VS 2008 ListBox.SelectedValue Causing Error
Mar 25, 2010
When my form is loading, it executes a Method called populateListBox().As the ListBox is populated, it inevitably triggers ListBox.SelectedIndexChanged, which triggers this
Private Sub lstLabels_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles lstLabels.SelectedIndexChanged
Try
buttonCheck()
Dim pathText As String
[Code]...
If I stick the Try...Catch in, allowing it to bypass the error, everything loads fine and when I double click an item in the ListBox, I have a MessageBox setup to show the SelectedValue, and it works fine (it shows a number like it should). Even if I put a MessageBox in the SelectedIndexChanged event, I still get the same error on the MessageBox line during the loading of the form.
Is this because the form is not fully loaded that I get this error? And what would be the proper way to handle this? I need this code in the SelectedIndexChanged for when the user selects a new item, so how do I keep this error from happening (or maybe even the event from triggering) during form load? Because I'm sure having a Try...Catch is not really an accepted form of "fixing" an exception; it's just ignoring it.
View 2 Replies
ADVERTISEMENT
Oct 11, 2011
I am currently programming a complicated inheritance structure for an Insurance Application. One DLL has classes that can be used and inherited from. DLL Two has Classes specific for our Auto Line of business, however when i attempt to use Object 2 from a Web Application it errors out because one of the classes is ambiguous because it appears that DLL Two inherits a class from DLL One which appears to pull in the entire inherited class. Since the Web app has a reference to both DLL One and Two, One has the class, Two seems to also have it and so compilation errors out with an ambiguous class in the same namespace.
To attempt to get more specific ill try a quick run down.DLL One - PGPolicy.dll contains standard classes with properties and methods needed for every line of business such as:
Policy, Name, NamedInsured, Unit
DLL Two - PGPolicyAuto.dll contains the following Auto specific classes:
Vehicle Inherits from Unit
Driver Inherits from Name
Since PGPolicy.dll contains classes needed by all lines of business and PGPolicyAuto.dll has more specific classes for the Auto line of business, the web application references both of them. The problem is that since Driver inherits the Name class, it appears to create a Name class in the same name space that the PGPolicy.dll has the namespace in, which gives me an Ambiguous class "Name" in the PG.Policy Namespace.
View 10 Replies
May 4, 2010
What I'm trying to do is build 16 forms dynamically at runtime (all will be identical). These 16 forms each will display a camera, which is using an ActiveX control made by a 3rd party. I am able to create the forms correctly and provide all necessary parameters for each control, but since I have to declare my own AddHandler event which checks if the camera connected, I need to somehow reference the ActiveX control at runtime, but I can't tell it which form it's on because it says it's not declared.[code]...
View 9 Replies
Feb 21, 2012
I have a project in VSTO/VB using a BackgroundWorker that works fine. It is a form that calls for a web page of information. The web page can take a while, so I have the form calling with the BackgroundWorker.I then have an Excel Addin project that has added the BackgroundWorker project. When I call up the form from the Excel Addin project and use the BackgroundWorker to request the web page, it grabs the web page ok. But the work done upon completion, during the BackgroundWorker1_RunWorkerCompleted method, is resulting in an error message:
View 2 Replies
Apr 23, 2009
I create an empty boolean array check_state(), and then if a condition is met later in the script, I redim it and save a list of check box states as booleans into the array, and later check the array values, but I can't work out how to do this without causing an error if the array was not defined to begin with
View 1 Replies
Oct 13, 2010
I am trying to develop a web application to populate data to three datagrids(datagrid control) using 2003 version, each datagrid has three columns and about 10,000 rows. The problem I got is it only allow load data once, whenever I changed the setting and reloaded data, the Page Can Not Be Displayed error will popout. I tried to remove one or two datagrids, it would allow populate data few more times, eventually will error out.
View 1 Replies
Apr 22, 2010
A developer has created a custom control in ASP.NET using VB.NET. The custom control uses a repeater. In certain scenarios, the rpt_ItemDataBound event is encountering a data error. My goal is rather than having the user see the yellow screen of death, give the user a friendlier error explaining exactly what the data error is. I figured I would be able to use a Try/Catch block as shown below throw the exception, however, it appears that the event has nowhere to be thrown to and stops executing at the "End Try" line.
Protected Sub rpt_ItemDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.RepeaterItemEventArgs) Handles rpt1.ItemDataBound, rpt2.ItemDataBound
Try
ProcessBadData...
Catch ex As Exception
Throw ex
End Try
End Sub
In VB.NET, I can find where the repeater's DataSource is being set, however, I can not find a DataBind event. How I can capture the exception in this ASCX control so I can report it to the user. The stack trace looks like this. There is another repeater within the repeater that is actually causing the error (rptOther) and I'm able to catch the error, but I can only throw it to the rpt_ItemDataBound. How rpt_ItemDataBound is getting called without a DataBind event.
at Company.WebForms.Control.rptOther_ItemDataBound(Object sender, RepeaterItemEventArgs e)
at System.Web.UI.WebControls.Repeater.OnItemDataBound(RepeaterItemEventArgs e)
at System.Web.UI.WebControls.Repeater.CreateItem(Int32 itemIndex, ListItemType itemType, Boolean dataBind, Object dataItem)
at System.Web.UI.WebControls.Repeater.CreateControlHierarchy(Boolean useDataSource)
at System.Web.UI.WebControls.Repeater.OnDataBinding(EventArgs e)
at System.Web.UI.WebControls.Repeater.DataBind()
at Company.WebForms.Control.rpt_ItemDataBound(Object sender, RepeaterItemEventArgs e)
View 1 Replies
Mar 15, 2012
I've been programming a game recently and didn't want to make 99 weapons manually. I've tried making a loop do this for me. I've got the loop working, everything is perfect. But when I run the program and list all the Weapon(x).Name [x being any value between 0 & 99] they are all identical... HOWEVER. If I single step through the code it lists all the names from 0 to 99 perfectly fine. Why is it that single stepping through it produces what I want?
Private Sub CreateWeaponList()
Dim StatName(4) As String 'Creating 4 pre-made names for weapons
Dim WeaponName(4), RandomWeaponName As String 'Creating 4 more pre-made names for weapons
For x = 0 To 32
Weapons(x).Type = "Sword"
[Code] .....
View 2 Replies
Jul 14, 2011
I have the following LINQ query:
Dim find_id = From p In dbContext.Residents _
Where p.person_name = occupant _
Select p
I then pull the first returned ID like so:
Dim building_id As String = find_building_id.FirstOrDefault.id
This works fine, except with the person has a ' in their last name, like M'arta. In this case I get a NullReferenceException.
Okay, the problem appears to be that when I am capturing the name initially from a GridView it is inserting into the value a #39 instead of ' and then LINQ is keeping things correct, so I end up with a non-match since it is attempting to match:
M#38arta = M'arta
View 1 Replies
Dec 13, 2011
I have a project in VB 2008 Express, and I made a foolish mistake of assigning a string setting (ie my.settings.mystring) a very long string (the contents of a 115kb text file). After that the compiler threw an error and closed the IDE, now everytime..I open the project to try and get rid of the string the IDE throws an error 'system out of storage...' (my laptop has 4GB memory, ~100GB free hdd space) and promptly closes.
View 3 Replies
Sep 23, 2011
when I clicked the send button it would work, but if you tried to hit enter it would just do a postback to the same page. Yesterday I thought I finally got it so it would work on chrome (it has been working just fine on firefox, but breaking on chrome/safari and it is an app for the iphone). But, even though I finally got it so it would change pages, it is now displaying an error. I narrowed down the cause to a postback that is being called right before the postback I want is being sent which is then cancelled. I assume the cancelled postback is blank because the problem I was having was the page would do a blank postback.[code]
View 2 Replies
Jan 14, 2009
I just do not understand the combo box theory when you need to define the selectedvalue in a datagridview combo box. anyone have a working example? JMC had a lot of definition in other posts but.. i just did not grasp it. This combo box is in DataGridView1
[Code]...
View 5 Replies
Jun 2, 2009
I have the following query that executes when my form loads. It's the rowsource for my combo box. The query is fine and populates the combo perfect, however, when i click into the combo box I cannot click out of it or even close the form. I have tried taking out the line of code that fills the form via table adapter on load and it works fine (opening the form unbound by the main table). Has anyone run into this before? I have another combo box on the form setup the exact same way and this is not happening. I've experimented with different datatypes etc....
code to populate combo box:
Public Shared Function LoadCallSource() As String
Dim sConnectionString As String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:Documents and Settingsdiw07My DocumentsDaily Backupsphone memo backend.mdb"
[code]....
If I take out the line
Me.MemoTableAdapter.Fill(Me.Table_Memo.Tables("Memo"), intMemoID)
The Combo boxes do not act up or "Lock"
View 4 Replies
Apr 20, 2009
I have a Linq-to-SQL class diagram in my web application containing the two tables in my database (held in a DBPro database project in the same solution). All was working fine yesterday. I start doing some work tonight and note that the solution compiles fine in Visual Studio, but when I run the web app I get a compilation error:
Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately.
Compiler Error Message: BC30002: Type 'FrostAlertDatabaseDataContext' is not defined.
[code]....
View 5 Replies
Feb 4, 2009
i want to set the current displayed item in combobox by combobox.selectedvalue = valuehere is the code
Combobox.selectedvalue = value
rivate Function populateComboSupplier(ByVal supplierID As Integer) As Boolean
Dim readSupp As New SupplierCRUD
[code].....
View 1 Replies
Jun 29, 2010
I'm trying to use a nested multi-line lambda Function in VB.NET and am getting an error. Here's what my code looks like:
cartItems = cartItems.Select(Function(ci) New With {.CartItem = ci, .Discount = discountItems.FirstOrDefault(Function(di) di.SKU = ci.SKU)})
.Select(Function(k)
If k.Discount Is Not Nothing Then
[code]....
View 2 Replies
May 19, 2010
My application requires a user to log in and allows them to edit a list of things. However, it seems that if the same user always logs in and out and edits the list, this user will run into a "System.Data.SqlClient.SqlException: Timeout expired." error. I've read a comment about it possibly caused by uncommitted transactions. And I do have one going in the application.
[Code]...
View 4 Replies
May 19, 2010
i'm trying to load a txt file into a listbox in this way
Dim FILE_NAME = OpenFileDialog1.FileName
Dim sr As StreamReader = File.OpenText(FILE_NAME)
Dim riga As String
riga = sr.ReadLine()readline
While riga Is Nothing
[Code]...
View 2 Replies
Sep 23, 2009
For the life of me i can't figure out why this is throwing a first chance exception error. The error I'm getting in the immediate window is
Quote:
A first chance exception of type 'System.ArgumentException' occurred in Microsoft.VisualBasic.dll
[code].....
View 7 Replies
Aug 21, 2009
Basically what happens is each time it loops through it adds a number to the end of the string, and by the end I should end up with an array full of string in a format like "111 222 333 444 555 666" but I end up getting strings like this "111 111 222 222 333 333". The weird thing is, if I add a message box in every loop it works fine, but obviously I don't want a message box pooping up every time it loops through. What is causing this and how might I fix it
The code is:
For x As Integer = 0 To (NumCards.Value - 1)
NumRep = 0
[code].....
View 3 Replies
Dec 27, 2010
I have a VB.NET WinForms application. While adding a new data source, it is giving "An item with the same already been added" on the Add Data Source wizard form.
The application does not contains any existing data source.
What could possibly be causing this error, and how might I go about resolving it?
View 1 Replies
Oct 1, 2011
I have a single user app that I wrote and have been using for more than a year that uses an Access 2003 database. Today, out of the blue, I started getting a DB concurrency violation whenever I tried to update one particular table in the database. After trying to troubleshoot what the problem might be, I just deleted that table and recreated it and the problem went away.
View 2 Replies
Jul 20, 2009
I'm using VB Express 2008 and MS SQL Express 2008. I have a couple of tables in my SQL database and among them are some log tables that track changes in the data entries of the substantive tables and fields I have. I have one log table fore each of the datatypes that appear in my substantive tables.
For example any change to any field in a substantive table where the field is of a bit type will be logged to the BitTypeLogTable. All of my log files are structured essentially the same. For example the structure for my BitTypeLogTable looks like this:
The other logs are identical except that the OrigValue and NewValue fields have different datatypes according to the datatype they are intended to track. For example the datatypes for those fields in the DatetimeTypeLog is datetime and in the MoneyTypeLog is money.
Each of the substantive tables in my database has three triggers which cause entries to be made to the log tables when the substantive fields are changed. For example, one of the UpdateTriggers looks like the following:
[Code]...
View 6 Replies
Feb 13, 2010
1 when my listbox returns resaults it only brings back 10 how do I set it to return lets say 500
and question 2 is when I click on my links in listbox it's not opening webpage as I would expect it...
This is my code
[Code]...
View 8 Replies
Jun 24, 2011
I need to get the selected value of a ComboBox in a DataGridView. I have it partially working, but I get a Null Reference Exception if I change a another ComboBox in the grid.[code]...
View 5 Replies
Apr 7, 2009
I read a lot topic in this forum about how to set a SelectedValue in aDataGridViewComboBoxColumn but nothing was useful for me. I dont know why, maaybe I dont know understand the problem.ets see: I have a DataGridView where one column is a DataGridViewComboboxColum. filled it. know read the selectedIndex with a EventHandelr and one Delegate created in the DataGridView EditingControlShowing event.This is the class with I Fill the DataSet for the ComboBox.
Public Class Expample1
Private code As String
Private name As String
[code].....
View 2 Replies
Jul 20, 2009
What is the meaning of 'selected value' in combobox properties?
I create a combobox with valuemember = ID (primary key, autonumber) and displaymember = name. How do I get it to select the row with ID of 10, for example?
[code]...
View 2 Replies
Dec 9, 2010
Is this possible? I programatically change the selected index when a certain event is fired using this code:
DropDownList.SelectedIndex = DropDownList.SelectedIndex + 1
Now I want to update a corresponding textbox with the text that is in the new SelectedIndex of the DropDownList via postback.What's the easiest way to do this?I know how I can do this in javascript.... I was just wondering if i could do this in the VB code behind.
View 1 Replies
Feb 4, 2011
I have a dropdownlist that is populated by a webservice using the ajax cascading dropdown. I have not been able to set the selected value using javascript. It appears that the values do not exist when the javascript runs. I placed the javascript at the bottom of the aspx page. Here is all of the code and the javascript I have tried.
<asp:DropDownList ID="ddlBusinessArea" runat="server"></asp:DropDownList>
<cc1:CascadingDropDown ID="CascadingDropDown1" runat="server" TargetControlID="ddlBusinessArea"
[Code]....
View 1 Replies
May 3, 2010
I'm using VB 2008. I'm looking for a way to take the value of the combobox after the user selects the right one. The combobox is databound and in List mode allowing selection of only the items in the box. I allow autocomplete by setting:
AutoCompleteMode = SuggestAppend
AutoCompleteSource=ListItems
So the user can key in the right value and the value narrows down each time. The user can press enter or just click somewhere else to select the value. I need a way to display the value of the combo after the selection is made but not each time a user presses an additional key to narrow down the selection.
View 12 Replies
