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Exception when WorkflowInstance.TryUnload()

Posted By:      Posted Date: August 29, 2010    Points: 0   Category :WPF
Hi, I'm getting following exception when execute the WorkflowInstance.TryUnload() method. Type 'System.Data.Linq.ChangeTracker+StandardChangeTracker' in Assembly 'System.Data.Linq, Version=, Culture=neutral, PublicKeyToken=b77a5c561934e089' is not marked as serializable. Here I have enabled SQL persistence service as well. Greatly appriciate any solution for this issue. Thanks  

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I'm pretty excited to see that there is some real error handling for T-SQL code in SQL Server 2005. It's pretty painful to have your wonderfully architected .NET solution tainted by less-than-VBScript error handling for stored procedures in the database. The big difference being the addition of TRY..CATCH blocks. Let's take a look:

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Hi Folks,


i am trying to use tyhe exception handling block of Enterprise library 4.1.


I just createda polisy and used IndexOutOfRangeException and added a replace handler and a logging handler to it.

I am using the NotifyRethrow PostHandlingAction to the exception.


During runtime I am getting an exception on the HandleException event, The exception is added below:



Object reference not set to an instance of an object.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error:

Line 42:             catch (Exception ex)
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Line 45:         

userprincipal.changepassword throws exception


Hi all,

      userprincipal.changepassword(oldpassword, newpassword);

gives error: that is Configuration information could not be read from the domain controller, either because the machine is unavailable, or access has been denied. (Exception from HRESULT: 0x80070547)

but userDirectoryEntry.invoke("ChangePassword", new object[] { oldpassword, newpassword });

      userDirectoryEntry.CommitChanges works fine.

Any one please tell me the reason behind this.

active directory exception unusual behaviour


i have a small problem
i want user names from active directory for an auto completer type of service
the method is always throwing an exception 
"searcher.FindAll()' threw an exception of type 'System.DirectoryServices.DirectoryServicesCOMException' System.DirectoryServices.SearchResultCollection 

"Exception from HRESULT: 0x800AC472"


Am Exporting Data in to Excel File,meanwhile if i open any other Excel file than the excel File on which am exporting data gets opened up Automatically having name Book1.How should i stop these excel file not to get open.In the Error log i get an error message showing " Exception from HRESULT: 0x800AC472" . Need help on these.Thanks in Advance.

WebControls.TableRow throws exception on Add()


I have the following method to strip hidden and user-specified columns from a gridviewrow and return a tablerow. 

    Private Shared Function StripHiddenColumns(ByVal gvRow As GridViewRow, ByVal ColumnsToExclude() As Integer) As TableRow

        Dim row As New TableRow
        Dim i As Integer = 0
            For Each cell As TableCell In gvRow.Cells
                If cell.Visible Then
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                End If
                i += 1

            Return row
        Catch ex As Exception
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        End Try
    End Function

However, when I run this code and hit the Add method for the TableRow,  I get an InvalidOperationException stating the Collection was modified; enumeration operation may not execute.  I've gotten this exception before, but usually it's because I'm attempting to modify a table that is databound.  This particular one is not, i am creating it.  Can anyone offer any insight? 

Thanks in advance.


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