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Button click doesn't update number

Posted on 2009-05-05
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Medium Priority
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Last Modified: 2013-11-27
Hi guys,

I have the following code for my item.aspx page. User clicks on the Add to Shopping Cart button. Record gets inserted in shopping cart table. The shopping cart link is supposed to change to Shopping Cart (Number_of_items_in_cart_here). But it doesn't change unless I go to another page after clicking the button or refresh page. How do I make that change after the first click? Inserting in the table works fine. I added master page code that actually checks for number of items in shopping cart table. Basically, itemsInCart var doesn't get updated after the button was clicked. It updates only after I navigate to some other page or refresh item.aspx. I guess there is a problem with my master page. Please help.

Thanks.

item.aspx:
 
    Protected Sub ImageButton1_Click(ByVal sender As Object, ByVal e As System.Web.UI.ImageClickEventArgs) Handles ImageButton1.Click
        Dim strConn As String = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=|DataDirectory|\titanmusic.accdb;Persist Security Info=True"
        Dim objConnection As New System.Data.OleDb.OleDbConnection(strConn)
        Dim strSQL As String = "INSERT INTO Cart (SessionID, ProductFK1) VALUES ('" & Session.SessionID & _
                                     "', " & DetailsView1.DataKey.Value & ")"
        Dim objCommand As New System.Data.OleDb.OleDbCommand(strSQL, objConnection)
 
        Try
            objConnection.Open()
            Try
                objCommand.ExecuteNonQuery()
            Catch ex As Exception
                MsgBox(Err.Number & " " & Err.Description)
            Finally
                objConnection.Close()
            End Try
        Catch ex As Exception
            MsgBox(Err.Number & " " & Err.Description)
        End Try
 
    End Sub
 
Master Page:
 
Public itemsInCart As Integer
 
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        Session("SCart") = "CartSession"
        Dim ctl As Control
        Dim strConn As String = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=|DataDirectory|\titanmusic.accdb;Persist Security Info=True"
        Dim objConnection As New System.Data.OleDb.OleDbConnection(strConn)
        Dim strSQL As String = "SELECT COUNT(*) FROM Cart WHERE SessionID='" & Session.SessionID & "'"
        Dim objCommand As New System.Data.OleDb.OleDbCommand(strSQL, objConnection)
 
        Try
            objConnection.Open()
 
            itemsInCart = objCommand.ExecuteScalar
 
            objConnection.Close()
        Catch ex As Exception
            MsgBox("Connection failed to open. Error: " & ex.ToString())
        End Try
 
    End Sub
 
                                    <% 
                                        If itemsInCart = 0 Then
                                            Response.Write("Shopping Cart")
                                        Else
                                            Response.Write("Shopping Cart (" & itemsInCart & ")")
                                        End If
                                    %>

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Question by:Yury Merezhkov
2 Comments
 
LVL 10

Accepted Solution

by:
JPJ78 earned 2000 total points
ID: 24302810
The click event is handled after Page_Load, therefore has the new item not been inserted when you count the items in your masterpage.
Move the counting to PreRender.



    Protected Sub Page_PreRender(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.PreRender
        Session("SCart") = "CartSession"
        Dim ctl As Control
        Dim strConn As String = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=|DataDirectory|\titanmusic.accdb;Persist Security Info=True"
        Dim objConnection As New System.Data.OleDb.OleDbConnection(strConn)
        Dim strSQL As String = "SELECT COUNT(*) FROM Cart WHERE SessionID='" & Session.SessionID & "'"
        Dim objCommand As New System.Data.OleDb.OleDbCommand(strSQL, objConnection)
 
        Try
            objConnection.Open()
 
            itemsInCart = objCommand.ExecuteScalar
 
            objConnection.Close()
        Catch ex As Exception
            MsgBox("Connection failed to open. Error: " & ex.ToString())
        End Try
 
    End Sub

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Author Comment

by:Yury Merezhkov
ID: 24304142
That worked beautifully, thank you!
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