Visual Studio 2008 Express Edition.I have a have a DataSet, created from (part of a) Access database. I have tow tables in it (say A and B). When I change something in table A, I need to get data from table B to complete table A.My approach was to use the RowChanged event inside a (Partial) Class of table A. For that to work however table B needs to be shared. (I don't like to refer to an instance.) I got it to work by changing the DataSets designer code, but don't want to do it all over again when the code is regenerated for some reason. So: would there be any way to have these tables shared by default?
I use single column datatables in combination with the .DisplayMember and .DataSource property to populate comboboxes. Data for these datatables I get from a MySQL database. All this is working fine, but I noticed some behavior for which I can't find an explanation, and am not sure of if it can be prevented somehow.Some of the datatables are used for different comboboxes on different tabs. The behavior found is that with comboboxes that have the same datatable as datasource. If I select an item in 1 combobox, the others automatically select the same item.
-Is this normal, because I couldn't find any documentation on this behavior?
-Can it be prevented, and if so how?
I could use a for next loop and manually add each item to the combobox, but using .DataSource is so much cleaner and more efficient.
I've added a column to one of the tables in the database. Is there a quick to reset one of the datatables within my dataset so that I do not have to delete the whole datatable and add it back in?
We are updating our SQL SERVER 2005 database to reflect the name of our new corporate masters and we need to change the values of the fields.
Once we do so, we will hit those fields with update queries, but right now, my group just needs a listing of the affected tables There are over 250 tables to search, is there a way to iterate through the tables?
I imagine I could search the datatables once I get them, so that part isn't a problem. I just need to know how to set up some code to peek in, record what needs to be changed, close it and move on to the next table.
I've done as much for a single table, but never a load like this.
I have this controls ComboBox: list of myobject TextBox: view a description DataSource: list(of MyObject) MyObject:
property id as int property combodesctription as string property description as string
What I want: I set the datasource of combobox with list of MyObject when I select a value on combobox, I would like see description in TextBox is it possible bound text property of TextBox to same datasource of combobox or it is possible change description of TextBox only with changedEvent of ComboBox?
I have a goal to have dropdowns populate using a string array as the datasource. Re-binding works well in the dropdown event, but if I make a change to a currently selected line item it won't change until I make the box dropdown again. Is there a way to keep this updated without re-binding the data?
Also, this is one of several dropdowns on an MDI child form. I'd like to make sure they're all synced. For instance if one has "Bob" selected and I change Bob's name to "Chris" I need all the "Bob" dropdowns to change to "Chris". Is there a way to do that without having to cycle through all the windows and call a rebind function?
Finally, I want to know if there's a better way to do it than the way I'm doing it. Since all these children have to be synced, the MDI parent holds the String array as a public property and the children each leech off of it.
I have been searching for quite a while about joining multiple datatables via LINQ to dataset (When i say multiple, i don't mean just 2!!!), and it seems there aren't lot of examples in the net. I have seen examples of joining two datatables, done that, no problem there. Now i want to join three datatables. And there's nothing i can find out there.For example i have a 3 datatables:
Heres my issue, I am retrieving data from xml and populating a DataSet with the results into multiple DataTables but i have an issue where an item is repeated in my input data and it is causing it to exception because of the constraints imposed between these tables. how can i determine if a row exists prior to adding the DataRow and thus not include it in my DataTable?
I created a DataSet using the DataSources wizard. I can display the rows of each Datatable one at a time. But in this case, I needed to add a new DataTable (newDT) using the Add New Table Adapter control(?) on the toolbox. newTable is derived by JOINing three different existing tables (or, dataTable) in my DataSet designer. The query works fine and returns all the data as expected. Trouble, if I try to display the rows of the newDT on textboxes, I get a NULLREFERENCE Exception.
I'm having a hard time joining 2 datatables and have the joined datatable as result. First datatable (labels) holds data including a printerid. Second datatable (printers) holds printer references (id > unc). I would like to have as endresult (joined) a datatable with all data from the first datatable with the field (unc) of the second datatable. [Code]
my question is, is there a way to filter records in the dataset and use that records to fill in the datagridview? for example, a datatable (with 3 columns: ID, StudentName, Gender) is filled with list of students. i have two datagrids in the form namely DatagridView1 and Datagridview2. DatagridView1 is where the the list of student where Gender is equal to M and DatagridView2 is where the the list of student where Gender is equal to F.in my current solution, i am using a loop.
I am working with a Windows Application that was developed in VS2008 on a SQL2000 database.I am trying to determine the Datasource of a row in an existing DataSet. I have narrowed it down to 2 possible tables that each have a row with the same identical name.
I want to create an enterprise wide dataset so that my function will call this same dataset from any of the webpage. I've created shared code in the App_Code folder. In it, there's are dataset properties. Will the pages extract info from these dataset properties each time I call the shared program or will create new property for each page.I'm trying to emulate an Enterprise Java Bean type of coding.
I have an untyped DataSet: "ResultsData",which contains several tables: eg "EntryList_table".The Parent Form reads lines from a text file, parses the line, and distributes the necessary data to the corresponding data table.I then have several child forms which contain DataGridViews, each displaying the data in a unique format. All of these tables are Read only, and the DataGrid views only need to display the data attached. However, when I open the child forms, the data does not seem to update with each line read from the text file? As they are bound to the DataTables in 'ResultsData', the column headings appear correct, but will not populate the new data.I would like to have a 'Shared' DataSet that can be accessed by each child form (when activated), and will allow continuous modifications as the input lines are read.
I made an application that was used by one person only, but now my boss told me that this application it'll be used by all company.I made the application with a dataset that have the datasource in a access database that's installed with the application. The user can add, delete and change values in the database, so i had to put the database in a sql server to everyone see the changes.There's someway to change the dataset datasource/connection string?
I have an access database with 5 tables.I want to fill a dataset with the entire contents of the database.Why can't it roughly look like this?[code]Instead I'm having to create an adapter for EVERY table, tab the table name (why?), fill the schema, and then fill the table.
It works, when I make getBar methods public, but I don't want to expose these unneccessarily. Why I can't call private shared methods from a public one in the same class is over my head. I'm using .net framework 4.0 in a web application.
I've taken over the maintenance of the website (ASP.NET VB) and on one particular page I noticed the below code
Inherits System.Web.UI.Page Public Shared UserNumber As String Private Sub Page_Init(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Init
[Code]....
My question is whether the variable UserNumber can be accessed or changed by any other user than the current one?
Given in the following language specification, for me at least, calling Db.Foobar() [In the following code] does not indeed call off to the Shared Constructors of the base classes. I am curious as to a) is this my own fault for doing something wrong or b) is this an error in the language specification[code]...
I seem to be drawing a blank. I'd like to create a "shared" variable that is shared with all instances of a class but not classes that inherit from it. For example.Class A: Shared list As New List(Of String): list.Add("A")
Class B Inherits A: list.Add("B")Class C Inherits B: list.Add("C")The end result I'd like is that any instance of A has just A in the list. Any instance of B has A and B in the list. Any instance of C has A, B, and C in the list. I can accomplish it by creating Instance variables, but I have to construct the list for each instance of a class. I'd like to construct it once for a specific point in the Hierarchy and then share it accross other instances of that class.
I am trying to add shared members in derived classes and use that values in base classes...
I have base
class DBLayer public shared function GetDetail(byval UIN as integer) dim StrSql = string.format("select * from {0} where uin = {1}", tablename, uin) end function end class
[Code]..
currently there is error using the tablename variable of derived class in base class but i want to use it i dun know other techniques if other solutions are better then u can post it or u can say how can i make it work? confused...
I'm trying to create a program that will merge two data tables (one from a database on a network drive, the other is found in a database on the local machine). Each datatable is identical in structure, only (maybe) differs in content. The structure has a primary key, dateCreated, and dateLastEdited fields (plus other fields). I would like to merge down from the network to the local database. If the primary key does not exist on the local db but does on the network, copy from the network db to the local table. If it does exist, check the dateLastEdited column and copy the latest row to the local table.
How would i set up the code to do this? Any assistance would be great.
I need to marge two datatables with condition. I have a datatable where the data comes from a local XML Database and another datatable where the data comes from a remote SQL Server. If any update made in the remote datatable I need to update/merge with the local datatable. Here is what I have so far:
Public Sub MargeTwoTable() Dim SQL As String = "" Dim RemoteTable As New DataTable Dim LocalTable As DataTable
[code]....
In this code data comes from the remote database which updates a date getter then the local database . Both tables have "ID" as the primary key. The code is working well, but the problem is that when more than 1000 records are updated this function takes too long using loops.
I have a Main Table that contains all the distinct values in a DataTable.DataColumn. also have a Child Table that contains distinct values created by the user.I want to merge the Child Table DataRows that match on the Value column with theMain Table DataRows to create the New Table (shown below).I want to preserve the values in the Selected column of the Child Table.Here is my problem, if I use the DataTable.Merge method the DataRow that contains "888" in the Child Table is added to the New Table, but it doesn't contain a RowState = Added, thus I can't filter for added rows to remove them.
