id, ord_num, ord_date, qty, payterms, title_id FROM Sales WHERE stor_id=selection = ComboBox1.SelectedValue.ToString" & selection & ""

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Author Comment

by:designaire
ID: 21789296
Sorry made a mistake on the sql statement...

selection = ComboBox1.SelectedValue.ToString
 
    <WebMethod()> Public Function data(ByVal selection As String) As
     
        cnstring = "Data Source=.\SQLExpress; Initial Catalog=PUBS; Integrated Security=True;"
        'strSelect = "SELECT * from Sales"
 
       strSelect = "SELECT stor_id, ord_num, ord_date, qty, payterms, title_id FROM Sales WHERE stor_id=" & selection & """"
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LVL 14

Accepted Solution

by:
PockyMaster earned 125 total points
ID: 21791599
or you could copy/paste the line I put in there?

strSelect =  string.Format("SELECT stor_id, ord_num, ord_date, qty, payterms, title_id FROM Sales WHERE stor_id={0}", selected)

or when stor_id is a string:
strSelect =  string.Format("SELECT stor_id, ord_num, ord_date, qty, payterms, title_id FROM Sales WHERE stor_id='{0}' ", selected)
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