oleDbexception was unhandled

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Hi, I have a problem with my coding. The error which i got is oleDbException was unhandled. Here I am developing function use to subtract number in database based on user input. I don't know how to solve this error , Please help me to correct my coding here. I also highlight the line causing an error

VB

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
         
        'open db connection'
        Dim Con As New OleDb.OleDbConnection("Provider=SQLOLEDB ;Data Source=Danawa;Initial Catalog=Store;Integrated Security=SSPI ")
        Try
            Con.Open()
        Catch ex As InvalidOperationException
            MsgBox(ex.Message)
        End Try


        'start transaction'
        Dim Trans = Con.BeginTransaction

        'define a sql command statement'
        Dim cmd As New OleDb.OleDbCommand("UPDATE ItemIn SET Itemquantity= Itemquantity - @IQ  WHERE ItemName=@IN", Con, Trans)
        cmd.Parameters.AddWithValue("@IQ", Int32.Parse(ItemquantityTextBox.Text))
        cmd.Parameters.AddWithValue("@IN", ItemNameComboBox.Text)
        
        'execute the command'
         cmd.ExecuteNonQuery()  // The probleam are from here//      
         Trans.Commit()
        Con.Close()
End Sub

Posted 11-Oct-11 17:23pm

Iswandi Abdul Rahman

Updated 11-Oct-11 17:36pm

Prerak Patel

v3

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Prerak Patel 11-Oct-11 23:37pm

Use code blocks.

Prerak Patel 11-Oct-11 23:38pm

I would suggest to write that part in try catch, and check the exception details.

2 solutions

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Al Moje · Answer 1 · 2011-10-11T17:46:00

Hi,

Try this:

VB

  'open db connection'
  Dim Con As New OleDb.OleDbConnection("Provider=SQLOLEDB ;Data Source=Danawa;Initial  Catalog=Store;Integrated Security=SSPI ")
  Dim trans As OleDb.OleDbTransaction
  trans = Con.BeginTransaction()
Try
  Con.Open()
  'define a sql command statement'
  Dim cmd As New OleDb.OleDbCommand("UPDATE ItemIn SET Itemquantity= Itemquantity - @IQ   WHERE ItemName=@IN", Con, Trans)
  cmd.Parameters.AddWithValue("@IQ", Int32.Parse(ItemquantityTextBox.Text))
  cmd.Parameters.AddWithValue("@IN", ItemNameComboBox.Text)
  'execute the command'
  cmd.ExecuteNonQuery() // The probleam are from here// 
  trans.Commit()
Catch
  trans.Rollback()
  Finally
   Con.Close()
   Con.Dispose()
End Try

Hope this could help...

Remember to vote, if help...

Regards,

Algem

Muhammad Shahid Farooq · Answer 2 · 2011-10-11T19:42:00

Solution 2

Use try catch in your code, after that you are able to find the exact problem.

I think you have no need to parse the text box value into int, because you are using parametrized query. Remove "Int32.Parse" and try it.

Posted 11-Oct-11 19:42pm

Muhammad Shahid Farooq