Error In Binding Data After Filtering
Jan 12, 2009
I am trying to make a small application and I have a problem in binding data after filtering them.I use VB 2005 and SQL 2005. The data are shown in datagridview and I bind the selected row to the text boxes of the form. eg.[code]Later on I search the data for some records and at the same time I remove the databinding. When I try to bind them again it does not work because the index is from the whole data and not the filter data.I have fixed the problem in another situation where I had autonumberin as a primary key and I used this as an index. In this case I use platesno as an index and it's not working.
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Oct 19, 2011
This is the code string I use in my app. to bind a label to the relivant data field.
[Code]...
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May 29, 2011
I'm using the following code to refresh my binding sources, but it doesn't appear to be working for my details view.[code]...
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Sep 14, 2009
I have two database tables in SQL Server Express 2008 with the following layouts.
DATA
-------
id
fundKey
amount
fiscalYear
FUNDS
-------
fundKey
fundDescription[code]....
These two tables are related on fiscalYear and fundKey. So if you were to look at the first line in the DATA table you would get:
1,General,2700,2008
I'm trying to create a front-end for this using VB2008. I thought a DataGridView (DGV) would work well for this. So I create a small app to test out my theory. I put a DGV on it and setup a data source to the DATA table using the designer and it works great. Then I change the fundKey column to be databound to the FUNDS column, looking up the fundDescription based on the fundKey. I also change it to a combobox column because in the future I would like other users to easily change the value. And all of this works well.My problem is in that combobox column, all the fund values are listed as options.So it lists: General, Indirect, General, Sponsored. I would like it to list only the values for the appropriate fiscal year. So if that row is for fiscalYear 2008, the fund options should be General and Indirect. And if it's 2009 the options should be General and Sponsored.What is the best way to do this? I thought about setting up views on the SQL Server side and having two datasets in the app and switching between them.
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Dec 13, 2010
I want to filter 2 columns in binding source o
1.- sucursal by watever is in textsucursal
2.- tipo has more then 7 valuyes..but i want to filter by only 4 the ones shown in query..[code]
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Jul 20, 2011
I'm getting an error which says option strict on disallows data binding.
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Mar 4, 2012
I am trying not to become intimidated or give up.I created a simple database and added stored procedures to read the data on a Windows form using Visual Basic in VS 2010.First I tried the Data Grid Example and all worked, I was able to view the data using a connection string to call the Stored procedure.I have stepped it up a notch by trying to bind data to form controls and I am getting this error message when I try to navigate through the data.
System.NullReferenceException was unhandled
[code].....
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Aug 26, 2009
I am trying to write a thread safe application that contains 3 threads : -
1 - Data acquisition and decoding
2- Data graphing
3 - FFT and filtering
Thread 1 is collecting bytes from the serial port and converting them int integers (so taking two bytes) after is has captured 64 Bytes and converted into 32 integers, it then needs to pass the array to the graphing thread.
The graphing thread then plots the data and waits for more data.
Thread 3 also waits until thread one has collected 2023 integers and takes these and performs some FFT calculations (which take time).
My question is how do i share the arrays between the three threads without deadlocking the program? as the serial thread will be flying around reasonable fast (1000 bytes per second) so it will synclock onto the shared buffers for most of the time.
Originally i was going to use two synchronised queues, so when thread 1 has collected 32 bytes it queues the data into the graph queue, and once it has collected 2023 it queues the data into the FFT queue.
Then thread 2 and 3 can simple dequeue the data.
However using queues has the overhead of casting the data in and out, and as i know the data type i was planning on using two arrays :-
Dim GraphArray() as ushort
Dim FFTArray() as ushort
Then Thread 1 adds data to each thread, and thread 2 and 3 simple wait until the correct amount of data is available before removing the data. my question is there an array type that allows me to remove x amount of data from an array?
Because i cannot do this easily with the ararys defined as above (GraphArray, FFTArray), as i was planning on making them 1mByte and allowing thread 1 to fill them Knowing they should never overflow and then let thread 2 and 3 remove x amout of bytes at a time unless there is a better way of doing it
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Dec 2, 2009
I created a query on a Access database, which I would like to show with the datagridview. So, I created a new table adapter with my query, which creates as well the datatable tbl1. Then, the wizard created the datagridview for me, showing the correct data. Now, I would like to filter these rows: I already read it is possible to do it by simply clicking "Add query...", but I would like to do it in a different way. I have some comboboxes, and I would like to use the strings inside them to filter my table tbl1. Is it possible to apply those queries one after the other on my datatable tbl1? I am able to filter only once with:
Me.tbl1TableAdapter.FillBySomething(Me.DataSet.tbl1, params...)
But, if I wanted to filter the result again?
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Sep 25, 2009
I am using a datagrid to display a dataset. I would like to filter rows on certain fields (ex: ____ (Male/Female). I would want to it post-data retrieval on the client side.
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Jan 14, 2009
I have a database with a Student table and a Class table. There are many students and many classes and each student is a member of a class.I then have a windows form that needs to display a list of student names in a listbox. However, I have a different form for each class. So for example in this form I have coded below, I need to display all students that are members of class51. The code I have so far is reading in all students from tblStudent and this is not what I want. I know that if I was doing SQL or something I'd simply write SELECT * FROM TBLSTUDENT WHERE CLASSID =his?
Private Sub frmAttendace51_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
'clear data set of any existing data
[code].....
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Jun 15, 2012
I have a combobox where I use datasource to populate it with data, in the key press event I have the following coding which i use to filter the data.
With Me.Combobox1
Dim ToFind As String = .Text.Substring(0, .SelectionStart) & e.KeyChar
Dim Index As Integer = .FindStringExact(ToFind)
[Code]....
I know this would be possible by me changing the style to dropdownlist but its not exactly what I was after.
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Feb 25, 2009
I am using vb2005, and I am using MS Access 2003 as my database.
This is what I am doing and this is what I would like to happend
I have two combo boxes, combobox1 and combobox2
I have two tables, Application table and Group table
Here is how the data is going to be display:
Combobox1 = Application Table
Combobox2 = Group Table
In the Application Table I have 3 columns ID, Code, Description
The same information applies for the Group table
THis is an example of the Application table
CODE DESCRIPTION
1 Purchasing
2 Stores
3 Assets
[Code]....
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May 7, 2009
Private
Sub
ComboBox1_SelectedIndexChanged(ByVal
sender As
[code]....
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Mar 6, 2012
DataGridView filtering. I have this data bound to a combobox:
Product Index
Prod1 1,2
Prod2 7,8,9
Prod3 10,11
Actual Table structure is:
Index Product
1 prod1
2 prod1
7 prod2
8 prod2
9 prod2
10 prod2
11 prod3
(Product is the Display Member, Index is the ValueMember)
On the combobox's SelectedIndexChanged event, I'm filtering the DataGridView:
DGVCustomers.DataSource.DefaultView.RowFilter = "indexes like '%" + MyDropDown.SelectedValue + "%'"
If MyDropDown.SelectedValue is "1,2" then any record without either number will not be shown , in addition "7,8,9" will only show customers with that string... etc etc. How can I filter the DGV correctly with the CSV style data? (It's not my data unfortunately!)
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Mar 4, 2011
Am back from burial with a simple nut scratch....(hope its simple)I've queried my database from about seven comboboxes, textboxes and datetimepickersbut now before the data is put to the list view i want to sort it further more intogroups. Crop is the main group followed by variety.this is the code under the search button
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim sqlCrop, sqlVariety, sqlEnteredBy, sqlFromTo, sqlSDN, sqlWHERE, sqlAND1, sqlAND2,
[code]......
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May 2, 2011
I am pulling different information from the same file at two different times: 1) The first time, I pull information that is inserted into a combobox. I need to use the combobox as a filter for when I pull the information a second time. 2) I pull different information from the same file, and it is outputted into a datagridview table. I already have a filter in place when the information is pulled the second time, and I was wondering if I could add to that filter or if I have to make another filter? The filter (or filters) will be used to filter the information in the datagridview before it is outputted in a chart.
This is the code for binding the combobox to the information
Dim cnRange As String = "provider=Microsoft.Jet.OLEDB.4.0; " & _
"data source='" & strFileName & "';" & _
"Extended Properties=""Excel 8.0; IMEX=1; HDR=No;"""
[code].....
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Feb 6, 2012
I am looking for a Visual Basic control for my windows application. It's a either a datagridview or listview in VB 2010. The list actually come with the filtering function on the top row. The user is allowed to key in the search key in the respective column and the list will filter at run time. Please refer to the picture below for your reference, the function is in the red box. I found this control in one of the software. Is there any similiar control in the VB 2010 or 3rd party control?
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Oct 24, 2010
I have some code which displays data in a hexadecimal format, so each line of the display looks like this ...
000000 xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx cccccccccccccccc
... where the left six characters are an offset and each xx represents one character and the string of cs on the right are the actual characters.
I've learned that I have to keep control characters out of that string of cs or the display gets messed up. I've been using this code and it works fine (when it's not commented out). (binbuf is a Byte array)
'Select Case Convert.ToInt32(binbuf(i)) < 128
' Case True 'traditional ASCII character
' If Convert.ToChar(binbuf(i)) <> " "c Then
[code]....
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Mar 9, 2010
How to filter data from the database to combobox? For example, the database have the data, and i have a combobox, then i want to type the first letter, and the dropdown list comes down that the data have the first letter that i type in the combobox.
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May 13, 2012
I've got grid data and I want to allow the user to filter it.I'm curious what controls or methods you all have used successfully to ask the user for this type of information.I see EXCEL allows you to click a header - ask for a filter - and get arrows in the heading to allow you to see a DISTINCT list with CHECK BOXES.Google Docs spreadsheet does almost the exact same thing.
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Jun 28, 2010
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?
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Jan 14, 2009
my table is:
CREATE TABLE [dbo].[VarianceReport](
[ID] [int] IDENTITY(1,1) NOT NULL,
[FN] [nvarchar](50) NOT NULL,
[Fdate] [nvarchar](50) NOT NULL,
[code]....
But inserted null value when all textbox is temp!?!How to resolve this problem and best way for this action?
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Oct 28, 2009
My program so far reads a certain webpage's source code and places it in a textbox. This much has already been accomplished.
Now I need to pick certain strings out of the rather large amount of text data and have the lines stored in variables, but the trick of it is, the exact string is unknown. The exact function should be, that the code finds certain tags from the source code, say <td> and </td> and takes the string data in between those tags, what ever it may be.
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Jan 23, 2012
Well I have a list of things I want to search based on multiple points of data...for example Resolution, 3D capable, touchscreen capable....etc....What is the best way for display someone can think of & filtering results by capability, I have none of it typed out, etc...like list of objects & capabilities, etc... alreat...so it can be made any way that is thought to be good(with speed as well) for many different listings...say 1,000 of them & it filters pretty much instantly....reading capabilities & such & the list itself is easy but how can I make a filter(unchecking something brings back things, checking something takes away only since well your adding capabilities to filter selection....I have pictures that can go with items too as well as a name & more information could be given directly with the method or clicking on the picture/item.
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Apr 23, 2010
how to use the VS 2010 IDE tools in a way the Microsofties didn't specifically intend. But since this is something I immediately tried without success.
I have defined a .NET 4.0 WPF Application project with a simple class that looks like this:
Public Class Class1
Public Property One As String = "OneString"
Public Property Two As String = "TwoString"
[Code]....
The expected result was that "OneString" would appear next to "One" and "TwoString" next to "Two" in the running window.
The question is: Why didn't this work? What will work instead? If I put bindings in a DataTemplate, it works. Blend, with its sample data stuff, implied that this should work, but it doesn't.
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Jun 3, 2011
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..
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Apr 2, 2012
Data binding should be an extremely simple thing to manage but I can't find a SIMPLE solution to the following problem.
I have two forms
Form1 contains a 4x4 MSFlexGrid (unfortunately an unmanaged COM object but I can merge cells, which I can't do with a managed Datagrid)
Form2 contains other controls which change the data in the Flexgrid.
I connect the two with a Public 4x4 array. Form2 changes the data in this array. I can update the grid data by reading the array. But how do I bind the Grid to the array so that it auto-updates - which is the whole point of binding isn't it?
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Jul 31, 2010
I have a listbox in my form that gets its values from a data table by data binding. My question is, when the data (row) is loaded it also selects the first line automatically. I do not want this because I want the listbox to select an item only when the user clicks on it. Otherwise, the iteme should ony be listed. Is there a way to manage this?
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Oct 31, 2010
i want to binding excel data to a datagrid without no header, just the data.for example :my excel files consist of 3x3 matriks data in 3x3 excel cell like this
1 2 3
4 5 6
7 8 9
and i want to show all this data on data grid i have tried with some code like this
Dim MyCommand As System.Data.OleDb.OleDbDataAdapter
Dim ds As New DataSet
MyConnection = New System.Data.OleDb.OleDbConnection("provider=Microsoft.Jet.OLEDB.4.0; " & _
[code]....
but the first row of that data ( 1 2 3 ) is not shown up in the datagrid, just the 2nd and the 3rd row that shown up in datagrid?
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