VS 2005 - How To Release Database Objects
Jan 8, 2010
I have developed a small window application, having lot of insert and select scripts. It runs fine for 3 times but when i run it 4th time it gives me Error "Out Of Memory Exception". I observed that in my task manager Sqlserver.exe process occupies memory around 167000K. Then I killed it. and again run the code, this time it occupy 12000K memory. Again I run it...the memory increases and stops at 87125K. All It means i the C#.net objets are not disposed well.
I have tried for
GC.GetTotalMemory()
But failed? How can I release objects?
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Feb 18, 2011
I have the following code below in which I have a class with some class level Excel objects defined.When I call excelModule.Test from another class all these Excel objects are getting created and I can see an Excel instance in Task manager.
Do we have unload event for class to release these objects?
Module excelModule
Public myRange As Excel.Range
[code].....
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Jul 12, 2010
I have a managed class that uses a COM that looks like this.
[Code]....
Since I am using an unmanaged dll through a COM-Interob dll I am wondering if I need free the innerobj manually or if the gc is smart enough to do it automagically if I call ReleaseObject() My class implements IDisposable and I do the following atm: Runtime.InteropServices.Marshal.ReleaseComObject(myobj) Do I need to take care of releasing all inner objects that are created by the COM Object or not? And If I do have to do it, does the order matter (first inner then parent vs parent then inner)?
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Sep 17, 2010
how can i release a form from memory i am using public variables in my form , & the same variables are appearing on the form controls , like text box and datagridview values
i want to use
MyForm = nothing OR MyForm.dispose
so that the form will take rebirth on next open
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Mar 31, 2009
I am developing an application using Visual Basic .NET 2005. The application works fine in the PC which Im using to develop it. I make the setup.exe I install the application in other PC and the application doesnt work but it I replace the app.exe with the one in my debug folder it will work.
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Jun 11, 2012
I have a windows desktop app I'd like to release that would access data from a database on the web. Never done this before, so not sure what's needed either on the client side or the server side.
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Sep 23, 2010
I'm trying to make sure that I don't leave any loose ends open in my application and am concerned about a few but might get my answer from this one. I've "overriden" some functions so that way I can try and keep all the resources as clean and free as possible. So in this instance, I have a function called ExecuteReader which returns a DbDataReader as normal, but all I had to pass to it was a SQL string rather than recreating a DbCommand every time. I want to make sure that even though I'm unable to call dbCommand.Dispose() that it is actually doing so.
[code...]
In here, I set the _dbReader to what I'd get from the function and eventually I close the _dbReader. I do not close the connection as I don't open it each time I make a query. This is a SQLite database that only one user will be using at a time (small application with very very very little likeliness it will grow) so I didn't think it necessary to close and open the connection all the time. Maybe I'm wrong, not sure. Using it this way though, it is potentially ok for cleaning resources?
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Oct 14, 2010
i am using visual studio 2005 on win 7 with office 2007. i have developed win application. i am using microsoft activex spreadsheet component in my program. so it automatically creates reference to AxInterop.OWC11.dll When i run program in debug mode (open program and click RUN in toolbar it works) but if i run directly .exe (go to bin elease doubleclick .exe) it give error at loading point of that component. It says "Attempted to read or write protected memory. This is often an indication that other memory has been corrupted." An unhandled exception occurrs.
[Code]...
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Apr 4, 2010
I am hoping that someone from the forum is familiar with the Doing Objects in Visual Basic 2005 book so that this question makes a little more sense. I have completed the sample project and understand most of what I have done. There are some holes in my knowledge but I am sure I will pick up those pieces as I become more familiar with object orientated programming.
The sample project is an almost complete application where you view and edit Objects that are stored in a database. The author leaves the remaining features needed up to the reader, which is great because I have been able to put new knowledge into use. However I am having trouble saving a new object back to the database.
[Code]...
By looking at this code it appears that I can save the data that is in the bindingsource by changing the EntityState to the Enum added. However I am not sure where to set it. I am pretty confident that I have the rest of this correct because when I try to do the save I get an error that the stored procedure is expecting the GoalID.
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Apr 15, 2009
We created a template using Adobe LiveCycle Design and in order to make our one field work the way we need it to we had to save it as a dynamic xml form (*.pdf) and according to itext in action you cannot use acrofields with this type of pdf since it uses an xml based architectu
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Jun 9, 2009
I was working on one of my forms, not doing anything crazy or out of the ordinary, just adding a control to the form. When all of a sudden vb became real sluggish and barely responsive, so I closed VS and restarted the computer. Got back into my project and now I can't open any form. Opening a form gives me <b>failed to parse method 'InitializeComponent'. The parser reported the following error 'Error HRESULT E_FAIL has been returned from a call to a COM component.'. Please look in the task lisk for potential errors.</b>.Error list sometimes contains 102 errors, and sometime just one that says I have exceeded the maximum number of errors. When it contains 102, every single one of the errors is <b> [Object/Form] is ambiguous in the namespace [Project] </b>.
I can't open any designers right now, every single one of them gives the failed to parse method error. If I rename, lets say frmAbout to frmAbout1, then I can see that form.There is only one of everything in Solution Explorer, no duplicates. There are no duplicates in the folder either. I can open the code for each form/object and see it just fine, and looks fine too. Code is not duplicated or anything.
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Aug 15, 2008
I'm not real sure how to even ask this question... but here goes.I'm using VB2005 and DirectX 9, D3D. It is 2D isometric display.Here is what I CAN do. Create a map grid. Draw each tile out and present the map on the screen. (ISO) I can even scroll around using the arrows and mouse at the edge of the screen.
- I can click on the map and get the X,Y coords of the tile I am on.... look up the grid to see what is supposed to be on this tile.The only game coding experience I have is using windows forms controls... I've done a few dozen of them. Dice games, card games..
[Code]...
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Mar 15, 2011
I have a windows form application and also a exe application that both uses the same dll whic I place in the bin directory The dll is using crystal report and thus I need to reference com objects and other .net drivers. My question is following: Where should I put these references, in the class library (dll) or in the windows form / exe applications. If I put them in the dll, will they automatically be loaded when call the dll (entry point) or do I need to something else (create in installer etc)
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Apr 7, 2010
I am hoping that somebody here is familiar with the book, "Doing Objects with Visual Basic 2005" so this question makes more sense but I will try and ask it in a way that makes knowledge of the book irrelevant.The book contains a sample project that I am trying to use as a "framework" for all my new projects. The project shows you how to read and edit objects to and from a database and that part works great. The author then leaves the new and deletes up to the reader to do, which is a good way to learn. However I am having trouble with the it. My problem is that I am having trouble implementing my own ProcessNew InterfaceI think this is how it should be:
Public Function ProcessNew() As Boolean Implements IMDIChild.ProcessNew
Dim myGoal As Goal = TryCast(GoalBindingSource.AddNew, Goal)
myGoal.Goal = rtxtGoals.Text
[code].....
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Mar 2, 2012
I don't know if this is even the correct terminology but I was wondering if it is possible to bind a row (of data) from a database to an object. I am working on a school project and we have decided to create this application to track a user's BMI/BMR and compare it to the amount of calories they have input. The program doesn't go too in depth so it does not store the calories consumed in the database.
So here is my problem. I have a row in my database:
First_Name -- Last_Name -- Height_Inches -- Weight_Pounds
And I guess what I am thinking I want my program to do is if I have an object with properties for FirstName, LastName, HeightInches, WeightPounds, is to somehow query the database for one row and put the values into the object. All we have learned so far is binding the data with controls which doesn't really help in my case since the work is going to be done behind the scenes.
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Jun 2, 2009
in terms of speed and resource usage is it better to call the access queries using access.aplication or rewriting the database objects in VS? By using access there should be just one version of the queries, not two and access is more friendly for writing the queries.
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May 16, 2010
Private Sub btnPurchase_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnPurchase.Click
Dim objCustomer As Customer
Dim objProduct As Products
Try
[code]...
1- why not just write queries those manipulate the database rather then creating objects, making changes and then going back to database.
2- now that i have got the new balance and the product oder has been made so every time this happens a query has to be sent to change database or there is any other better why of doing it?
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Sep 17, 2011
I've just gotten started with development using Visual Studio (though this can be seen as a more language-generic question), and need done design answers regarding how to suitable relate a Database Entity/Table with an Class in-code.
Currently, I create a class who's attributes or iVars directly correspond to the fields in an Entity.
When I come to fetching all 'Customers from a Table' for example, I run a Select all statement against the database and for each result-row returned, I instantiate a new class Object where I use the Class' default constructor to set the instance variables. (I really wish there was a method like PHP's mysql-fetch-object()?)
I can then add each of these objects to say, a List(of Customer) and return it.
This doesn't seem like the best way to do it. If I were to change the Database schema, I'd have to reflect those changes in the class also.
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Jun 16, 2010
I have a connection string set up and a data reader.I have two textboxes on my form for users to type in. One textbox (txtLogin) is a user name and the other textbox is a password (txtPwd). I'm trying to compare what a user types into those two boxes to a table in a vfp database. The table I'm trying to compare to is open about 99% of the time so I need to be able to read from it in some type of "shared" mode.
My Select statement needs to be something similar to "select * from sites where clogin = txtLogin.text and cpassword = txtPwd.text"I just don't know how to get this to work properly.
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Jun 9, 2011
I have decided I would start small and make a program that would create a "receipt" list in a listbox and a total. Now, I would like the user to be able to add their own "menu" items. I'm assuming the best way to go about this would be to have them actually add it to a database and then a function in the program will refresh the dataset with the new list. However, this is where my problem lies. How can I tell VB .net 2010 that I want to create a new button (or buttons) on the fly, in an orderly pattern on the form, based on the input from a DB?
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Jul 8, 2009
How can we use the database objects from one form to another? Eg. In my Login form a person enters his user-name and password & if it is correct, the code directs him to another form(Form2). Now in Form2 How will I get which person has entered in?
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Oct 11, 2009
I opened vs 2008 and used the server explorer for the first time to create a connection to my SQL 2005 db. The solution explorer pulled in all the tables, the database diagram etc. My question is how do I access that database connection and work with it using ADO objects? Do I need a reference to ADO?
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Oct 5, 2009
I have a problem with access database in my vb project. I would like to fill the listbox with objects from my database. I've attached two images. In first image when i'm using command objDataAdapter.Fill(mydataset....) i can select table property(zaposlen). But in second image or in my second app i dont have an option to select table property in my dataset(there is nothing to select). If i select DataTableDataTable i get next error: DataTableDataTable' is a type in 'WindowsApplication1.baza_podatkovDataSet' and cannot be used as an expression.
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Apr 9, 2010
I have this code that creates a template and stores that template to a local database and I want it also to store in a network database but I'm having problems on the other end it seems it's not storing the right data.
Server side
Dim cnString As String = "Provider=Microsoft.Jet.OLEDB.4.0;Persist Security Info=False;Data Source=|DataDirectory|fp.mdb; Jet OLEDB:Database Password = joceradmin"
Dim fpFilename As String
Dim userID As String
userID = InputBox("Please enter ID number to enroll", "Enter ID Number", , 100, 100)
[Code] .....
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Mar 3, 2010
I am using VB Exopress 2008 and SQl Server Express 2008 in Windows Vista Home Premium. I have created a dataset after importing all tables and queries from MS Access to SQL Server. I have now added a view in SQL Server that I want to access and use in VB Express. However on clicking "Refresh" for the dataset the new view does not display in the available objects, only those I originally imported and opened with the original dataset. What, pleas am I doing wrong? How can I see this new View?
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Dec 5, 2011
make objects from the ToolBox using code instead of changing existing objects invisible then visible later?
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Jun 23, 2012
I am getting this error, Not sure why it is happening "Error The SqlParameterCollection only accepts non-null SqlParameter type objects, not Int32 objects."I have tried with all sorts of possibilties, now try to enter default data as dummy data,
Using connection As New SqlConnection
connection.ConnectionString = ConfigurationManager.ConnectionStrings("DentalDeviceConnectionString").ConnectionString
connection.Open()[code].....
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Jan 29, 2011
I have a program like this.
Module Module1
Public Class Mstr
Public Property Prop1 As String
Public Property Prop2 As String[code]....
But it is not working as I expect it to. You can see it from.The DtlsB properties of all three DtlsA objects are having values from last iteration.
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Jan 6, 2011
I want to let the user input objects to a richtextbox 1 object on each line, and somehow use Random.Next to select pseudorandomly a few objects, the number 'few' inputted in a textbox.
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Jan 18, 2012
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Using conn As New SqlConnection("Database=Clinic_Management_System;Data Source=.SQLExpress;Integrated Security=True;AttachDBFilename=|DataDirectory|Clinic Management System.mdf")
Dim cmdRecord As SqlCommand
[code]....
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