VS 2008 Access To DataGridView For Logic Operation?
Nov 22, 2009
I have created a DB connection, loaded my data grid and am looking to perform accumulation on the salaries that are shown. However it won't give me access to my grid view or the table for the Row.
This is the code that I have. The loop and the accumulator is at the bottom.
If rdoFullTime.Checked = True Then
'Dim con As OleDbConnection = New OleDbConnection("Provider=Microsoft.jet.oledb.4.0;data3
[Code]....
I tried to dim the Row as myDA.Row and myDataSet.Row and it won't allow me to and I can't figure out why. I know this deals with database but the problem is the logic not the database.
The application uses ADO.NET to invoke sprocs for nearly every database operation. Some of these sprocs also contain a fair amount of domain logic. The data access logic for each domain entity resides in the domain class itself. ie, there is no decoupling between domain logic and data access logic. I'm looking to accomplish the following:
We have a system were a user chooses a combination of days from a calander. We then insert a values in the databse based on the following [code]So if they picked Monday and Friday we would insert 34, or if they picked Monday,Tuesday and Thursday we would insert 22.Now my question is how do I reverse this easily in code, to find out what days they have picked. So I get fed 22 from the database how do I figure out what combination of days make up that value. The only thing I can think of is creating the mother of all case statements but I know there must be a better way.
I am working on win32 application using Visual studio 2010 and Windows 7. Whenever I Click to "ADD" a "resource" to the project, I come across a messagebox with an error.. "Operation could not be completed. Access is denied".
I have an application that I need to automate where at a certain time each day, say 6pm, it will run a certain method(which is to check a database for key terms and then access the api to search for these terms). But there is the main process which is running all the time accessing the stream api so when the search is complete, it interrupts the stream and hands over the new terms. Now I thought of adding the .exe file to windows task scheduler but not sure if that would work. The stream method runs indefinitely and at 6pm each day another process needs to run. I thought of using the system.threading.task TaskFactory but I am using visual studio 2008 ( I do have .net framework 4.0)If it launches using the task scheduler as 6pm with my code logic as follows:[code]
I see how this would eat the CPU...the streaming process is basically following a list of user profiles listening for new activites and storing these as XML files. This a real time feed to an API. At a specific time once a day, a second process needs to go access a database for new ids, and if there are new ids, then go to a search API and get new user profiles. This is the main criteria..once the new user profiles are found, the list that the stream users needs to be updated so the process will be interrupted for a second or just paused and then continue processing.
I am working on a VB.NET project that grabs data from an Access DB file. All the code snipeets I have come across open the DB, do stuff and close it for each operation. I currently have the DB open for the entire time the application is running and only close it when the application exits.
My question is: Is there a benefit to opening the connection to the DB file for each operation instead of keeping it open for the duration the application is running?
I have a datagridview on a form which is populated with data from our backend database. A few of my users are experiencing a problem when they select all the cells in the datagridview and try to copy and paste the contents into something such as Excel.
The error is: Requested Clipboard operation did not succeed.
Having searched for information on this error it appears that if a process has the clipboard already open (such as office) this will cause the exception being thrown (which is a system.runtime.interopservices.externalexception), usually when the code calls the clipboard.settext method (which I do not). However my form and its code does not even contain anything to do with clipboard manipulation, copy and paste or anything remotely to do with using the clipboard so I am unsure as how I can actually catch this exception and just report back to the user?
working with DataGridView and MSAccess. I have 3 combo boxes that will give me the search data to use to fill in the DataGridView box. I am only showing 3 items in the DataGridView. Can someone lead me to some code I can use to help me setup the query or code I need to fill out the DataGridVeiw box based on the 3 items I have.
I have a DGV which is part of an inventory system. I have several columns but the ones i need to resolve are Quantity, Name and Plural Name. essentially if quantity is 1 i need to display the Name data if greater than one the plural data. Is this possible? would i need to resolve this earlier in the process (the data is extracted from an xml file using LINQ to bind it to a rowObject) or can i do this with the completed dataset, say by hiding the Name and Plural Name colums and creating a custom column? ideally i would like to keep the data untouched.
currently i am working on a project in which i am using datagridview control. if I enter key value in cell than remaining data of that particular row fetch automatically from data base. how? how to delete as row in datagridview? how to update a row in datagridview?
I have a datagrid view that displays information from a table. Changes I make to the data grid view are not saved. I have a button called btnsave but I have no idea what to put in the click event to save changes to the DB.
vb Dim ConnStr As String = String.Format("Provider=Microsoft.Jet.OLEDB.4.0;Data Source={0}", DataDir) Dim conn As New OleDb.OleDbConnection(ConnStr) Dim sql As New OleDb.OleDbCommand("Select * FROM USERS") Dim dt As New DataTable [Code] .....
I have a dictionary (literally) database file in Access: its Fields are Headword (string) and Definition (Memo, it's in Rich Text). The Rich text looks fine in Access, but when I connect a Visual Basic (2008) Datagridview control to the database, the text looks like HTML, not RTF, and when I try to copy a specified "definition" into a RichtextBox, I get the same weird symbols, not RTF. One attached snapshot is how a record looks in Access, the other in a VB 2008 form with a datagridview control and an attempt to paste contents into a RichTextBox.
How can I get that same "look" from the RTF in the original Access file? I'm only recently moving from VB6; not a professional
I have a datagrid with a lot of column, but only a few group of it can be edited by user.On a CellEndEdit event i update automatically the database with the new value when the user modify one cell and then I must recharge the dataset of the dataview.If I modify a cell and then use tab or enter to move to the next one everithing is ok, but if I change a cell and then mouse_click on another one i get thi error when i recharge the dataset:
Operation is not valid because it results in a reentrant call to the SetCurrentCellAddressCore function
I am trying to move from the old ADO to the new ADO .NET . However , no matter how many tutorials I read over the internet , I still can't find a way to do something which , as I believe , has to be very simple I tried to mimic the way the graphic control did but I am missing some things ... I noticed that , in the graphic way , the wizard created 4 controls :- a DataGridView control- a DataSet control- a BindingSource control- a TableAdapter controlI recreated all of them and filled their correspondent properties , but yet I can't make it work . I think what I am missing is the connection itself . I looked on the internet and I think a connection can be made and opened like this :
Dim DataBaseConnectionMY As New OleDb.OleDbConnection DataBaseConnectionMY.ConnectionString = "PROVIDER=Microsoft.Jet.OLEDB.4.0;Data Source = C:ProsoData.mdb"
Dim Conn As New ADODB.Connection Dim rs As New ADODB.Recordset Conn.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & "C:Documents and SettingsUserDesktopContribucionescontribuciones.mdb" rs.Open() rs.Open("SELECT * FROM master") rs.MoveFirst() TextBox1.Text = rs.Fields("sueldoanual").Value
I have this error The connection cannot be used to perform this operation. It is either closed or invalid in this context.
i have written a code bit for Pan operation for an image in Picture box. the code bit is as follows: Public Function PANImage(ByVal img As System.Drawing.Bitmap, ByVal PAN_X As Integer, ByVal PAN_Y As Integer) As System.Drawing.Image
[Code]...
I will be detecting the mouse co-ordinates and based on the difference between the co-ordinates from the point of left mouse button click, i will be panning the image. Now the problem is though the image gets Panned, the original image in the Picturebox (PBImage) is not getting cleared.
For iLoop As Integer = 0 To length Dim byte1 As Byte = Fs1.ReadByte() Dim byte2 As Byte = Fs2.ReadByte() Dim offset As Byte = Fs1.Position() If byte1 <> byte2 Then OffSetFS.WriteByte(offset) OutPutFS.WriteByte(byte2) End If Next Arithmetic operation resulted in an overflow.
This code is from [URL], so I assumed it would have worked, but I am probably missing something simple.
[Code]....
When I run this code, I get an InvalidOperationException (cross thread operation). How can I get my progress bar on the second thread, or does it have to be created at runtime on that thread?
Dim f1 As String = "File1Path" Dim f2 As String = "File2Path" Dim Fs1 As New FileStream(f1, FileMode.Open) Dim Fs2 As New FileStream(f2, FileMode.Open) Dim f1length As Integer = Fs1.Length - 1 Dim f2length As Integer = Fs2.Length - 1
[Code]...
Application.StartupPath & "PatchData.dat": PatchData.dat isn't created yet, but my program makes PatchData.dat, and PatchData.dat is ~8KB when my program gives me this error.
I have written a simple VB.net application which saves information to an RFID tag. I am now trying to compress my data. The solution I have come up with involves bitwire operation.Basically I store 2 numbers per 1 byte (0-9, 10 being a period, 12 possibly being a negative/positive flag,13,14,15 unused as of yet).The code I am using basically shifts the byte containing a number left, 4 spaces, then 'OR's it against another number.Therefore 12 is now represented as 00010010. The problem i'm having is decompressing. Obviously getting the '1' back is easy, as I just shift right 4, then grab it. I need to append or remove the last 4 bits.My solution after many headaches was to reverse the bit order, shift left 4, then reverse, then tostring it.
I have a loop the iterate in my ListBox and I got this error. Cross-thread operation not valid: Control 'ListBox1' accessed from a thread other than the thread it was created on.
Here is my codes:
Private Thread As New System.Threading.Thread(AddressOf myFunc) Sub myFunc() Dim i As Integer
[Code]...
My Listbox1 is contain hundreds of lines to loop..thats long iteration. and i need the main form keeps responding from other function even loop is under process. This time i need to use this method of multi-threading.
Im trying to work with threading on a project im doing but i have run into this cross-thread problem, ive worked with background workers before and never had this issue.ive done some searching and found some good threads this one in perticular[URL]..now i tried to use these examples and i made it work on a differant project but i cant seem to get my head around how to make it work on this project.
When I push in my program button which read data from serial port, then when are here not data, it write this error which stop program:The operation has timed out.When I push in my program button to read data from serial port and when the data exists there, then is all OK...Please what can I do for eliminating this message = when are not data in serial port, then I want become NO DATA and when exists data in serial port then I write this data....Here is shorted program:
Private Sub program_Load(ByVal eventSender As System.Object, ByVal eventArgs As System.EventArgs) Handles MyBase.Load Port1.PortName = "COM1"
When I push in my program button which read data from serial port, then when are here not data, it write this error which stop program:The operation has timed out.When I push in my program button to read data from serial port and when the data exists there, then is all OK...what can I do for eliminating this message = when are not data in serial port, then I want become NO DATA and when exists data in serial port then I write this data....
Private Sub program_Load(ByVal eventSender As System.Object, ByVal eventArgs As System.EventArgs) Handles MyBase.Load Port1.PortName = "COM1" Port1.BaudRate = 9600 Port1.DataBits = 8
Before, my codes are working properly.. But not..I am getting this run time error. What the error means? Operation is not valid due to the current state of the object.
