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.
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How do I assign datasource to my reportviewer?
Imports System.Data.SqlClient
Public Class frmExamAttendance
Private cnn As New SqlConnection(My.Settings.MyConnectionString)
[Code].....
I am a beginner in vb.net and I need to customize our application based on end user requirement in the office, I need to create Login Box for the Application to protect my database. I have a loguser table in SQL with field on userid, username and a hashed password for everyuser. Now I created a new project in vb.net and I am confused to what to use on the toolbox? First I use the windows forms to create the txtbox, command button and labels, but then I am confused already I can only create local login in my pc windows account, I need the log-in on my database application based on their username and password saved on the tables.
me..ExampleSQL(datainformation):ServerName=Aries,
DatabseName=Jupiter, TableName=UserLog,
FieldName=Username, Userpassword,
Example in VB.net forms I created lblUsername, txtusername, lblpassword, txtpassword and btnLogin.
Is there a way to check whether a datagrid is assigned a datsource. How can I distinguish a unassigned datagrid from a datagrid that is assigned a datasource.
View 2 RepliesI normally place all db related work in my databases in SQL Server Express 2005. But in tutorials I have seen, I heard that one needs to re-create referential integrity and relationships and constraints and checks and defaults anew in datasources mapped onto databases. Is this true? What parts of a database are NOT mapped on to datasources?
View 2 Repliesi have a win app in vb2005 but when i want to create a data-source to connect with my database i got this error: The file \CATV-ANTIVIRUSdata|CLINICA_Data.mdf is on a network path that is not supported for database files.
An attempt to attach an auto-named database for file \CATV-ANTIVIRUSdataCLINICA_Data.mdf failed. a database with the same name exists, or specified file cannot be opened, or it is located on UNC share. i need the datasource to start creating datareports but i don't know how to resolve this problem before.
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]....
View 3 Repliesi 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.
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"?
View 3 RepliesI use vb.net and windows form and sqlserver
I added Data Source(Microsoft SQL Server (SqlClient)) to my project. and now I need to change it to ODBC Data Source .
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:
Private
Sub
SaveToolStripButton_Click(ByVal
[code]....
I would like to Display a note from a column in the Notes_tbl to a text box this from an Access database.[code]...
View 5 Replieshow do you add information from another data source cell to a to another data source cell in a different form
View 1 RepliesDataGridView1.DataSource = Table1TableAdapter.Fill(
Me
._OperatorGUI_DatabaseDataSet.Table1)
[code].....
I have this
[Code]...
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.
EMP_IDTextBox is from datasource on a form, and I tried to show messagebox to see what the value is
Whenn I try case 2, the messagebox shows me correct value, but not for case 1. It shows me no value even though there is a value.
How do I do it and what is the diffrence between case 1 and case 2?
I tried with a textbox which is not binded to datasource on case 1, then that shows me the value.
Case 1
Public Sub Save_Data()
Dim L_EMP_ID As String = Me.EMP_IDTextBox.SelectedText
MSGBOX(Me.EMP_IDTextBox.SelectedText)
[Code].....
Im a ASP.NET beginner. I previously asked how to do some databinding to a repeater without a datasourse.
[Code]...
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.
View 1 RepliesI 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;
Me.ProjectFileTableAdapter.Fill(Me.ProjectFileDataSet.ProjectFile)
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 have 2 tables Table A & Table B Table A has the table values that I want to be populated in a datagridview control.The challenge is that column 1 in table A contains an ID(foreign key) to a name field that is a located in table B. I need the datagrid to have the first column be a combobox that displays the names(from Table B) that are already in table A via the ID's, but reference the populating values from Table B. So that when you bring down the combobox you would be choosing from Table B data but populating table A with the ID and you would see a name there instead of an ID.[code] How do I populate my DS dataset with Table B? And how can I create a link to these two tables using a bound datagridview control?
View 1 RepliesIs this software what i need to install to extract data from PDF documents using 2005? If so is this the link i need to get it from? [url] I just got no idea about itextsharp
View 5 RepliesI 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
I had all my fields on a form. THey became to many for the one form, so i moved them to a Tabcontrol. I split the fields over 5 Tabs. I did not change the code.Now , when i load the form, it does not connect to the data until i click on the tab. How can i fix this.
View 2 Replieshave made a connection to a database through VB and i was able to extract a single value from a record and display it in a datagrid table, but i don't know how to display that value in a textbox. i tried doing e.g. txtABC.text = datagrid123.item but it seems that the values cannot be converted between the datagrid and the textbox.
View 2 Repliesget the GPS data using vb 2005?
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