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?
I'm having problem regarding session items. Before I use them, I want to check if they exists, but using this codes gives me error:[code]I think Session("SomeSessionItem") tries to acquire the value of the session item. If the item doesn't exists then it throws exception. But how do I check if a session item exists before using them? I have a page Home.aspx.In the Home.aspx.vb, I instantiate a WebUserControl SomeControl.ascx. Note that in Home.aspx.vb event handler Page_Load I can use a condition to check session without getting an exception.Inside SomeControl.ascx.vb I'm trying to access the session, here's where the exception occurs.
View 5 RepliesI'm trying to connect a VB application (2010) to an MS Access DB by adding a data source from the data menu but I receive this error message "The connection you selected uses a local data file that is not in the current project.Would you like to copy the file to your project and modify the connection ?
If you copy the data file to your project, it will be copied to the project's output directory each time you run the application" and the options are (yes , No , Help)
If I choose Yes I will not be able to make the application 'device independent ' since it will not be copied under the bin , and if I choose No , changes won't be applied to the DB
Iam try addingnew data source by using the Wizard but it gives me massage error (unexpected error has occured)
View 11 RepliesWe are trying to implement Source Control with Visual SVN, Tourtoise, and Ankh. All works well once a project is placed in the repository. But, when you try to open a project stored on your local client, that is not stored in the repository, Visual Studio freezes up. (VS2008)
View 1 RepliesWe are trying to implement Source Control with Visual SVN, Tourtoise, and Ankh. All works well once a project is placed in the repository. But, when you try to open a project stored on your local client, that is not stored in the repository, Visual Studio freeze
View 7 RepliesMy 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]...
I am wondering if anyone else has experienced any issues with adding a data source to a VB.NET 2010 solution using the 'Add New Data Source' wizard. I am getting a very odd behavior when i add the data source, I see a .xsd file is added in my solution explorer but I do not get a data source listed in the data source view. In short, it will add a dataset to the project but will not add an entry in the project data sources. I realize I can code to get the same results but purely out of convenience I would much prefer to just use the wizard and the corresponding table adapters it generates as I always did.
By the way, a google search shows that many people had similar issues in the 2005 version but their issues involved trying to use special characters in the project path (i.e. 'C:My ProjectsR & DMy Tool. I do not use any special characters in my project paths and yet am still experiencing this issue.
am developing a point of sale program for a project subject. The trouble im having is when i press on the button to add the item from a textbox to a listview i receive an error: See attached Screenshot.
my code is:
Private Sub SalesScreen_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Me.CustomerTextBox.Text = "Cash Customer"
[Code].....
I will start off here by asking the question. How do I make the data from a database be bound to my project? I keep trying to add a new data source so that I can drag and drop things to my form, but I am unable to. I follow the steps, choosing an OLE DB, the file's location (D:Data Connected Applicationsfile name) The conecting string looks like: Provider=Microsoft.ACE.OLEDB.12.0;Data Source="D:Data Connected ApplicationsItem_Database_A.accdb". I choose the objects that I want (In this case, the entire tables option) and then it returns a message to me stating that: An error occurred while creating the new data source: Could not get information for 'WindowsApplication1.Item_Database_A.accdbDataSet3'
[Code]...
I am trying to subclass the password recovery control in asp.net (4) so that I can override the behaviour of the OnVerifyingUser event but I'm having trouble adding my subclassed password recovery control into the page. I tried creating an asp:placeholder control and adding a new instance of my subclassed control to it but I just get an error that says "An entry with the same key already exists". I've tried doing this in the page_init and page_load methods but get the same error.
Here's an example of my subclass
Partial Class MyPasswordReminder
Inherits PasswordRecovery
[code].....
1. I have a DataGridView box, that is connected to a MySQL database via the 'Data Source'. I am trying to do the datagridview1.rows.add("info here"), however i receive an error i cannot do this programmatically. I DO know the code to post to MySQL via the "insert into" la la la.However, I was curious if I can do this via the datagridview a bit..easier/simpler, such as a "datagridview1.rows.add(stuff)" sorta thing.
2. I am attempting to make a custom control, and as with ANY control, they have their.. settings. Example, a textbox, or label, has so you can set the Text. and color, etc.Others, have it (such as datagridview) have the little icon on the control itself, where you click it, and it opens a small window with settings.
I'm having an issue with a program. It seems to run (continuously) any amount of time from a few days to about a week.Eventually, and seemingly randomly I get the following Errror. None of the users see a consistent item that is causing the hang, and sometimes it's even just running with no interaction with the user.I just get long signature alpha numerics as a debugging tool.Is there any way to
a) force my program to kick out of the hang if it detects one, (and I guess, how could I write a separate thread to detect a hang?)
b) find out where my program is hanging?
c) if none of these options are viable, some coding practices I might be doing wrong that I could change to help avoid this?
I'm having some difficulty with a sorted & grouped listbox in WPF vb.net 3.5 that has an items source bound to an ObservableCollection.
What I want to be able to do is to retrieve a piece of data from the ObservableCollection items source depending on what item in the listbox the user has selected.I've almost got it working but because the listbox is sorted it does not match the index of the items source.
[code]...
As I previously mentioned, because the lstBox is sorted and also grouped the index's don't match up.Does anyone know how I can get the correct information I want from the List Source depending on the selected item in the list box?
I built a database from an .sql script file in Microsoft SQL Server 2008 Express Management Studio.Now, I need to connect an application I'm developing to this database. So in Visual Basic 2008 Express (that's what I use) I go to:
Data-->Add New Data Source-->Database-->New Connection
In the dialog which pops up (name: Add Connection) I set:
Data Source = Microsoft SQL Server Database File
[code]....
I am usinf VB 2005 Express and I an trying to connect to a SQL Server 2005 Express Database using the "Add New Data Source"I keep gettig the following error.Unable to open physical file "C:Program FilesMicrosoft SQL Server MSSQL.1MSSQLDataHeartland.mdf. Operating system erro 32: "32(The process cannot access the file because it is being used by anither process.)"An attempt to attach an auto-named database for the file C:Program FilesMicrosoft SQL Server MSSQL.1MSSQLDataHeartland.mdf failed. A database with the same name exists, or specified file cannot be opened, or it is located on UNC share.
View 2 Replies[Code]....
am getting error: End os statement required
how do I scan through the web page source of WebBrowser1 for a line of code, and if the line of code exists, enable Timer1.
View 1 RepliesThis will check for an item in a listbox.[code]...
How do I check if an item exists in a listbox?
The following code will save an item to file over and over again, but how do I save an item only once?
Dim w As New IO.StreamWriter("E:est.txt", True)
w.WriteLine(ListBox1.SelectedItem, True)
w.Close()
If, for example, number1 is already saved in the txt file then how do I not save it again, using something like the following?
dim exist As IO.FileAccess ("e:s.txt")
if exist.that.item.is.exist= true then
w.WriteLine(ListBox1.SelectedItem, True)
[Code] .....
I am using VS 2010.
I am filling a listview control with a big number of items but i came across an problem, the repeated values. In those items i use .Text and .Tag so i can relate some hidden values per item. I have been trying to use the items.find() with no luck since it looks like to search for keys, which i don't really have. Every item has different .Tag values but it can happens that they have the same .Text Is there any way to remove or just not add items based on a .Text search in the ListView?
View 13 RepliesI refreshed my data sources to include additional items from the SQL Server databases and it appears that my entire data source from my VB.NET project disappeared.I am using Entity Framework. I may have clicked on something wrong, not quite sure. Unfortunately I can't recreate the Data Source without creating a new Entity and Data Model.I can delete the entry in the App.Config file and recreated it, however things aren't quite right.Is there a way that I can recreate my Data Source from the entry that is in my App.Config file...since that appears to have remained intact.BTW, I can go to my Data Model and successfully refresh from there, however my project isn't connecting to the database so I have quite a number of errors until I can get reconnected.
View 4 RepliesI 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.
see if an object is already in a generic List(Of T) than the way I am currently doing it? The way I do it at the moment is like so:I have a method that I call each time I want to check to see if an object exists in the list (if it already exists I do not want to add it again) and the list to check is passed in to this method along with the item that should be added to it:
[Code]...
So as you can see this function just loops through the list that was passed in and if the DisplayName property of one of the items in the list is the same as the ProgramName argument that was passed in to the method as well then it returns True to indicate that this program is already in the list.I thought about using a Predicate with the List.Find method but cant see how I would get it to work because that predicate method will not have any way of referencing the list (its a method local list, not class level)
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 RepliesI 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 RepliesI 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 RepliesI 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 RepliesA 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)
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] .....