Caching problem?

[FredG]

I'm writing vb.net code with MS Access as the database using
OleDbConnection. The problem I'm having is, I write to the database
then I read back what I just wrote. The read appears to be from an
older cached version because I get the previous results. If I read
twice I usually get the correct results. Any ideas on how to suppress
this?

thanks,

fg

[RoyVidar]

"FredG" <fg*****@gmail.comwrote in message
<11*********************@h48g2000cwc.googlegroups. com>:

I'm writing vb.net code with MS Access as the database using
OleDbConnection. The problem I'm having is, I write to the database
then I read back what I just wrote. The read appears to be from an
older cached version because I get the previous results. If I read
twice I usually get the correct results. Any ideas on how to
suppress this?

thanks,

fg

Technically, you are not using Access as database, but Jet ;-)

The behaviour is known when using ADO connection, and here is a
Microsoft KB article on that http://support.microsoft.com/kb/200300.
How or if this relates to .Net, I don't know. If you don't get any
ansvers, then I suggest trying an NG dedicated to VB.Net.

--
Roy-Vidar

[rich w]

Hi Fred,

Here is what I do to read from an Access MDB into a VB.Net app which
does not seem to have any issues:

Imports System.Data.OleDB

Public Class Form1
Private Button1_Click(...) handles Button1.Click
Dim Conn As New OleDBConnection("Provider=Microsoft.Jet.OLED.4.0;
Data Source="C:\test1.mdb;")
Dim da As New OleDbDataAdapter, ds As New Dataset
da.SelectCommand = New OleDbCommand
da.SelectCommand.Connection = conn
da.SelectCommand.CommandTye = CommandType.Text
da.SelectCommand.CommandText = "Select * from Table1"
da.Fill(ds, "tbl1")
dgrv1.DataSource = ds.Tables("tbl1")
End Sub
End Class

dgrv1 is a datagridview that I use to display the data from my test
table in the Access mdb called Table1. I alias this table in the VB.Net
app as "tbl1" (for distinguishing purposes). If you want to read back a
specific row, just change the commandText in the select command like

Select * from Table1 Where ID = 5

You could also use a straight forward command object instead of a
dataAdapter, but the dataAdapter has a lot more methods/properties built
into it than the command object. It encapsulates more stuff - like
dealing with apostrophes, particularly in parameters.

Regards,
Rich
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