i am building a database application in vb.net and i started by adding a data source from the DATA in the toolbar. my connection is good and it shows all my tables in the data source panel.
i also see new classes related to my database, like
sakilaDataSet
sakilaDataSet.customerDataTable
...
and so on.
how do i query and use these ? i googled a lot and i am not able to get this.
Dim cust As sakilaDataSet.customerDataTable = New sakilaDataSet.customerDataTable
Dim row() As System.Data.DataRow = cust.Select("customer_id=5")
MsgBox(row.Count)
My last try was with the above code, but the row.count always turns out to be zero.
I would like to implement a generic Linq query on a DataGridView.DataSource to retreive a row whith an idField. I did search MSDN, StackOverflow, etc... but didn't quite find what I'm looking for. how I could implement it ?
This is the non-generic code, but I would like to make it work whatever the type of the DataSource is (as long as it implements IEnumerable I guess) and the name and type of the key field.
Dim query = (From note In notesList _ Where note.IdNote = mIdNoteSelectionne _ Select note).FirstOrDefault() Dim ancienIndex As Integer = notesList.IndexOf(query)
noteList is a List(Of Note), Note is a simple entity class I created, with just members and properties
This is in VB, but feel free to send some C# code, I'll translate it.
My program needs to create a mailmerge with Word using a specific group of clients from the sql database list. I have a datatable set up in the database that stores the clients information on the individual user's computer.
The code below will automate word to create the mailmerge, but I can't figure out how to pull the following from my client table and use the results as a mailmerge datasource[code]...
i need to query the datatable & set the outcome as datagridview controls datasource
vb.net Private Sub Txt_Search_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Txt_Search.TextChanged 'routine objective:- Filter datatable & set the datagridview datasource
I am trying to find a way to use a month calendar control as an object data source, such that when end user selects a given date, or a date range (1 week max), it will supply the date range criteria for an access query, and the results will wind up displaying in a data grid view below the month calendar. I am having a really hard time..
how to write the date criteria into the access query for something like this
I have a sqldatasource with a very simple select statement that should always return one row. I have textboxes on a page that i want to fill with that data from the datasource. how could i do this for textboxes? If there is no data in the database then i want the textboxes to remain empty.[code]....
my program has a datalist which list out all the item from datasource and display the detail information on different textbox the problem happened while i click "vitamin a" from datalist, and the "supplier name"will display "daily medicine",then when i click "vitamin b", it will display "sunny medicine",finally when i clicked back "vitamin a", the supplier name still remain "sunny medicine" which mean it does not change from "vitamin b"?
I am using the following code to add a row and data into my datasource.[code]Row # 150 for example, the reason is I want to be able to only add 1 record and if the end user adds another one it overwrites the exisitng one and also be able to retrive that record the next time program is opened.
I took the liberty of creating a small slideshow showing my problem. view it here.
[URL]
As you can see, I start with an empty data table on the data source. I add information to a form and the data appears on other parts of the program through data bound list boxes and such. I can exit debugging mode and re-enter it, and the data is still available.
However, the data is NOT actually added to the data source's table.
If I modify the program at all, the data that is floating around disappears.
I do not understand why this is happening. Apparently I need some kind of code to tell it to write permanently but I have no idea how to go about it. This is something I've been fighting with for over a week. I cannot find any solid information about this online at all.
creating an application using VB 2010 Express. i found data I entered into table were not saved (after I clicked"Save" button)successfully into Microsoft access file which I had added successfully as datasource.These are the codes:
which is supposed to get all the data from my table and set it as the datasource of a DataGridView. You can see where I put in two msgbox's to view how many columns are in the DGV before and after the "update". The first count gives me 22, which is the correct number. After the .DataSource and .DataMember lines are ran, the count jumps to 41 and I have no clue why. All I want to do is clear a dataset, fill it with the new data and set it as the data source of a datagridview. It appears the info is being saved to the table correctly too.
I'm trying to open a crystal report and have the datasource to be a data set but i'm having some problems. here's what I got so far:
My application is using a sqlCe database. On form1, I dragged the dataset, from the datasource tab, onto the form. when the user clicks a button on form1, this is called:
Dim rpt As New WorkLink_Application() 'The report you created. Dim MyCommand As New SqlCeCommand() Dim myDA As New SqlCeDataAdapter()
[Code].....
on the crystal report, i went through the database expert wizard and selected the dataset from Create New Connection-->ADO.Net. I then dragged a field from my table onto the report. When the report is opened, though, the field is not shown.
I am developing a winforms application that will have an offline mode, so that it can access the data if an internet connection (or more accurately, a connection to my WCF service) cannot be established. I have decided to utilize SQL Server Compact edition on the client side of the application & was wondering what the general consensus is on the "best" practice for making the client application (Sql Server Compact) subscribe to the master database (MSSQL 2008).
Management enters information into a web based administration panel that I developed and is stored in a MSSQL 2008 database.After adding / modifying information, they can click a release "datapack" button which will increment a "datapack" version number, which will later be used by the client application to determine if they are in sync or not. When the client application is started, it connects to the internet and determines if the version numbers are in sync. If not, it pulls the information from the server.
That third step is where I'm a bit lost I thought about simply developing a web service that will expose a dataset containing all of the data and just iterating through it doing inserts, but that seems terribly inefficient to me. The full database probably wouldn't amount to much more than 5 MB total, so that led me to think it would be great if when management clicks the release datapack button, it would store the database in a file that could simply be downloaded and would replace the embedded database. Again, I'm a little lost on how that would work. This is my first time working with an embedded database, most of my work has been web/win apps that have real-time access to the data.
I have a question about binding the datasource (MS Access database) to a listbox in a VB form. I have created a listbox and in the datasources explorer I have my datasource say SampleDS. I have several columns inside my datasource, say name, age, address in it. If I select name and drag to the listobx in the form, only the entries in the name column will be displayed in the listbox.
I want to know how to filter the name based on criteria. For example, how do I display names whose age >25?
I have a Query that is in designe mode I have created 4 columns and formatting 4 columns also in datagrid view control now I want to use datasource of dgv control now when i defining datasource property with table then dgv control displaying my predefine columnas and adding 4 more columns in dgv for defining datasource.now presently to avoid autogenerating columns I definie the autogeneration column=false at this situation if i define datasource=table the no data is come up..so my query is it is possible to filled up data in predifned column using datasource property.
I am running VS2008 and am using VB2008. I have created a solution file with a Windows Form Project. It contains one form. I created a class project called DataAccess. I selected that project and created a data source. Now I see the XSD for that data. If display the "Data Sources" window I see the datasource. So far so good. If I select the Windows Form project, and then display the "Data Sources" window I get an empty window with a "Add New Data Source" button/link. How do I make the data sources created in the second project available to the first one?
I have been watching the videos for creating n-tier apps that suggest adding a third project to the solution called DataEntities. I did that. I then click on the XSD in my DataAccess project. Then in the properties of the XSD I change the "DataSet Project" property to point to my new DataEntities project. When I save the DataAccess project the DataEntities project gets a file added to it as expected. But then the Data Sources window is empty no matter which of the three projects I select.
Clearly I am doing something wrong. The videos all show the ability to see the data source in the "Data Sources" window after setting up this three project structure. One other thing I noted. In most of the pictures in articles showing the Data Sources window. The top most entity in the window is the project file itself. Then in a tree structure you would see the various data sources under that top most entity. When I was able to see something in the data sources window, the top most entity was a data source NOT the project file, with the data sources under it.
Any idea what I am doing wrong? It seems like I need to do SOMETHING to make the data sources in one project visible to the others. And possibly something to make a datasource visible once split apart using the "Dataset Project" property.
I have a datasource linked to a table in a database.When I wnated to display this data on a form, I just dragged the datasource onto the form and it did everything for me, including the code to fill it;
My problem, is that this program will have multiple users, and I don't other users to be able to see each others data. So the problem with the above statement is that it fills the table with ALL the data in the datasource. How can I make it only display data that is for a specific user?Here's the code that is used to fill the tableadapter:
Private Sub frmViewCurrent_Load(ByVal[code].......
i hve create combobox & text box and add database source to my project...i know how to binding data or load data to combobox using SELECT query..but can i change SELECT to INSERT query cz i wont when i type data into textbox,data will be in database...second..can i binding without add database to project..i mean mydatabase in debug folder..i hve problem binding data if database is not in myproject..
I am using Crystal Enterprise 10 to run Adhoc Query to generate reports.My database has data with 4 digits after decimal point. But, the Ad Hoc query report rounds the data to 2 digits and displays that. Is there a way I can change this default behaviour to show the data as it is without rounding it?
What i want to do is use specific rows from a table in a database and input the individual rows each in its own textbox. So the logic works like this: Database(deals_info.mdb) with table called ME with the following rows : Serial, telC, telO, telA, PostalAddress, Email, FullName.So i know i will be using a Dataset and DataAdapter but i dont know what the syntax should look like to get the individual rows' data in the textboxes of my form.[code]Those are the declarations of the names of my textboxes from my codebehind file, does anyone know how i would be able to get the table/row information from the ME table in my database to put each row(Serial, fullname, ect) in the relevant textboxes? I am using Visual Studio 2010 with .net 4.0 and this is an asp.net webform.
Is there any way to retrive data from Database with out writing any sql query . I mean i want to read data into my label fileds with out writing any query in sqlcommand. me how can i do this in c# or vb.netUpdate
