Referenced Object Has A Value Of 'Nothing'?
Oct 14, 2009
I am trying to get the value of a dropdownlist and post it to the viewstate and I am encountering this error: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 142: 'Mimick the DropDownList
Lin 143: Dim ddl As DropDownList = CType(ctrl, DropD
[code].....
When I place a breakpoint on that line and add a watch it says the value is "Referenced object has a value of 'Nothing'"How can I check for a value of nothing? I thought that is what the IsNothing was for. I have tried Convert.ToString() and still the same result.
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Jun 8, 2009
I have a dataview which I want to copy to another object that is not referenced by the original one.
What is the syntax to do this? The code below creates a new reference to the same object so I cannot modify one without modifying the other:
Dim filteredCategory As DataView
filteredCategory =
Me.ProductCategory
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Jan 16, 2011
I have an object array that I want to reference. The object array is in a deep set of classes so it takes class1.class2.class3.class4 just to get to it. I need to use this many times throughout my code so I figured I'd just create an object i.e. Dim Obj as Object and reference this array:
Dim Obj as Object = Class1.Class2.Class3.Class4.ObjectsArray
Problem is I can't resize the referenced array, by using the reference. The following does not work:
Redim Obj(5)
How come it isn't referencing my object array completely? is it because its the same object type?
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Mar 3, 2011
My VB console application uses
Imports Excel = Microsoft.Office.Interop.Excel
and runs just fine on my PC. When I copy my exe to a different system (WinServer 2000) and try to run the program it aborts with[code]...
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Sep 1, 2011
After reading through several forums, which suggested that I should add a referenced DLL (whose source cod I have) to solution as an added project, I am unable to step through the code of the referenced DLL that generates an error. I also turned off"Enable just my code" from Tools->Options-> Debugging. However, I am still not able to step into the referenced DLL's code I added the pdb file and the referenced dll to the bin/Debug folder of the original code that I am working on
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Aug 10, 2009
I created a standard exe project and then an Activex exe.I compiled the activex exe and tried to make a project reference to the activex exe and keep getting the error ... can not be referenced because its project type is exe
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Oct 15, 2009
I have a VB project that has a referenced to other project in the same Solution. I want to use Type.GetType() in order to obtain a type object from the referenced project but the method keeps returning Nothing.[code]...
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Oct 10, 2010
Is the any way I can embed a referenced .dll as an embedded resource? Basically so I just have 1 file on compiling, rather than a EXE and a .dll. I've tried ILMerge, but it doesn't support WPF assemblies.
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Oct 15, 2010
I have a third party referenced dll which I have set to 'copy local' in my project.
How can I make the location of that .dll not be in the same directory as the built exe, but in a folder called 'Resources' within that directory?
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Sep 16, 2010
If I try to call my extension method which is defined like this:
Module LinqExtensions
<System.Runtime.CompilerServices.Extension()> _
Public Function ToSortableBindingList(Of TSource)(ByVal source As IEnumerable(Of TSource))
[code].....
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Nov 13, 2009
As per [URL] How can I achieve this? 'processPacketVB' is a 'variable' but is used like a 'method' is the error I'm getting with these references to the project and class and function.
using VBProcessPacket;
namespace UIST {
public partial class FormActionMenu : Form {
private void timerDelay_Tick(object sender, EventArgs e) {
VBProcessPacket.ProcessRX processPacketVB = new VBProcessPacket.ProcessRX();
//read the receive buffer as a string
RXpacket = processPacketVB("test"); // processPacketVB throws the error 'processPacketVB' is a 'variable' but is used like a 'method'
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Apr 22, 2011
I have the following projects:
TradingProject (my code) Has reference to TradingLibrary, and to ApiLibrary?
TradingLibrary (my code) Has reference to ApiLibrary
ApiLibrary (3rd party code)
I'm making several projects (like TradingProject) that communicate with a software through use of an existing ApiLibrary. But I want to push generic methods into a library I write: TradingLibrary.
Still, I would like to use some parts of the ApiLibrary directly from TradingProject. However, I then would need to pass an object (of an ApiLibrary class) into a method in TradingLibrary. Where the object should be recognized. However I assume this will be a problem, as TradingLibrary use it's own reference to ApiLibrary, so it will not be recognized as the same classes? Is there some way I can "forward" the ApiLibrary reference from TradingLibrary to MyProject, such that they will use the same reference? Or do I need to duplicate the classes and inherit from ApiLibrary for each class? Like:
NameSpace TradingLibrary
Public Class SomeClass
Inherits ApiLibrary.SomeClass
End Class
I guess that would work, if I do it for all classes I need, but is there perhaps some simpler way I'm not aware of?
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Jun 16, 2009
I'm co-developing a vehicle information system that reads and presents data from a communication bus. Signaling information on the bus is stored on some kind of database (from the dark ages i'd guess) from which it's only possible to get data out of by extracting a xml-snapshot. Since that wasn't bad enough, someone in upper management thought it was a great idea to treat different parts of the system as different projects (it looked really nice in the organizational chart) which lead to more databases...It is now my responsibility to merge these xml-files into one and before I start banging my head against the wall i thought it would be a good idea to check with you geniuses if there's any neat solution to my problem.The structure of the xml is somewhat like this:
<data>
<frame ID="1001">
<attributes>
[code].....
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Nov 5, 2010
I have been using Excel in vb.net for years and no problem but I have a new app and nothing is working. First I can't get Microsoft.office.interop referenced anywhere, which was weird. Then I can't instantiate Excel App.. Dim pExcel_App as New Excel.Application -- this gives me error "New cannot be used on an interface??But I can do this..Dim pExcel_App As New Excel._ExcelApplication -- where did this come from?Then I can't put anything into cells Dim wkbSheet As Excel.Worksheet wkbSheet.Cells(1,1) = "Title" --- this give me an error "Expression is a value and therefore cannot be the target of an assignment"
THe really weird thing is that I have an old app open at the same time that is just fine with all this code. AND the intellisense is different for each cell.The good one sets is as a range, the bad one says it is an object???I re-installed the MS PIA's but this didn't help.
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Jan 12, 2011
I decided it was about time I learned about accessing Microsoft Office products via VB.NET. I started with Excel and it all worked fine, I could create a new Excel Application, open a workbook from file and read from the sheet then close it all down again no worries. However, when I turned to Word...things got strange. Using the code provided below, every time I run it an instance of Microsoft Word opens itself on the desktop (with no loaded content). I didn't have this problem when using Excel with similar code, so I have to ask..what gives? Is there a way I can stop MS word opening at all? At the moment it just flickers for a second (it opens when I open the document, then when I call the Quit method it shuts down a split second later)[code]...
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Jul 1, 2009
I would like to enumerate an assembly's referenced assemblies and determine what should or should not possibly be included as a dependency in deploy scenarios.For obvious reasons I would want to exclude those assemblies that would be included by the CLR install.Is there any way to track back an assembly to being part of the default install of the CLR?
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Mar 17, 2010
We have a large application that implements "scripting" (i.e, dynamically compiled user code that can include user-defined .dll references).
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Nov 4, 2009
I have a project which contains all custom controls and images; we'll call it projectBase.Now I have created a windows forms project (project1) that references projectBase. I need to access the embedded resource (images) of projectBase in project
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Dec 13, 2010
I am wanting to make a class that can be referenced in from other applications. In this class I simply want to do a showdialog to a form. That form has a ssrs pre-defined within it and a viewer all set to show the report. But when I try and define that action I get that my form is now declaired
Imports System
Imports System.Drawing
Imports System.Collections
[Code]......
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Apr 1, 2010
I have a Button and a Picturebox control on my mainform. How can i code the mainform so that when the start btton is clicked it displays the file "student.gif" on the picturebox. The picture is added as a refrence to the project..[code]
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Jun 2, 2011
Everything worked great this morning on my ASP project. Suddenly, I have 48 errors. Similar to the following:
Name 'pnlVars' is not declared
'txtPolicyNo' is not a member of 'LetterWriterASP.UW'
Seems every control I reference is now no longer declared or not a member of my project. I checked the page, the controls are all there with the same names & IDs.
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Jul 8, 2010
I've been using the following method to store the primary key value of whatever record is being referenced. I would then call the Content.Id method to retrieve that value for sql commands.
My question is - is this good practice? One other told me I should make a session item instead.
This is my ContentDA class
Public Shared Property Id() As Integer
Get
Return _ContentId
[Code].....
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Aug 6, 2009
I got warnings on my project, does somebody know how to reference this assembly. this is probably because the project has these crm.mytextbox type textboxes and other controls instead of normal system.windows.forms.textbox.Warning1Could not find type 'crm.Mycombox'. Please make sure that the assembly that contains this type is referenced.If this type is a part of your development project, make sure that the project has been successfully built.00
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Jun 12, 2012
Recently I've found how to add a link to an item in Visual Studio so that you can reference common or shared files between projects. Editing the original propagates the changes to the projects where the file is referenced. But you can also edit the reference item and the changes are reflected in the original file, is there a way to prevent this behavior?
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Mar 20, 2009
I develop an application through two multi project solutions.There is one solution for the data layer stuff and another one for the front end stuff.All the dlls are referenced in a startup project and have copy local = true. So the build output from the GUI solution and the dlls referenced from the data layer solution should be copied to this startup project's bin folder. This seemed to work without issue for some time, but after changing source control, after a rebuild of the data layer solution, I clean the GUI solution and get the following output: [code] I have researched this problem and it seems microsoft are aware of a problem, logged under MSB3061... but no solutions have been posted by MS. Several users have suggested stopping the indexing service from indexing bin and obj folders (I've done this). I've also ensured that none of the bin/obj folders are under source control. I downloaded FileMon from sysinternals and it says that devenv (GUI) has the file locks.
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Jul 1, 2010
Is it possible to access the My.Settings of an other DLL referenced in the current Project? I have a Database project in which Settings the ConnectionString is stored. I need access to this Setting in an other Project(for Log-File).
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Mar 7, 2011
I have a .NET customer framework that functions much like a Workflow. It uses reflection to get a listing of all of the processes it is capable of from a specific folder, and starts them via reflection with a known start point (all of them have a method called "Process"). Since these files are only called to do the processing and not part of the compile... is there a way for me to be able to drop in a new reference library (DLL) for one of the processes that is being updated without restarting the whole process?[code]...
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May 12, 2009
I am attempting to move a highly referenced class from one namespace to another. Simply moving the file into the new project which has a different root namespace results in over 1100 errors throughout my solution.Some references to the class involve fully qualified namescape referencing and others involve the importing of the namespace.
I have tried using a refactoring tool (Refactor Pro) to rename the namespace, in the hope all references to the class would change, but this resulted in the aforementioned problem.Anyone have ideas of how to tackle this challenge without needing to drill into every file manually and changing the fully qualified namespace or importing the new one if it doesn't exist already?
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Mar 2, 2008
I have a self referenced table it contains Employee information, an employee reports to another employee, I've done this by including a field named ReportsTo as a foreign key that would be filled with the primary key. My first question is when using a strongly typed dataset how would I insert the first record without raising an error. the only solution that I could come up with is to insert an employee with the name NoOne and reports to himself i.e the employee number is the same as ReportsTo, this solution would be hardcoded in my program and only works when there is no records in the table. This is ok as long as I don't delete every employee from the table and try to insert new employees, in this case my insert will fail because the NoOne employee number is "1" and this would violate the index. this case calls for reseting the index each time I delete all the employees.
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Feb 19, 2009
We have a VB project that loads a reference to a .Net dll (which we also make). Both projects are being simultaneously developed.
When we add new classes to the referenced dll, the main project normally fails to notice the changes.
That is, if we added a new class Bar to the Foo dll, we should be able to type "Foo." and have Bar listed in the intellisense dropdown. It's never there.
Removing the reference and then adding it back in again sometimes fixes the problem. Sometimes we have been able to just manually type Bar in and then rebuild without errors.
It seems to me that there should be some way to tell Visual Studio to reload the referenced project because it has changed. Actually, I think VS should notice the change itself, but failing that, we need a simple way to force a reload.
Edit: It is VS2005 and we are referencing output assemblies (the dll)
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