My problem is I'm am trying to connect to a db2 table but no matter which connection type is use (adodb, oledb, db2) I keep getting the same error message when I get to this statement: objConn = New (adodb, oledb, db2).connection. "Property evaluation Failed".
View 7 Replies
I'm passing a collection of links to a background worker. The first time I use it in my bgw, it works fine, the second time (after a thread sleep) it says property evaluation failed.
View 1 RepliesI am using the code below to export records in a datatable to an excel file using EPPlus.
Dim excelPackage = New ExcelPackage
Dim excelWorksheet = excelPackage.Workbook.Worksheets.Add("DemoPage")
excelWorksheet.Cells("A1").LoadFromDataTable(dt, True)[code]....
However, after walking through the code block, at Response.End(), I get an exception {Property evaluation failed.}
Update:
The error log is:
ERROR: System.Threading.ThreadAbortException: Thread was being aborted.
at System.Threading.Thread.AbortInternal()
at System.Threading.Thread.Abort(Object stateInfo)
at System.Web.HttpResponse.End()
at Reporting.Page_Load(Object sender, EventArgs e) in C:Reporting.aspx.vb:line 38
I upgraded a working VB.net windows application from VS2008 to VS2010 (a fairly simple form to process some data) and I get 15 warnings "Load of property 'X' failed" where 'X' refers to what looks like system variables like OutputType, StartObject, RootNamespace, AssemblyName, Option Explicit and so on. I also get two errors pointing to the Form1.Designer.vb file which I is the DesignerGenerated file saying that "My' is not a member of '<Default>'Originally I just used the upgrade wizard, resulting in these warnings. Next I tried creating a new project and adding the relevant files using the VS "Add Existing" function. I have also looked for answers in the forum and on-line but found none. This has got to be something simple I am overlooking.
View 4 RepliesThe property on the error message is a List(Of Person) and for some reason it trigger this error, for almost anything I do, and its getting really annoying.
View 2 RepliesI'm maintaining a set of code that has a wrapper class for SqlDataAdapter to load a System.Data.DataTable. It has a generic function to determine if the DataTable "hasRecords". I know it's a minor issue, but out of curiosity... Which is the faster method to use?
Existing:
Public ReadOnly Property hasRecords() As Boolean
Get
hasRecords = CBool((CBool(BOF = True) And CBool(EOF = True)) = False)
[code]....
If RecordCount is defined as a fixed value in as a recordset property I would think the count would be faster as a single eval vs the multipart conversion/eval BOF/EOF method it is using.
how to clean up the code, perhaps some recommendations on how to have it working optimally. Maybe even some links for areas in particular that I should be more aware of. What functionality have I not employed here that I should have?
Option Strict On
Imports System.Data.SqlClient
Public Class Expenses
Private MotorItems As New List(Of String)
[code].....
When i click on my installed VB.net application icon on the desktop,i receive the message : 'Application failed ti initialize property ox700000000000000 ..... click ok to terminate application'.
View 2 RepliesThis is a bit of an odd one. Last week, this code worked as expected. This week, it does not. Example:
[Code]...
We had a Nullable object must have a value error today on this line of code:list = From x In Me Where x.FooDate.HasValue AndAlso x.FooDate.Value.Date >= barDate
Funny thing is that I feel sure this used to work fine (and there has always been a sprinkling of null values in the underlying data). And logically it looks fine to me. The check for HasValue and the AndAlso look as if they're going to shield us from any Null danger.But it seems suddenly they're not. Am I missing something?OK, we can correct it to this, which eliminates the error:
list = From x In Me Where If(x.FooDate.HasValue, x.FooDate.Value.Date >= barDate,False)
But this looks to me less readable. In simplifying the above code to shorten the line I left out a crucial chunk of the code. The original problem should have read something like:
list = From x In Me Where x.FooDate.HasValue AndAlso x.FooDate.Value.Date >= fromDate And x.FooDate.Value.Date <= toDate
Because of the rules of shortcircuiting and operator precedence (as outlined in an answer to a long ago question of my own) I needed to add brackets round the second part of the instruction in order to stop LINQ evaluating the second x.FooDate.Value.Date:
list = From x In Me Where x.FooDate.HasValue AndAlso (x.FooDate.Value.Date >= fromDate and x.FooDate.Value.Date <= toDate) LINQ really does obey AndAlso and force me to look more closely at the original problem.
I have a system created last year called the "Faculty Performance Evaluation System" in which the students will evaluate their instructors according to their performance. Now I'm trying to change that and the questions are to be loaded from the database. Here are my options for displaying the questions and the rating stars:
1. Using lots of labels placed in the form as well as images(stars)But this will consume lots and lots of codes and the number of questions is limited. Also, I can't do a control array in vb.net unlike in vb6 so it will be very long...
2. Using listview/datagrid?- is it possible to create this project with a listview containing the stars in the 2nd-6th column?, If so, how?
(It's ok to lose my background but the stars can't. Since using this kind of control will make my number of questions unlimited)- then, if I'm to choose this option, how would I save the results into my database? (fields: studnum, category, quesnum, rating)
I'm using Visual Basic Express 2010 and SQL Express 2008 in Windows XP. At first I couldn't add a datasource (the .mdf file for the database) because of a "Operating system error 32" which I seemed to have resolved by giving myself full permissions for .mdf file (by right clicking on the file and going into properties and then Security) and restarting the SQL SERVER (SQLEXPRESS) service. The dataset for the database is in my solution explorer but when I right click on a table adapter to add a query and attempt to open up the query builder, I get the error in the title above.
View 1 RepliesI have a listbox with several list items added. I want that as user click on an item, I should be able to show its property. This should change for different items. For example (hypothetical) : Listbox has numbers 1 - 10. Now when I select 1 I should be able to set property - Name, Lastname, Colour, Age.
When I select 2 I should be able to set - Age, Hair Colour (clr shows), Weight, Date. When I select 3 then - City (combo box drop down), Country, Age only. This way value changes for diff items. One way is to put them in property grid and show them. Though this looks nice but adding/removing items in that is not easy. You need to have a class that refer that to prop grid. Do I have to code for each classes for all values in listbox or is there an easier way to manage items in property grid. If you think prop grid is not the right tool for such an activity then can you suggest something else.
I'm using Visual Basic Express 2010 and SQL Express 2008 in Windows XP.I created a database on my local PC HDD. At first I couldn't add a datasource (the .mdf file for the database) because of a "Operating system error 32" which I seemed to have resolved by giving myself full permissions for .mdf file (by right clicking on the file and going into properties and then Security) and restarting the SQL SERVER (SQLEXPRESS) service.The dataset for the database is in my solution explorer but when I right click on a table adapter to add a query and attempt to open up the query builder, I get the error in the title above.
View 10 RepliesI created a typed dataset a day or so ago, then I added a whole bunch of tableadapter/tables with some relationships etc... suddenly out of nowhere it decides my dataset "is not defined". everywhere in my code where i use this dataset now has an error. I tried not to pull out my hair and do a Clean then Rebuild solution... out of nowhere it just refuses to generate code. Object reference not set to an instance of an Object. It would be nice if it was my object so i could find it but it's not.
Curiously I also lost the little database icon on the dataset in the solution explorer.I can still open it in the designer and preview my queries etc... it just wont make the code. it's driving me insane. anyone got a solution?
Is there a way to detect if a My.Computer.FileSystem.CopyDirectory() has failed? It seems that if it fails the copy (i.e., not even space on the destination drive), it just quits and doesn't seem to throw me an error? I already have it in a Try/Catch block, but I'm using that to see if the source directory exists, I'm guessing I should use
[Code]...
I got a simple error for establishing a connection.The database is 'Nwind.mdb'.The code is very small, I know that it is a username issue. The default user is "Admin". The error is "Login failed for user '' after I clicking a button.
Imports System.Data.SqlClient
Imports System.Data.OleDb
Imports System.Data.Odbc
[code].....
ode if I/m wrong i cannot save my file im using sql server 2005
Imports System.Data.SqlClient
Public Class Form1
Private cs As New SqlConnection("Data Source=GSM-DB6CB13C69E;Initial
[code].....
I am currently writing a custom control, for a future project. The control uses custom cursors, but sometimes this strange error appears: Code generation for property 'Cursor' failed. Error was 'CursorConverter' is unable to convert 'System.Windows.Forms.Cursor' to 'System.ComponentModel.Design.Serialization.InstanceDescriptor'.
[Code]...
I just lost 1/2 hour of work when VB IDE suddenly lock up in a loop. I thought no big deal, I have it setup to autosave every 3 mins. It would have backup up at least 10 times. Killed VS via task manager. Brought VS backup. Went into my project and I am back where I was 1/2 hour ago.Is there a way I can still recover my work so that when this happens in the future I can recover lost work?
View 4 RepliesI am running Visual Studio 2008 on Vista Premium sp1, and when i'm trying to add to a form :COM Component "Microsoft Spreadsheet .." then i get this error:
< Failed to create component 'AxHost'. The error message follows:
'System.AccessViolationException: Attempted to read or write protected memory. this is often an indication that other memory is corrupt.
at System.Windows.forms.design.documentdesigner.axtoolboxitem.createcomponentscore(idesignerhost host)
at system.drawing.design.toolboxitem.createcomponentscore(idesignerhost host, idictionary default values)
at system.windows.forms.design.oledragdrophandler.createtool(toolboxitem tool, control parent, int32 x, int32 y, int32 width, int32 height,
boolean haslocation, boolean hassize, toolboxsnapdragdropeventargs e)' >
I have this code in my class file:
Dim f As Font = New Font(Font, IIf(m_Selected And m_FontBoldOnSelect, FontStyle.Bold, FontStyle.Regular))
And says
Overload resolution failed because no accessible 'New' can be called with these arguments:
'Public Sub New(familyName As String, emSize As Single)': Value of type 'System.Drawing.Font' cannot be converted to 'String'.
'Public Sub New(familyName As String, emSize As Single)': Option Strict On disallows implicit conversions from 'Object' to 'Single'.
[Code] .....
Error:
Option Strict On disallows late binding.
and then some
pnlBottom.Height = Me.Height - (pnlTop.Height + IIf(m_TopSeparator, 2, 0))
Error:
Option Strict On prohibits operands of type Object for operator '+'.
I am getting two errors
1) Cannot publish because a project failed to build.
2) An error occurred while signing: SignTool.exe not found.
Regarding #1, I can manually build and rebuild the application without error. I only get this error when I try to Publish.
Regarding #2, I looked in my SDKv3.5Bin directory and indeed the signtool was not there. In fact I only had 3 files (genasm.exe, genasm.exe.config, and hidpi.res). I copied the signtool.exe from the Visual Studio 2005, (file dated 10/26/2006), but I still get the same error saying it can not find the file.
I'm currently upgrading my sql server from 2005 to 2008 enterprise server. I used VB to connect to the database. It worked fine in the previous version of sql, but when upgrading it seems doesn't recognize my connection string.
Below is my connection string:
myConnection = New SqlConnection("server=RAVY-PCRAVY;uid=;pwd=;database=CIEDC");
myConnection.Open();
Where Ravy-PCRAVY is my server name at the sql server login dialogue box. And I used the windows authentication mode.
I am getting an error - "Failed to convert parameter value from a String to a Int32"
Background Information:
Table: Customer
Fields: CustomerID, Title, Forename, surname, street, town, country, postal code, home phone, mobile phone, work phone, email.
All the data types in this are Strings with the exception of CustomerID.
Table: Country
Fields: CountryID, Country
CountryID = Integer, Country = String
There is a relationship between country.country and customer.country. I have made country a combo box with the contents of country inside it. This problem is resolved if I remove country as an input - but I need it in!
VS 2008 Failed to create InternetFavorites.snk Access is denied?
View 8 RepliesVS 2008 Multi Thread Overload resolution failed
View 10 Replieswhen saving the "conversion failed when converting datetime from character string" is displayed.
Private Sub BtnSave_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnSave.Click
Try
Dim cn As New SqlConnection(ConnectionString)
cn.Open()
[code]....
Suddenly today , when I started my computer and went on to open the VS , I got this strange message: Do you know what it might mean ? I didn't installed anything on my PC for a long time, so I can't think of anything ...
View 8 Replieserror details :"IErrorInfo.GetDescription failed with E_FAIL(0x80004005)."on googling i found that it is b'cse of key word
Private Sub Butn1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim CrewCri As String = Replace(Me.cbo_enroll.Text, "'", "")
Dim ExPeriOd As Integer = Me.cbo_extractlimiter.Text
Dim socT As String = Me.cbo_sections.Text
[code]....
