Hey there,
I am totally disappointed after I tried several days to get off this problem. This happens sometimes in following case: I am using [VS 2010 - 10.0.40219.1 SP1Rel + some Hotfixes on a WIN7 System] I have a combobox which will be filled and filtered by Usernames which are read from a datatable -> dataview. The datatable is filled before I work in the combobox (see fill_UserTable()). In the beginning the combobox is empty. After I entered the first character the dataview is filtered so the dropdownlist only shows names beginning with this character. And the next character - new filter so the amount of the listitems get less. It also works into the other direction (growing amount of listitems). Here is the code which handles combobox textchanged: Dim dt_GlobalUser As New DataTable("dt_GlobalUser") Dim filteredGlobalUserView As DataView = New DataView(dt_GlobalUser) Dim m_userText As String = "" Private Sub fill_UserTable() 'fill dt_GlobalUser, if empty Dim counter As Integer = dt_GlobalUser.Rows.Count If (counter = 0) Then 'ToDo: only Names from a specific department Dim fbs As String = RegUserFBSplit() 'filling and counting with this routine counter = get_RowCount(dt_GlobalUser, fbs) End If End Sub Private Sub cob_GlobalUser_TextChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles cob_UserName1.TextChanged, cob_UserName2.TextChanged If (sender.Equals(CType(cob_UserName1, ComboBox))) Then Call check_COB_TextChanged(cob_UserName1) If (sender.Equals(CType(cob_UserName2, ComboBox))) Then Call check_COB_TextChanged(cob_UserName2) End Sub Private Sub check_COB_TextChanged(ByRef selectedCOB As ComboBox) Try Dim i As Integer = 0 Dim uName As String = "" If (m_userText <> "") Then If (selectedCOB.Text = "System.Data.DataRowView") Then selectedCOB.Text = m_userText End If End If uName = selectedCOB.Text 'in case it's not filled Call fill_UserTable() If (uName.Length > 0) Then filteredGlobalUserView.RowFilter = "User_Name like '" & uName & "%'" filteredGlobalUserView.Sort = "User_Name ASC" m_userText = uName 'after setting of datasource it calls again this routine with selected text System.Data.DataRowView selectedCOB.DataSource = filteredGlobalUserView selectedCOB.DisplayMember = "User_Name" selectedCOB.ValueMember = "USER_ALIAS" 'two comboboxes different behavior Select Case TabPage.Name Case "tp_1" selectedCOB.Text = uName selectedCOB.SelectionStart = selectedCOB.Text.Length Case "tp_2" If (selectedCOB.Items.Count > 0) Then selectedCOB.Text = uName selectedCOB.SelectionStart = selectedCOB.Text.Length End If End Select Else filteredGlobalUserView.RowFilter = "User_Name = ''" filteredGlobalUserView.Sort = "User_Name ASC" m_userText = "" selectedCOB.DataSource = filteredGlobalUserView selectedCOB.DisplayMember = "User_Name" selectedCOB.ValueMember = "USER_ALIAS" selectedCOB.Text = "" End If Catch ex As AccessViolationException My.Application.CRETURN.debug_print("cob_GlobalUser_TextChanged_AV_Ex", ex.Message) Catch ex As System.IndexOutOfRangeException My.Application.CRETURN.debug_print("cob_GlobalUser_TextChanged_IOR_Ex", ex.Message) Catch ex As Exception My.Application.CRETURN.debug_print("cob_GlobalUser_TextChanged_Ex", ex.Message) End Try End Sub I can not catch this error in the routine, it happens elsewhere. Errormessage from the stack.trace is here: System.AccessViolationException was not handled. Message=Attempted to read or write protected memory. This is often an indication that other memory is corrupt. Source=System.Windows.Forms StackTrace: bei System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg) bei System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData) bei System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context) bei System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context) bei System.Windows.Forms.Application.Run(ApplicationContext context) bei Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.OnRun() bei Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.DoApplicationModel() bei Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.Run(String[] commandLine) bei FEAS.My.MyApplication.Main(String[] Args) in 17d14f5c-a337-4978-8281-53493378c1071.vb:Zeile 81. bei System.AppDomain._nExecuteAssembly(Assembly assembly, String[] args) bei System.AppDomain.nExecuteAssembly(Assembly assembly, String[] args) bei System.Runtime.Hosting.ManifestRunner.Run(Boolean checkAptModel) bei System.Runtime.Hosting.ManifestRunner.ExecuteAsAssembly() bei System.Runtime.Hosting.ApplicationActivator.CreateInstance(ActivationContext activationContext, String[] activationCustomData) bei System.Runtime.Hosting.ApplicationActivator.CreateInstance(ActivationContext activationContext) bei System.Activator.CreateInstance(ActivationContext activationContext) bei Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssemblyDebugInZone() bei System.Threading.ThreadHelper.ThreadStart_Context(Object state) bei System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) bei System.Threading.ThreadHelper.ThreadStart() InnerException: Does anybody know why this happens? 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