Created A Data Reference To One Of Its Tables?
Sep 16, 2009
I have an application that I have in VB Express Edition 2008. I have an MS Access database (Access 2003) that I have created a data reference to one of its tables. The table contains 3 fields ID (Counter), Name and Price (text and double). When my form loads I simply want to read each record in the table and create a variable with the same name as the product name and assign it a value the same as the price in the table. So, record 1 in my table has Prod1 in the name field and 2.59 in the price field. I would like these variables to be created when the form loads and be available until the user exits the form.
It seems simple but I cannot find reference to a similar situation anywhere I have looked.
In the Form_Load routine the following line was generated via the designer:
Me.PricerTableAdapter.Fill(Me.PTODataSet.Pricer) assist if possible.
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Sep 29, 2011
I had to add another table into my database and now I need to go back and update a page that allows inserts into more than one table. I didn't write this page, so I'm trying to clean everything up, but there are some parts that I don't really understand. Now I have broken the page and it only inserts into one table. The very first one that I insert into.ProductName: goes into the Product table.Description: goes into the Picklist table as Data.....it also is supposed to generate an insert into the marketing table based on the PicklistID which is an identity column. The marketing table tells the Picklist table that it is looking for a description. [code]
Like I said before, only the insert that goes into the Product table works. Before I added the Picklist table and tried to reconnect everything, this entire page worked. The code was a lot sloppier and didn't have parameters, so that could also be where I messed up since I am still trying to learn how to use them. I have gotten everything to INSERT except for the INSERT to the Marketing table.
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Jul 25, 2012
I am using VS2008 and SQLite. I have created a database and several tables and am attempting to populate the tables with data from arrays.
The following code (example) works fine but stops after it inserts 30 to 50 records. I am running the VB code in debug mode and when it stops, I press pause to see where it is. It stops on "SQLcommand.ExecuteNonQuery()" and when I press continue (F5) it will insert another 30 to 50 records.
I do not get an error message. Is this a timeout issue? How do I keep the loop running to the end of the array?
Following is example code.
Dim
SQLconnect As New SQLite.SQLiteConnection()
Dim SQLcommand As SQLiteCommand
CODE:.....................
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Dec 30, 2010
I am in the middle of the creation of an application using vb.net. I have a database created in MS.Access which includes 7 tables. I connected this one with my parent program code. Now the problem is that I want to display the data from each column. I have 12 columns and 14 rows in my first table. How can I display data from one column in a Combo box?
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May 4, 2010
I have made a form that creates a table in a database based off of the text a user inputs into a text box.I would like to then display that table in a DataGridView on the form so that the user can update the data in that table.Is there any way that i can add those tables to the dataset and get them to display in the DataGridView after the user clicks the create table button?
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Jun 10, 2011
I have a VB.NET App that creates forms from a template.I am having problems getting them to communicate with each other.Is it possible to send data from one textbox in the first instance to the same textbox in another instance.[code]Lets say i put the name in the wrong window by mistake - is it possible to send that text to the correct form.Issue is all forms seem to be called FormNameWindow - and i can't reference them by potential form name.
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Mar 17, 2010
I have a VB.NET App that creates forms from a template.I am having problems getting them to communicate with each other.Is it possible to send data from one textbox in the first instance to the same textbox in another instance.EG
Names By Letter.
Dim NewNameWindow As New FormNameWindow()
NewNameWindow .Text = "Starts With *"
NewNameWindow .Show()
Where * would be the letter you click on.Lets say i put the name in the wrong window by mistake - is it possible to send that text to the correct form.
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Mar 20, 2011
I'm writing a program that inserts controls onto a webform dynamically. Depending on a variable, I add either a textbox, a set of radio buttons, or a set of checkboxes. Later, after a user clicks a submit button I need to use the controls to determine if the user is submitting the correct answer, but when I try to reference the id of a control, I get "txtAnser is not declared. It may be inaccessible due to it's protections level. Here is the .aspx page (it's the standard content page of a master page):
[code]...
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Jan 16, 2012
Been searching a trying examples for a couple of days and always fall back to the "null reference" error on this one. I have a set of instructions coming from a SQL database and the number of instructions is a variable. Therefore, I have a TabControl which I add TabPages to at RunTime depending on the number of instructions there are. The TabPages are then created with the names; Step1, Step2, Step3, etc.Each TabPage is made with the same controls and all of the controls are named the same from page to page (e.g. "instr" is the name of a TextBox control that exists on every TabPage).I can successfully create a GetControl method that will return the correct TabPage, but I cannot reference any controls on that TabPage.I can only change properties of the TabPage.If I try to reference a specific control on that TabPage, like the "instr" TextBox control, I get the null reference error.[code]
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Feb 14, 2006
I have an app (vb.net) that sues multi threading and have tow problems.
1. The program is used for trading currency markets and mointers prices all day. When a signal is generated it wil place a trade in a new thread. In the new thread it checks to see if a trade is on already and if so it will not place another trade.The problem is it can be too fast and place another trade before the server has processed the first trade. So trade count returns 0. As the system watches 6 accounts I can not just pause the other thread to make sure it has finished before trying ot place another trade.How to i check to make sure the first thread is finished so when i check for trade count it retuns 1?
2.The new thread is inside a class and has a logging class as well. The problem is writing to the text box on the main thread. As the logging thread is created in the new thread it has no access to the textbox. I have tried using invoke but it still does not write to text box as it does not exist in the new thread.How do i reference a form from a class that was created in a new thread?
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Apr 27, 2011
I have an ASP project which references a WCF service. Does exactly half of what I need.
A button on the page calls a function from the WCF, which returns a list of objects (variable names). When returned, the vb code dynamically adds textboxes to a panel on the page.[code]...
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Jun 10, 2011
I have programmatically created a listview in n # of tabpages to display information gathered from an SQL database.Once created, i want the user to be able to select an item from any of the listview's. How can i reference the selected item?[code...]
All i want is to know that when a button control is clicked, which item is being selected in which listview?
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Jul 15, 2009
I have one control named thumbviewer inside repeater. I want to set its imageurl in
code. Currently it's done in aspx itself as
<asp:Repeater ID="Repeater1" runat="server" >
<ItemTemplate>
<span style="padding:2px 10px 2px 10px">
<bri:ThumbViewer Id="Th1" runat="server" ImageUrl='<%# Eval("Name", "images/{0}") %>' Height="100px" Width="100px"/>
</span></ItemTemplate>
</asp:Repeater>
How can I set ImageUrl in code?
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Aug 15, 2011
what is the best way to load dropdown lists from reference/lookup tables for a desktop application? the application is layed out into 3 tiers. I've built up my entities.the front end has a form with 6 tabs. and one big save (another discussion :)Should I load them all when the form is initially loaded? Are there any caching mechanisms I could use?
it is vb.net app on a network drive that is accessed by several users.it's also worth noting that some reference tables may be updated. Via another form.
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Sep 28, 2009
I would like to know the best, or standard, way to accomplish real-time client updates in a small multi-user application using an access data table as a data source.Specifically, this application will be used by 3-4 people. It uses a datatable which is filled on form load and bound to a datagrid at design time. The datatable is stored on a shared drive. The data table on the shared drive is updated in two ways:
1) Users can update the datagrid which then updates the datatable on the shared drive via the data adapter's Update method.
2) A server application does some work on some text files, periodically updating the data table.
I need the clients to reflect the changes to the data table on the shared drive as closely to real-time as possible. I know that the data table stored in memory on the client is disconnected from the data table on the shared drive, so I must query again to get the updates.
1) Is there an alternvative model I can use which is connected, and which will automatically reflect the updates in the data table on the shared drive?
2) If not, what is the best way to check for changes in the data table (so I can know when to call the data adapter fill method)? I am planning to poll the drive for a change to the .mdb file, raise an event and then fill the data adapter when the event is triggered. I am using this method successfully now to check for changes to a text file in another application, and I know how to implement it?
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Sep 28, 2009
I would like to know the best, or standard, way to accomplish real-time client updates in a small multi-user application using an access data table as a data source.
Specifically, this application will be used by 3-4 people. It uses a datatable which is filled on form load and bound to a datagrid at design time. The datatable is stored on a shared drive. The data table on the shared drive is updated in two ways:
1) Users can update the datagrid which then updates the datatable on the shared drive via the data adapter's Update method.
2) A server application does some work on some text files, periodically updating the data table.
I need the clients to reflect the changes to the data table on the shared drive as closely to real-time as possible. I know that the data table stored in memory on the client is disconnected from the data table on the shared drive, so I must query again to get the updates.
I have two questions:
1) Is there an alternvative model I can use which is connected, and which will automatically reflect the updates in the data table on the shared drive?
2) If not, what is the best way to check for changes in the data table (so I can know when to call the data adapter fill method)? I am planning to poll the drive for a change to the .mdb file, raise an event and then fill the data adapter when the event is triggered. I am using this method successfully now to check for changes to a text file in another application, and I know how to implement it
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Jul 27, 2009
I have two data tables within my data set that are loaded onto my form on form_load using statements written in code (not the designer. When I change a value for the first table via a text box the change is made to the data set. But when I try the same for the second table, the change doesn't remain in the data set when I switch to a different company and come back. I query the second table using the primary key of the first table but no code is needed when I change the values for the first table so I don't understand why the same doesn't work for the second when I change a value via a data-bound text box....
Here is my code that initially binds the data:
'This is used to read our data from the data base
Public Sub Read_Data_SQL()
Call Clear_Bindings()
[CODE]...
Here is the code I call when the selected index of my company combo box changes to have the second table reflect that of the first:
'This sub populates any information contained in the Contact2 table
Private Sub Update_Contact_2()
Dim Company As String = cmbCompany.Text.Replace("'", "''")
[CODE]...
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Dec 5, 2011
i am trying to join 2 tables together and display them in a list view. i have this code so far
[Code]....
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Jan 25, 2011
if it affects the run time of a program if I were to have multiple data tables as opposed to one data table with all my data in it? I am trying to minimize datagrids and just use code to access table data, in hopes that it will speed up my program. But I am ignorant if multiple tables vs 1 main table will make a difference because there will still be the same amount of overall data present in my program one way or the other....?
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May 25, 2012
I have been trying to find and/or think up a way for data to automatically update a data table.I have a log that shows all the customers that came in today with various information. There could be twenty or thirty employees adding to this log or updating or doing things with that customer. This information is in a Data Table on a ASPX page in Visual Studio 2010 that the code is binded in the aspx.vb page that is calling a page in my APP_CODE database file that calls a query in my Database to get the information.My question is could someones actions on a different computer make my computer refresh or to re-bind that data.I have thought of some kind of timer/counter maybe that looks to see if the count of the log is different.
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Nov 27, 2011
i compiled 1 control in vb6. now i'm trying use it in vb2010, but i recive 2 warnings:
"Warning1A reference was created to embedded interop assembly 'stdole' because of an indirect reference to that assembly from assembly 'AxInterop.Sprite'. Consider changing the 'Embed Interop Types' property on either assembly.WindowsApplication1" and "Warning2 reference was created to embedded interop assembly 'stdole' because of an indirect reference to that assembly from assembly 'Interop.Sprite'. Consider changing the 'Embed Interop Types' property on either assembly.WindowsApplication1 "why these warnings? (i have sure that in vb6 don't give me any errors)
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Dec 1, 2010
I am about to commence a little project whereby using a forms based application to visualise temperature in a building over a day. I am using data loggers placed strategically around the building (these record temperature and time of the read). I am planning to use a picturebox with the buildings floor plan within it and on using a scrollbar (using time as the metric) scroll through the day with temperature being represented by the size of the graphics on top of the floorplan (these represent the location i placed the data loggers around the building).
I have already built a tool to digitise the location of the loggers on the floor plan (saves the data loggers id ref and x y coordinates in the picturebox back to an access datatable).I am planning to use loops on scoll to draw and resize the graphics in another picturebox. The data loggers could be many (up to 30 or more) hence i am concerned this might grind to a halt or become so staggered that it will cease to be useful.The question i would like to ask is is this the most efficient way of doing this or am i going down a dead end.
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Oct 2, 2009
i wanted to add data from a single form in vb to two tables in access but an error appears saying that the field customer_ID down to Contact_Number doesnt belong to the table record, though it really doesnt belong to that table.. but i already indicated the table for the customer_ID down to Contact_Number, which is Customer, in my sql statement...
Public Class Refill
Dim connect As New OleDb.OleDbConnection
Dim sql As String
[Code].....
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May 16, 2010
I'm trying to develop a windows application, I'm using VB.NET(Visual Studio 2005) and MySql database.
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Mar 27, 2010
this is the code i am using to print the contents of my datatable:
Private Sub PrintDocument1_PrintPage(ByVal sender As Object, ByVal e As System.Drawing.Printing.PrintPageEventArgs) Handles PrintDocument1.PrintPage
Dim xPos As Single = 120
Dim yPos As Single = 120
Dim i As Integer = 0
[Code]...
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Oct 3, 2009
[Code] what i really want is to add another table to my database with different fields with my first table and have my form in vb input data to the two tables. i already tried it but i always have errors. what should i add to my code?
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Aug 11, 2009
I have 2 DataTables in vb.net. Each is populated from it's own stored procedure. Table A contains a project number in the first column. Table B also contains the project number in the first column. Table A could have many records that have the same project number, but Table B will always have just one record in it per project number. I would like to append the data from Table B to every matching record in Table A. How would I do this?
[Code]...
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May 21, 2009
I am using VS2008 Standard, Access 2007 and VB.net. I have an Access db with a Membership table, a DuesPayment table and a table linking the two together.
[code]....
1) In VS I have a single form (frmMembership). I used the Data Sources window to create a single datasource containing the tables tblMembers, tblDuesPayment and lktblMemToPay. from the 'Data Sources' window I drug tblMembers, as text boxes, to the form. I drug tblDuesPayment to the form as a DataGridView.
I right-clicked 'dsMembership...Edit in Dataset Designer' and checked that the relations between the three tables was as shown above. I left all other settings as they were created by VS.When I execute the app I get the member information as expected and can use the TblMembersBindingNavigator to step through the members. The DataGridView, instead of showing dues payment information for the member showing on the form, shows ALL of the dues information for ALL members does not exhibit any relationship between tblMembers and tblDuesPayment.
2)I also tried creating a dataset for tblMembers only. Then I used 'dsMembership.Edit in DatasetDesigner' window to create a TableAdapter for tblDuesPayment and lktblMemToPay. I got the same results.
3) I tried various other combinations, like creating TableAdaptors for tblMembers and a TableAdaptor for a combination of lktblMemToPay & tblDuesPayment.
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May 6, 2012
I am making a survey-application in winforms that is connected to a MySQL database. Now I want to show the alternatives of a question, and how many answered each question. I have a table for alternatives called tblAlt and a table for answers from users called tblAnswers.
There are only 5 alternatives for each question. Is there a way to get each alternative, and how many answered each of them with one query?
This is what I made so far, but this is definitely wrong:
SELECT tblAlt.altText, Count(tblAnswers.answerID)
FROM tblAlt, tblAnswers
WHERE tblAlt.questionID = " & CInt(questionID) & "
[Code]....
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Apr 1, 2009
How can I save data in the textbox to two different tables? I have it bound to tableA to display data and I want to save that data to tableB and tableC when I click save.
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