I'm creating an occasionally connected application with a local (client) .sdf data cache. I added a new table to my server database and want to include this table in my local data cache and synchronization. Is there an easy way to do this?
View 1 RepliesI have followed this walkthough at http:[url]...but I am having problems working out how to save changes to the Local Database Cache so that I can use the bidirectional sync. This walkthough does not provide the code to save local changes,I have added the line of code for the bidirectional sync and it works if you drag datasources direct onto the form from the XSD but this uses the component TableAdapterManager and the method UpdateALL which I cannot see how to implement in this Walkthough ?how I change the local Database Cache and update back to server in this walkthrough ?
View 6 RepliesI have the following code in my config.vb file in app folder and almost all of my pages use this code for permormance issues i need to have it cached for exp use cache.insert to cache each property How should i use caching?
BR>Public Class Config
Private _physicalPath As String
Public Property physicalPath() As String
[CODE]..........................
I'm working on a windows forms application (.NET 4.0).My form contains a 'Fast Line' chart using the Microsoft chart control included in VS2010.The chart gets filled with about 20,000 datapoints.My application then starts receiving market data from a server via DDE (Dynamic Data Exchange) in real-time and adds it the chart.
View 5 RepliesI have the following VB.NET code to set and read objects in cache on a per user basis (i.e. a bit like session)
Public Shared Sub CacheSet(ByVal Key As String, ByVal Value As Object)
Dim userID As String = HttpContext.Current.User.Identity.Name
HttpContext.Current.Cache(Key & "_" & userID) = Value
End Sub
[Code]....
I use these functions to hold user data that I don't want to access the DB for all the time. However, when the data is updated, I want the cached item to be removed so it get created again.
How do I make an Item I set disappear or set it to NOTHING or NULL?
We are developing this system that's constantly connecting and retrieving records in our Sql Server 2000 database. The problem is. is that when the database is down we can't use the system. So we are tasked to modify the system to have offline access feature without data replication rather making a xml cache or any flat file data cache.
My question is, what is the most optimized way to make this work?
BTW, the offline data should be synchronized when the server gets online.
We have data that's updated nightly in a database residing in the same instance as my app's database. So to save on database calls, I want to cache this static-for-the-day data into a List(Of MyObject). From a theory point of view, should this cached List(Of ) be cached in the presentation layer code, via a global variable? Should it be in a global variable in the .DLL?I'm thinking in the .DLL, because I created a service layer, which is exposed publicly to the GUI and makes calls to the data access layer inside the .DLL:
Public Shared Function Search(ByVal criteria As Core.Other.Customer) As List(Of Core.Other.Customer)
' TODO: Check the customer cache to see if it has been populated yet. If not, populate it.
If 1 = 1 Then
[code]....
I have programme which contains two list box. when exe is launched it retrieves data from web references [from web services] and immidially it creates folder of cache so when next time exe. is launched it displays data so fast in listboxes. and if cache folder is deleted and exe. is again launched it takes some time to retreave data and again it create cache folder.. how can be this done. if i wish to added controls in cache
View 17 RepliesI am having a remote server it has INVENTORY DATABSE , and also iam having same databse in my local system. I want to populate by local database table with my Remote database table through Vb.net code by click a button. How to do this .
View 1 RepliesI've been trying for hours to do this and can't figure it out.. I'm trying to add a new record to a table in my local database.. Heres the SQL code im using at the minute.. I keep getting this error
"The data was truncated while converting from one data type to another. [ Name of function(if known) = ]" on the line
SQLCom.ExecuteNonQuery() Dim SQLCon As New SqlServerCe.SqlCeConnection
Dim SQLCom As New SqlServerCe.SqlCeCommand
[code]....
what is the best approach in VB.NET to get the entire table from the Ms SQL 2008 R2 database and save it in the program (dynamic?) array or something which is easy to translate into bytes and send to other device via socket communication?
View 1 RepliesI do not know much of datasets. I have created a local database with a table as per img 1 attached, and I use them in a simple drop down selector as per img 2. But I get the message as per img 3 , and I played around with the dataset, removing teh primarkey, etc.
View 2 RepliesI have a datagridview which is bound to a local databse table through a Linq to SQL class.
Everything works as I would expect, when the application runs, up to a point.
If, in the datagridview tasks pane I enable Adding, Editing and Deleting all work as expected.
If I disable Adding & Deleting, leaving Editing enabled, Editing works as expected.
If I disable Deleting & Editing, but leave Adding enabled, Adding does not work, despite the row for new records being displayed. I can move around the row but not enter data.
I suspect somehow its the datasource as opposed to the datagridview that is the cause of my problem but as I say, I can add rows if the Enable Editing option is selected.
Changing the relevant properties programatically makes no difference.
I've been searching for the reason for a couple of days without success.
I have a workaround, by leaving Enable Editing set and programatically setting each row during the RowPostPaint event to be readonly except the row for new records. I would just like to understand what is going on.
I have three table and I want to put the three table's data in one variable and from that variable i will produce the datatable and then want to write the data in CSV file.I am Following this step..
Void
GetDetails()
DataClasses1DataContext
[code].....
I have a login form that consists of 2 text boxes: txtUser, txtPass. Now these are not bound to any data table & I don't what them to be bound. When a new user enters his user name & password, I want to add these on a data table that has two columns: User, Pass. Data table information: Data Source = Login.accdb, Data table = LoginTable, Connection = LoginCn. I use visual basic 2010. So how do I do this?
View 1 RepliesI have this code to edit the datarow of my table adapter but t doesnt update the table. I think i have a missing code that's why but i cant figured it out. by the way im using vb2008 and SQL as my database. [code]
View 3 RepliesI currently have this working already for one of my combo box's, but when i try to use the same code i get this error ''There is no row at position 6.'' . The are 2 fields in the table asset_type_id, asset_type_name', im trying to dispaly the values in a combo box for the field 'asset_type_name.
the code for ' Friend Sub RetrieveCustomerInformation2()' works but the other friend sub throws the error.
Imports System.Data.SqlClient
Imports System.Data
Imports System
Imports System.Data.OleDb
[Code]...
i have managed to add a database to my project its kind of a client database tells me their first, second name, email, date they last called etc etc anyway everything works fine it allows me to add, delete edit etc no problems.What i wanna do is on my main form i have a DateTimePicker1 if i select a date on the DateTimePicker1 how can i make it display last client calls in a RichTextBox?
[Code]...
I need some informations to do my project. From webservice I get mye data as a List and this is stored in my application in bindingsource.datasource. The list do have many properties which displays as columns in the datagrid successfully.But my problem is how do I store the data in my local memory? You might say just make some local dataset or datatable....,but how do I convert the list to datatable? Or how do I convert bindingsource.datasource to datatable?
View 4 RepliesHow to insert data from local SQL server to remote SQL server (without using linked server) like below?
insert * into [remote server].[northwind].orders
from [local server].[northwind].orders
While am using the below code it was throwing an exception update unable to find table mapping [Customer] or data table customer.
[code]...
I have 1 access database with 3 tables How do I make the combobox get data from one table and input it to another table?ex.I have a table with all my Carriers and another table with jobs that are assigned to Carriers?
View 3 RepliesI am trying to copy a table from a network database to a local database. I used DAO and could check if the network table existed using a function that tried to assign a TableDef object to the table in question. If there was no error then I assumed that the table existed and the function returned true...Or it would error out and return false.I could then proceed with the copy or not as the case may be.I am converting the code to ADO.net and need to know how to check for a table. [code]
View 1 Repliesi have a combobox on the form and a datagrid viewer .no i want to display the table which selected on combo box..
View 1 RepliesI need a simple method for a user to enter as many rows of data as they wish (probably won't exceed 50 in most cases and that's pushing it) and then store that data for retrieving the next time they want to reuse that list. I will also need to read the rows in for manipulating text in a file with those entries.
Would the best method to be to use the DataSet in VB Express 2008 and then use the DataGridView for allowing the display and entry of the data?
I've been looking over a bunch of code snippets and I'm just not understanding what is going on there.anding the connection, reading/manipulation, and closing pI keep reading all about these DataAdapters, Ole and Sql and Sqlce and I don't know which to use or whatever.I made a database in VB.NET 2010 that came out as database.sdf and I selected the Local Database option (I assume this is relevant?). I then populated the database with a row of data with column titles and a primary key. The table contains many different columns, but for test purposes, the following is relevant:
DB Name: db_test
Table Name: Locations
Primary Key Column Header: CITY
[code].....
I am writing some software that should respond to commands from a port.
How do I set up a handler to respond when data is recieved at that port.
Do I need to do anything special, like respond or set up the port in the first place.
I don't have any experience doing anything like this!
CheersGuy Joseph - Intel Quad Q9450, 4Gb Ram, 3x500GB Hard Drives, NVidia 8800GT, Marian Marc 8, VB Express 2008
I have set paths in my program to look for files in the "c:/Documents and Settings/User/ Local Settings/Application Data/".How do I add the "Documents and Settings/User/Local Settings/Application Data/" folder in the setup program? Everyone tells me to use the Local Settings path for my application data but I can't add this folder in the File System Editor. I have read many different help files concerning special folders but none of them explain how to add the local application data folder.
View 1 RepliesI am about to develop an application in vb.net 2010, until now I used to connect to database server to manage my data . Now i need to develope an .exe which could run in any pc, so I need somehow to store the data in a local database which is embedded to my application, I see .NET has a local database. My question is a right choice to use a local database for these kind of solutions?
View 4 RepliesDoes anyone know how this can be done? The problem is that when you run the script to add a domain user to the local group as a local user you have no permissions to query the domain. Is there a way to pass a user name and password when doing this? [code]...
View 3 Replies