ADO Open And AddNew Method For Large Database?
Feb 8, 2010[code].....
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Test Textbox Before Addnew...to Database?
Jun 4, 2010I have a text box which I'm saving to a database. Before doing a addnew which add a line to the database with a Id number and a blank item, I wish to test the textbox for actualentry before. Here's code I'm tryin
If
Me.TextBox1.TextLength > 0
Then
[code].....
Visual Studio 2010 Addnew Event And Save To A New Database?
Feb 26, 2012Can someone help me i am trying to add and save customers to my database and it doesnt seem to be letting me unless i directly go into the grid and add them there. You can see that the addnew button adds them but it wont save them. when i go back and preiview the data on the table its not there. I am just tring to develope a regular simple customers database
View 3 RepliesCompiler Slow On A Large Solution With Extension Method Project
Nov 13, 2009I'm working on a larger VB application (framework v3.5) where the compile time continues to get slower and slower the larger it grows. It currently takes about 7 minutes to compile just the extensions project. We have other similar projects in C# that don't experience the slow compile time.
View 1 RepliesMoving Large Instance Method To Shared And Creating Stub?
Jun 5, 2011If I have a very large function/sub in a class that is an instance method (i.e., not Shared), do I gain or lose anything by moving that to a shared method and then declaring a small stub method for the instance use?
I.e., I go from this:
Public Sub MyBigMethod(ByVal Foobar As String)
If String.IsNullOrWhitespace(Foobar) Then
Throw New ArgumentNullException("Foobar")
End If
[Code] .....
My thinking is I save on memory size per each instance of the object. Because each instance only has to lug around the stub method which handles calling the shared version and passing an instance of itself to the shared method so that it can do whatever it needs to do. But I'll wager that I sacrifice a very teensy amount of speed because of the added function call overhead.
How To Open Large PDF Files
May 13, 2009I am opening a large PDF file using the following
Process.Start(Application.StartupPath & "PREVI.pdf")
I have two questions:
1) Is there a way to go directly to a page number?
2) Can I write a code to have the table of contents show up on the left side of the document so users can click on to go to different sections of the document, not sure if this needs to be done while creating the PDF or if we can do it by code.
Out Of Memory Exception For StringBuilder.ToString Method For Large Size Of String Data
May 19, 2010I am facing an amazing problem in my application. On my Developement server when I am running my application, then there is one function where I am trying to put whole stringbuilder contents in a string object. This Function is used for paging the reports.For that I am using a method of Stringbuilder.tostring() and when I chek the value of this statement (stringbuilder.tostring()) it shows no such interface is supported, which later on throws exception of system is out of memory. Here i am using .net 2.0 framework and sql server 2005 database.But when I run the application on stagging server then there is no such exception thrown.[code]
View 3 RepliesInterface And Graphics :: Open Very Large Image
Aug 13, 2008I have a map image and i want to open it look like ACDSEE (very fast)my image is 12756 x 8504 pixel and i try backbuffer but not work for me.
View 3 RepliesUse Of Backgroundworker While Open A Large Text File?
Apr 3, 2010How to Use of Backgroundworker while open a large text file
View 3 RepliesOpen Large Rich Text File Smoothly?
Jan 8, 2010If there is any way to open large rtf files in rich text text box ?when i try to open a large rtf file in rich text box it halt the system unlike windows word pad . win word pad open file smoothly may be read line by line how it possible in vb.net?
View 3 RepliesOpen A Large Text File / Find And Replace A String
Nov 1, 2009I would like to step through each *.txt file in a given directory, open it, find and replace all, perhaps a thousand, occurances of a given string (e.g. "00/00/00"), then close and save file, and step to next one in the directory to do the same find and replace. I've been looking at filestream classes and regular expressions but don't see a clear way to do this.
View 4 RepliesHandle A Very Large Database?
Mar 13, 2012I'm faced with a (fun, actually) data mining problem; I have raw ASCII files from instruments, and I want to move that data (~100 GB) into a database, then be able to run various algorithms determining correlations of time series, etc. I would like to write the mining algorithms in Visual Basic (.net, VS 2010 right now), and be able to do visualizations with VB code I have in hand.On the nature of the data: think of a set of several thousand devices, each recording a measurement at a given interval - so I'm talking time-series vectors.
I spent today re-acquainting myself with VB.NET's interface to (in one case) a Microsoft Access database. What used to be fairly simple - DAO I think it was - involved tables, recordsets, etc (and that would likely be fine). Now I seem to be required to have a weird variety of generally useless objects, e.g. 'adapters', 'datasets', etc. The problem is that I know exactly what I need, and all this extraneous stuff just gets in the way (certainly in coding complexity and opaqueness, and likely in efficiency as well).If any of these mechanisms gave me a kind of virtual access to the entire dataset, and let me control caching parameters, etc.it might be great, but I found nothing along those lines.
Anyway, I tried a number of different approaches, and none seemed at all aimed at what I need to do: efficiently do math on a large dataset. I can't believe I'm the first to have this problem, but I can find no useful wisdom out there. I'd be comfortable with pretty much any underlying database mechanism: MySQL, SQL Server, MS Access, but ideally something generally SQL based (I may eventually have to transition this entire system to draw from a client's SQL database, though that's not an overriding concern now). Other than that I want simplicity and efficiency. I thought my old ODBC techniques would work, and to some extent they do, though modifying tables seemed to have bizarre problems (no errors, but not modifications either).
I do have a fairly aggressive deadline to show some algorithm results, so my focus in the short term is to get something reasonable working *in* the short term - in other words, it's less important to me to pick the 'fastest' relational database than it is to pick a database that lets me focus on coding the algorithms, not working through tedious data access coding. If this db could be any smaller, I'd have tried to do it all 'in memory' at least for proving concepts; I don't want to have to learn an entire jargon and approach just to be able to retrieve data points, and write out new info (e.g., first derivatives of time series).
Perhaps I'll need to bite the bullet and just write something myself, a .dll perhaps just to save and restore large time series vectors. It seems a bit frightening to me that one would have to do this in this age, what with all the database systems out there, but I don't have much time to work through arcane interface logic.
Forms :: Using Large Database In WinForms?
Dec 27, 2009I am currently helping to write a Visual Basics program that was originally writing with access.The Original Access program has been used and modified over the past 5 years, During that time the database has gotten pretty big.The problem I am having is If I add the entire database to my data sources it creates data tables for every Table and Stored procedure even when they are not currently used in the program resulting in a 20+ minute build time just to debug.I am currently only adding Tables and Stored Procedures as i need them, so its not that much of a problem now, but as I continue to work and add tables the build time is going to go back up, and Id hate to have to wait 20+ minutes to test a small tweak I made.
View 1 RepliesLoad Large CSV File Into Database?
Oct 14, 2009I'm trying to load a large CSV file into a Microsoft SQL Server Compact 3.5 database. I've tried using the following: Using MyReader As New Microsoft.VisualBasic.FileIO.TextFieldParser("filename.txt") MyReader.TextFieldType = FileIO.FieldType.Delimited MyReader.SetDelimiters(",")Then splitting the data with MyReader.ReadFields() etc, before using this data to add rows to a dataset in a database table in my project. However, my CSV files are very large, at above 9.5 million rows, and this takes forever, if the computer doesn't crash also. Does anyone have a better idea for what to do? I would like the CSV file to be loaded into the database table, to enable me to sort it, and undertake some querys and maths. The CSV data structure is:2,193,761.40000000000012,43,1510.22,8,1929.60000000000012,22,2564.52,22,2791.70000000000032,19,2971.6000000000004
View 3 RepliesAdo.net SqlConnection Open Method
Nov 20, 2011I am learning ADO.NET But it very hard for me... I dont understand why have got this compiler error:"Declaration expected" for the connection.Open().[code]
View 1 RepliesBest Practice - VB Projects - Using Such A Large Database With Many Tables
Feb 21, 2012The Adventureworks database is used extensively for tutorials in Visual Basic applications. This has many tables that can be bound to a solution. What I would like to know is, when using such a large database with many tables and using lots of them, is it better to construct your program with a number of projects all under one solution or to put everything into a single project. If you use a number of projects, what is the syntax for accessing each module from a menu strip in your main form? I know how to do this in a single project - all you do is Form(x).show. In Adventureworks, you have a table for Employees that could be put into a single project with a number of forms - one for data entry, one for displaying all of the employees, a filter to a single employee, etc., etc.
If two small projects rely on each other for some reason, again the syntax for linking them could be an issue. Would it be better to combine them into a single project? My reason for asking is that I would feel safer if I created an application on a project by project basis and then brought them all together in one solution. This way they can be tested individually and then linked together where necessary. Making a disastrous mistake in one then only requires a small re-write rather than the headache caused by a total crash of the whole solution. I would like to know which option professional developers take. I am using Visual Studio 2008 Professional and SQL 2005 Express
Read A Very Large Database Table In Program?
Apr 22, 2011I'm developing a VB.NET application to obtain data from any data source (using an odbc connection string), and because this i can't use specific .net connectors like MySql.Net connector and i can't previously know if the file/DMBS supports LIMIT parameter. This app will read data from a table in the data source and use the information to make some files. At this point there was no problem with some tables because they are less than 3,000,000 records length, but there is a table that has 5,000,000+ rows length, and when i send the query the connection is lost. I'm working with OdbcDataReader, because i read on MSDN site that this is the best way to read a table one row at time and i just use each record once.[code]...
View 2 RepliesLarge Multidimensial Array - Write A Program To Do Markov Chain But States Are Quite Large
Jun 9, 2011I want to write a program to do Markov chain, but my states are quite large. First of all I calculate all the transition probabilities and revenues for all states(1381860 total states), and store in a multidimensional array. Public RevArr(0 To 9, 0 To 750, 0 To 282) As Long
After that the iteration of markov chain should use these as inputs to calculate the steady-state probabilities. But when I try to run the main code I got this error.Exception of type 'System.OutOfMemoryException' was thrown.
The following is the declaration of second array I add just another dimension for storing all the iterations, but I get this error. Dim stateprob(IT + 1, 0 To 9, 0 To 750, 0 To 282) As single
Best Or Better Method To Open Excel File
Jun 2, 2011Im struggling on how to open an excel workbook without one of two problems.
1. After the first workbook is opened and I close the workbook, if another is opened the worksheet area is "transparent", as in, you can see the desktop or any open app behind excel.
2. Closing excel and opening another workbook after X times (4+?) via the vb.net app I use causes the computer to reboot.
I am stuck thinking it is the method used to open excel within the app.The code below has two methods, both produce the same affect. One method is blocked (makes it easy to test either one).[code]I have two buttons that open workbooks, both have identical code less the workbook requirements.Is there a better or best method to use for opening excel workbooks from vb.net?
Exporting Large Number Of Records From Database To .txt File?
Sep 22, 2011I have to export the data from the database to .txt file, I have the code below that does export it to .txt file but I'm having problems with this code because the data that I'm exporting is about 5 000000 records, it is quite slow and sometimes the pc can't handle it and stops the exporting.
Dim saveFile As New SaveFileDialog
If saveFile.ShowDialog = Windows.Forms.DialogResult.OK Then
command = New SqlCommand
[Code]....
VS 2010 Addnew BindingSource?
Mar 4, 2012I would like that someone show me (with code) how to add a new row to a bindingsource. The same thing that the bindingNavigator does but writting myself the code.The fields of the table appear in the form using TextBox. When I click the button "ADD NEW", the textBox must be cleaned and must be ready to introduce a new row.
View 1 RepliesWhat Is Substitute For ADDNEW Function
Aug 6, 2009what is the substitute for ADDNEW function in VB5 at the newest VS2008 their there was just recordset to which u apply this function then allwing u to add a record to a data base?
View 2 RepliesVS 2005 Open The Combobox Within The GotFocus Method?
Dec 30, 2010I know that with the Command Button, you can utilize the PerformClick option. I would like to know how you would go about doing something similar for a Combobox.What I am looking to do is open the Combobox within the GotFocus method.
View 2 RepliesDB/Reporting :: Error Record Too Large While Creating Access Database?
Feb 8, 2009use the following code to create a database in ms access
Code:
'reference: Microsoft ActiveX Data Objects 2.8 Library
'reference: Microsoft ADO Ext. 2.8 for DDL and Security
[code].....
Large Database File (mdb) Takes Time To Load In .net So Alternative?
Feb 8, 2011I have 4k records in access database. And one of the field value contains ~100 lines each so and one other field has ~25 lines. So total database size reaches ~30MB and it takes lot of time 15-20 seconds to load the database in vb.net using odbc [URL]..and updating of any other small fields also takes time due to database being large
So as an alternative I used rtf file (txt files were not preserving all the newline characters). So these file are around 5-10kb only. But for 4k records and 2 fields I have now 8k files. And copying of these 8k rtf files is taking huge time for 5MB transfer it takes an hour or so.So is there any other alternative for storage of this data. So that it will be portable and easily loaded/accessed/updated from vb.net?
Binding Navigator AddNew And Set Textbox A Value?
Mar 8, 2010Saving data from textboxes to a dataset Default Values - Binding Navigator But i could not do it or didnot understand how to do it. I have a Binding Navigator created by the wizard, I want to put a value "A" in a Textbox when adding new record (press +). I had tried to use this code in txt_site_GotFocus and BindingNavigatorAddNewItem_Click
View 2 RepliesBinding Navigator Addnew Events?
Jun 19, 2011I need to insert values into a text-box in a database form, after a 'Add new record' event has been executed
If i code the 'add new' button click event on the binding navigator my code is run first before the record is inserted. This over rights the displayed record then the new record is inserted. Where can i place my code to run after the record has been inserted
Bindingsource AddNew() And CancelEdit() Interaction?
Dec 21, 2011I think I started out with a misunderstanding of what happens with addnew() and canceledit().
I have a strongly typed datasource in memory.
I call bindingsource.AddNew()
Later I find that the record the user was trying to add already exists, so
bindingsource.CancelEdit()
I have not set any properties other than datasource on the bindingsource.
My assumption was that the CancelEdit() would rollback the blank row added by the AddNew(), but I'm getting some odd errors which lead me to believe this is not true.
Could someone verify that CancelEdit() leaves the new row?
Bound Datagridview Addnew With Variables?
Feb 23, 2011I am trying to use a bound datagridview and through the add button on the bindingnavigator adding a new row to the bindingsource and then pass two variables to the datagridview in the new row so they can be associated with the proper ids. I then have a save button for when the end user is done inputting the rest of the data for that record.
The code is below:
Private Sub BindingNavigator1AddItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)
AddressesBindingSource.AddNew()
AddressesDataGridView.CurrentRow.Cells("caseNumber").Value = Me.CaseNumberTextBox
AddressesDataGridView.CurrentRow.Cells("interestID").Value = Me.InterestIDTextBox
End Sub
I am attempting to convert and Access CMS to VB and possibly vb.net.
Pre-fill Data Bindingsource Addnew
Aug 21, 2011Im using a bindingsource to add new records to my db using bindingsource.addnew()When this is evoked, it seems to automatically increment the recordcount and then blanks out the content of every bound to that tables bindingsource. So that all fields in the new record have to be filled in manually.I would like to be able to pre-fill some of the data in the new record. for instance, when a user adds a new record, have a specific column in the new record automatically populate with the selectedvalue of a combobox.I assume this means I may have to manually code up my own addnew routine, but google has let me down on where to start.
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