DataTable Navigation - How To Get Each Record Sequentially
Mar 1, 2012
I have an application that downloads about 19,000 records from a SQL table and I need to step through all the records doing a calculation on each then create a new Excel workbook with the data.
[Code]
m_rows does accurately report that the number of records in the datatable is the same as in the SQL table. I can add records to the XLS file with a for/next loop but they are all the first record of the datatable. So now that I have the data, how do I go through each record sequentially?
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Oct 12, 2009
I have already connected MS Access to Visual Basic .NET 2003 through this tutorial [URL] I want to add some record navigation on my program like Previous Next Add Delete Save buttons.
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Feb 22, 2011
I have very strange problem, here it is: I have a quite large MS Access Database (2003) containing exactly 68020 records (rows). The problem is, when i read the entire database directly toa data representation control like DataGridView or Listbox,only 66710 records are returned. The weird thing is: If i load the entire database to a in-memory datatable object, rows.count gives "correct" amount of records as expected, that is 68020What is the reason of that? Why DataGridView or other controls cannot have records more than 66710 items? Is there an internal limitation? (That's dread if there is).
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May 14, 2011
I have a dataset, which have a column create_date which have value(5/12/2011 12.54.00) , but i want to select the value from dataset with date only not by time (i.e. 5/12/2011),[code]
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Apr 19, 2010
I want to use FindBy method to return record in a datatable and show the fields in the corresponding textboxes and other controls. The DataTable in which i am looking is already bound to these controls, maybe when I use the following code (which is not working correctly, hence this thread) the fields will show up rightaway?
{
Dim MoviesRow As New_Movie_DatabaseDataSet.My_Movies_TableRow
MoviesRow = New_Movie_DatabaseDataSet.My_Movies_TableDataTable.FindByID(ComboBox1.Text)
}
This is the error:
reference to a non-shared member requires an object reference.
I wanted to import Microsoft.Practices.ObjectBuilder2 but that does not work either.
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Aug 8, 2009
I'm just writing a quick program that will ping servers on my network and display the results back to me by changing the color of the Server (item) in a listview control.
[code]...
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Nov 4, 2011
How can I Declare a groop of sequentially named Labels?[code]...
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Oct 14, 2010
I am using a variation of Stanav's example from the previous post seen in Sub dd_Inhoud_Labels. The first 3 Subs (Add_Titel_Label, Add_Byskrif_Label & Add_Lewering_Label) is allso shown below so you can see what I am leading up to. Sub Add_Inhoud_Labels is not only responsible for creating labels but allso placing them acording to the location and size of the previos label and allso ather properties as Font and so on depending on the marker at the start of the text string saved in the data base.The problem I can not get solved is that only the last of the Inhoud Labels seem to be created, it seem to be in the correct location as last label as seen in the pic below
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Jul 25, 2011
I have a Console app that loops through a queue and processes each record in a datatable. Each process is long and time-consuming (connecting to a remote website, downloading files, reading them and adding them to the database). I'm trying to implement threading for speed's sake but am having cross-threading issues. (The job takes 8 hours or so to run and the cross-threading doesn't start happening until a couple hours into the run.)I'm trying to figure out how to make my code thread safe. I don't update or rely on any non-local variables, and I don't need to return anything. I've tried locking which works but defeats the purpose of the multiple threads. What other things should I be looking for?
[code]...
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Jul 26, 2010
I want to rearrange a list of items in different orders for few times; ie: the 2nd in the list becomes the 1st & the previous 3rd becomes the 2nd, ... then the Last one becomes the penultimate one.In the next round, the 3rd of the original list becomes the 1st & the 4th of the original becomes the 2nd and so on. (That is, each item moves one rank above & the Top one goes to the Bottom)Given below is an example.Here, I took only 6 items & rearranged for 5 times only. (I should be able to use several Items and to rearrange for many times).The Original List:
(1) Alpha, (2) Beta, (3) Gamma, (4) Delta, (5) Epsilon, (6) Zeta
2nd List:
(1) Beta, (2) Gamma, (3) Delta, (4) Epsilon, (5) Zeta, (6) Alpha
[code].....
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May 27, 2011
I have an object that looks like follows:
Public Class MyObject
Public Property Key as Intger
get 'Elided for clarity
[code].....
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Mar 10, 2012
I am getting data from an SQL Server Database to display into text boxes.
However I also tried getting individual data or current data to display in the Gridview but not working. I am sure I am not doing it right.
I can get the data to display in the Grid view but not individually or scroll through as I hit the next button.[code....
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Sep 13, 2011
Learning about threads at the moment, barely managing to wrap my head around it, anyway I was wondering how you would go about making threads run sequentially from threadpool if you added them with
threadpool.queueuserworkitem()
In my code currently I know it is not running sequentially as I set it up to call a function and print a number each call. I gather this could be achieved with using synch lock but not quite sure how.
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Jan 10, 2010
Is there any way using existing .NET framework classes/methods that you can sequentially read a byte array? I dont mean just using a for loop to loop through from the beginning to the end, I mean having the kind of methods that you have when working with an IO.Stream subclass, such as ReadByte. I thought I would just be able to construct a new IO.Stream class and pass it in a byte array but it seems that Stream is just for inheriting and cannot actually be used itself. I could implement my own class that just has an internal position counter and a byte array and then each time you call ReadByte on that it advances the position and returns the byte at that index... but it seems odd to have to implement such a basic thing myself.
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May 25, 2012
How to change listview row colour sequentially?
[Code]...
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Apr 18, 2009
I hav a web service which pull records from a database and I am hosting these services in IIS which works fine but I am trying to retrieve the record and display the record in a listbox displaying the time field as the text for that record.I have created the following function
public sub get_data()
dim dt as new data.dataTable
dim service as ws webservice.webservice
[code]...
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Aug 9, 2010
I am trying to check a record in database before inerting a new record here is my code but problem is when i enter a names first alphabet it imediatly populate massage. i want to check it after entering whole name
Private Sub TextBox1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox1.KeyPress
Try
Dim cnString As String = "Provider=Microsoft.Jet.OLEDB.4.0; Data Source=" &
[CODE]...
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Apr 20, 2009
I posted in the wrong forum the first time around, and I'm pretty sure that's why it never even appeared. Oh well. THIS is the right forum now, I hope, so here's my problem:
I'm basically simulating bowling. I've created a form that has a "scoreboard" on it, and I'm updating the cells of the scoreboard to display the bowl result. Without doing 21 if statements, I figured I could call a method, send it which roll number it is, and then use a for loop to update each label's text values.[code]...
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May 17, 2010
How do I force users to save the current record (if current record has changed) and not let user go to the next record unless the save button is pressed?
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Sep 4, 2009
I have a asp.net web page where i will navigate pages on the click of the "Next" button
Page1 will got to Page 2 and then page 3 and page4
But in a selection of dropdown in page 1 it decides page 2 should go to page 3 or page 4
How can i know where they set this page navigation? if suppose i need to change the navigation order?
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Jun 29, 2009
how can i create this navigation bar or xp bar??
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Apr 18, 2012
I am using VB.net 2010 and sql server 2008. I want to have data navigation buttons like next, previous, last , first etc. I am using data reader object to accomplish database manipulation. Now, I want to show Next database row, on Next button press, and same with previous etc.
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Jun 6, 2010
I am using visual basic and when I try to hide Navigation bar, I am not able to, it is disabled. Ok I tried to turned it off going to "all languages", althought I unchecked the setting. It didn't disappear. I restarted visual studio, closed all open classes. It is just visual basic, when I try with c# I can hide and show it.
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Mar 25, 2011
navigation from one page to another
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Feb 8, 2010
I am designing a web application in Visual Studio 2010 Beta 2, using Silverlight 3, with Visual Basic as the underlying programming language. What is the Visual Basic code that I would put in a Button1_Click event to tell the program to navigate to another UserControl XAML file?
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Feb 16, 2009
I am learning VB 2008 newly. I want to develop a students database. I have prepared all the required specifications. I have started using VB2008. I have created the initial form. I now want to navigate to the next form by clicking one of the buttons created. It shall go to the next form that displays students personal details.
I am not able to find how to create a new form that will navigate from the exissting initial main form.
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May 11, 2009
i'm using vb 2008?i have a datagridview which is bound to a datatable.within the grid is a list of orders, i want the user to be able to type a number in a text box, hit a button and have the datagridview go to (and select) the row that is relevent to the value in the text box.this is also applicable where the user wants to refresh the grid to pick up any new activity, but when the refresh still have selected the same row they did before so for example write current record to a variable (id number, or the unique key of the field) refresh gird navigate to and select the unique row from the variable?
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Jun 18, 2009
i have a webbrowser control using it i navigate the webpage and also using vb.net form button i gave autofill value to the webpage text box.it also works fine and it opens new webpage
but i cant give now values to the new webpage textbox which is in same webbrowser control .please help me sir
i need to give value to that new webpage textbox value by using vb.net form button event
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Apr 26, 2011
I'm learning WPF, and NavigationWindow in particular. I want to add stuff to the window, like a status bar, a favorite bar, etc. Unfortunately when I try adding anything, I get an error.
I'm hoping there might be a way that pages can be bookmarked as someone browses between them; let the user drag pages up to a favorite bar.
Something similar with the status bar; I'd like to have page specific information on the status bar, without having to have it on each individual page.
Is this possible with a navigation window, or am I barking up the wrong tree?
Edit:
<NavigationWindow x:Class="Window2"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
[code]...
I ended up putting the status bar on the individual pages, so that I can more easily change what's displayed from page to page, but the tool bar behaves nicely with the frame.
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Jul 7, 2010
I have a database with 2 tables master and detail, the detail has a picture field and the PK and FK. I use this code to navigate through the records, is there any simpliest way?
me.bindingcontext(dataset11,"Table1").position += 1
me.bindingcontext(dataset11,"scan").position = textbox1.text
where scan the detail and textbox1.text the PK of the master, it is a little slow.
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