ObjectDisposedException

Question

Hi, 

 

I got randomly Object disposed exception in my application 1 out of 5 times if I ran the program. It does not throw exceptions every time i ran the program. 

 

stacktrace says the exception is occured at the line where file1 = nothing.

 

How do i solve this erratick behaviour ?

 

Better way to implemt the code?  

 

Dim sbSQL As New StringBuilder

sbSQL.Append("SELECT Item_Id from MyTableA")

Dim ds1 As New DataSet

Using daFindOutdated As New SqlDataAdapter(sbSQL.ToString, cn)

daFindOutdated.Fill(ds1)

End Using

Dim sbPath As New StringBuilder

For Each row As DataRow In ds1.Tables(0).Rows

sbPath.Append(ConfigurationManager.AppSettings("ZipFilePath") & "TBL" & row.Item("Item_ID").ToString.PadLeft(5, "0") & ".zip")

If File.Exists(sbPath.ToString) Then

Dim zip As New ZipArchive(New DiskFile(sbPath.ToString))

Dim folder1 As AbstractFolder = zip.GetFolder("\Item\File\")

Dim file1 As AbstractFile = folder1.GetFile("Tbl.cpf")

Using sw1 As New StreamWriter(file1.OpenWrite(True))

sw1.AutoFlush = True

sw1.WriteLine("")

sw1.Close()

file1 = Nothing

End Using

Dim folder2 As AbstractFolder = zip.GetFolder("\Item\File\")

Dim file2 As AbstractFile = folder2.GetFile("Tbl.cmp")

Using sw2 As New StreamWriter(file2.OpenWrite(True))

sw2.AutoFlush = True

sw2.WriteLine("")

sw2.Close()

file2 = Nothing

End Using

Dim folder3 As AbstractFolder = zip.GetFolder("\Item\File\")

Dim file3 As AbstractFile = folder3.GetFile("Tbl.upc")

Using sw3 As New StreamWriter(file3.OpenWrite(True))

sw3.AutoFlush = True

sw3.WriteLine("")

sw3.Close()

file3 = Nothing

End Using

zip = Nothing

End If

sbPath.Length = 0

Next

 

Answer 1

this is usually means one of two things:

1. There is some very unusual code path which, when taken, always causes a crash
2. A race condition exists between threads in your program. Thus, the crash appears unpredictably and may be difficult to reproduce

My advice to you is to start the program in the debugger, and leave it running until the exception is thrown. Then you can come back here and provide us with the relevant code, stack trace, debug output, etc.