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ADO.Net SqlDataAdapter Update Command for Typed Dataset not working

Posted on 2007-03-29
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Last Modified: 2009-09-08
The table SecureNumbers contains a single row that holds fields storing the values for the next invoice number, next order number etc in an application.  I am using a typed dataset generated from a SQLDataAdapter MRMSecureNumbers to read and update the SecureNumbers table.

The problem is that, when I run the following code, the function increments correctly and returns the next invoice number but does not save the incremented invoice number back to the table.  

--------------------------------------------------------------------------------------------------------        

Dim ConnectionString As String = My.Settings.EnterpriseMRMConnectionString
Dim conn As New SqlConnection(ConnectionString)
conn.Open()
Dim TDS As MRMSecureNumbers = New MRMSecureNumbers
Dim daSecureNumbers As SqlDataAdapter
daSecureNumbers = New SqlDataAdapter("SELECT * FROM SecureNumbers "
, conn)
daSecureNumbers.Fill(TDS, "SecureNumbers")
Dim tdsRow As MRMSecureNumbers.SecureNumbersRow
Dim cmd As New SqlCommandBuilder(daSecureNumbers)
daSecureNumbers.UpdateCommand = cmd.GetUpdateCommand
tdsRow = TDS.SecureNumbers.Rows(0)
With tdsRow
        .BeginEdit()
        .Invoice += 1
        .EndEdit()
End With
TDS.AcceptChanges()
daSecureNumbers.Update(TDS, "SecureNumbers")
conn.Close()
Return tdsRow.Invoice

       
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Question by:ccravenbartle
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2 Comments
 
LVL 34

Accepted Solution

by:
Sancler earned 500 total points
ID: 18814448
These two lines are the wrong way round

TDS.AcceptChanges()
daSecureNumbers.Update(TDS, "SecureNumbers")

A dataadapter relies on the .RowState flags to know what has been altered and so needs updating.  .AcceptChanges cancels those flags.

Roger
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Author Comment

by:ccravenbartle
ID: 18814548
Excellent - worked a treat!  
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