VS 2008 Datagridview Not Properly Redrawn When Row Inserted
Sep 30, 2009
I have a issue with my DataGridView. It's bound to a DataTable at form load. I have a sub wich handles data recieved from a serialport. Inside that sub I'm adding a row to my datatable. That works fine, but to make the row visible in my datagridview, I have to either click on the row, resize the form so that the DGV dissapears and then appears again, manually call DataGridView.refresh or something like that. Why isn't the DataGridView automatically redrawn when a row is added inside a sub like that? One solution is to add a timer where DataGridView.refresh is executed every second, but it doesn't seem like a good idea
How to format numbers in VB.Net. All I want is properly inserted commas in my final output. Such as: lvwItem.SubItems.AddRange(New String() {ConvertToMegabytes(CULng(LogicalDrive.TotalSize)).ToString})
I have three functions which I use to convert various numbers to MB GB and TB. I would like to have the final output number be properly formatted with commas as necessary.
Private Function ConvertToMegabytes(lngbytes As ULong) As String Return (CDec(lngbytes) / 1024D / 1024D).ToString("F1") & " MB" End Function
Private Function ConvertToGigabytes(lngbytes As ULong) As String Return (CDec(lngbytes) / 1024D / 1024D / 1024D).ToString("F1") & " GB" End Function
Private Function ConvertToTerabytes(lngbytes As ULong) As String Return (CDec(lngbytes) / 1024D / 1024D / 1024D / 1024D).ToString("F1") & " TB" End Function
i want to display the inserted row to my datagridview. how can i accomplish this? [code] NewPlaneModel dialog inserts a new record to the database.what i want to happen is when i click the OK button in the NewPlaneModel dialog, the new record will appear in the gridPlaneModel datagridview.
On my Winforms app, I have a primary form with a DataGridView bound to a database Entity datasource.
The grid is set up not to allow inserts. Instead I have a button on my form that kicks of a second dialog where the insert takes place (ie. with friendlier ui than is possible with the DataGridView).
The insert is working fine.. query of the underlying table in db shows that the record has been inserted. However, I can't seem to get the DataGridView on the primary form to see the new data just created by the second dialog.
I have read many Stack Overflow q & a's and tried various solutions to get the DataGridView to refresh to show new data.. but nothing works.
This must be a common situation ?? Can someone suggest some VB.NET code that will work ?
How would I delete only the successful inserted rows for insert and then move the non successful rows up and allow the user to correct the data and get it ready for an insert. If I dont delete the successful rows then I will have multiple inserts of the same dataRow and we dont want that! And if I don't move the data up then it will have blank rows uptop and will end the try and not insert the corrected data. You can better see what logic I am trying to perform at the bottom of my code, right after I insert into the database.
Here is my code. Private Sub btnLaserGenerateTicket_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnLaserGenerateTicket.Click 'Function declarations 'Object declarations Dim localOutputServer As SQLServer = Nothing 'Variable declarations (Form) [Code] .....
I am using VB.net (FormView and ObjectDataSource) and Sql Server 2005.
I want to get last inserted @@identity in table on FormView1_ItemInserted
Protected Sub FormView1_ItemInserted(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.FormViewInsertedEventArgs) Handles FormView1.ItemInserted
End Sub My issue is that I want to redirect my FormView to readonly mode after FormView1_ItemInserted but for that I need to show the inserted record in readonly mode and that is only possible if I get my last inserted @@identity.
I call Me.Invalidate() in the property setter of a custom control (inherits from ProgressBar) but it only causes the control to paint on screen about 1 in every 10 times (or less) whereas there are far more times that the code enters the painting routines (i.e. only on some occassions do the painting routines cause on screen changes). I am using my own Painting routines, not using ProgressBarRenderer.
On the Inherited ProgressBar I set Minimum to 0 and Maximum to 1000 and use a timer to increment Value by 1 on each tick (100ms). Therefore Me.Invalidate() should be called after every tick and hence the 'progress' of the bar should be quite smooth - 1000 small increments as it fills the bar should be pretty small changes and hence appear fairly smooth.
However, what happens is that the control only changes on screen about 1 in 10 of the times that Value changes. The control also writes the progress as a % (integer) onto its surface and each change in the % text is accompanied by an increase in the visual progress. I think this apparent synchronisation is coincidence though, since using Console.WriteLine I can see many many calls to the Painting routine but a few of them actually cause a visual change on screen.
I have tried slowing the timer down to 1000ms but this hasn't changed anything other than there are far more than 10 calls to the painting routines between actual on screen changes.
I am using PointF, RectangleF and SizeF to avoid 'rounding errors' and hence blocky progress from using the Integer versions of those structures.
There's some stuff from the Output window (using Console.Writeline) near the bottom of this post that shows that at the beginning there is 1 OnPaint per Invalidate. Later on (somewhere around 1% and 5% progress) it changes to having several OnPaint calls between Invalidates. So I certainly don't appear to be short on calls to OnPaint. I only appear to be short of actual OnScreen changes.
The Painting routines use the RectangleF structures to create GraphicsPath objects, which are used to create a Region that is then filled by e.Graphics.FillRegion.
Possibilities I can think of:
1) The painting events are too frequent to allow screen udpating, but this doesn't seem likely since 1000ms timer ticks didn't help
2) GraphicsPath and / or Region objects aren't 'precise' and hence a range of similarly sized RectangleF objects create essentially identical GraphicsPath objects (or the same problem when moving from GraphicsPath to Region)
3) Erm, not sure...
Here's the Setter code:
Public Shadows Property Value As Integer Get Value = MyBase.Value
In VS2005, I noticed that when you go from the code window to the form window, the form immediately appears, but then redraws again, and takes about 4-5 seconds to come back. Is there any way around this annoyance? Has it been fixed in VS2008? In general, has anyone noticed any speed improvements in the development environment between VS2005 and VS2008?
I'm having trouble with a football program that I'm writing. I'm finding that there is a lot of flicker coming from the program having to redrawn 36 (Australian football) small circles with numbers in them about 10 times per second (or even more) as the players move.I'm just using basic e.graphics. fillellipse.code in the Paint section of the form. I then use me.invalidate on the timer's tick routine.I haven't touched this graphical stuff for a while and I vaguely remember there being some ways to help this. There are also things like the ground which I'd like to not have redrawn because they don't have to as they don't move. I remember that you can do this but I don't remember how.
I have an unbound checkbox in my datagrid view along with other bound fields from a dataset. I do not need to send back the checkbox status to my dataset or the DB. Instead I will loop though the DGV and look for those checked and do another process with them after its done being loaded. The problem is this. When I check a checkbox, then check another, the first one goes back to unchecked and so forth, back and forth. There is no add, update or deletes needed for this DGV.
i have a windows forms app which displays a bunch of records from my sql database. when i modify records in the grid and click on save, all changes are saved EXCEPT the changes made to the currently highlighted row. they aren't written out the database until i exit the actual program, despite clicking on my save button.so for example, if i change 5 different records in the grid, and click on save, and then click on refresh to reload the data from the database, 4 out of the 5 are saved correctly, but the row that is currently highlighted (meaning, the last row i changed) still has the old data.My code for the save button look like:
Code: Private Sub TerritoryBindingNavigatorSaveItem_Click_1(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TerritoryBindingNavigatorSaveItem.Click
I'm having a hard time wrapping my head around data access in VB2010. I have properly set up a datagridview, table adapter etc... I have only 3 columns showing (out of 7 that are stored) in my datagridview (dgv for the sake of less typing).i don't show the ID column which is the unique index. It's hidden.what I want to do is have a button on each row (already done that) that, when clicked, deletes the row from the dgv AND the database. I have been able to get it to remove the row from the DGV, but not the underlying database. My background is in VB6 so i'm sort of flailing around in the dark here. I tried using [code]
I have a user control with an embeded DataGridView. I exposed the Columns property so that the columns collection could be edited in the visual designer:
I have previously made a game in VB.I have created an input app where the user types in their name.(Like parental Settings)and how long they want app to stay open.I want the input app to first execute the second app then type info into appropriate boxes.But then close app after specified time for instance 5 minsYou enter text on web via WebBrowser1.Navigate Then "GetElementById" to pick the appropriate text box to drop data into. But how can i do this on vb for another app - execute app then enter text?
I currently have a Binding Navigator inserted on a form. I also have various fields from a database which I'm using with my Visual Basic application.In my database I have a field that shows the customers id number. What I am trying to do at the moment is find a way to be able to search for a specific customer id and displays that customers information in a pop-up box as part of the program.
nserting values from a datagridview into an access db. However the values are wrong. As you can see in the code, I've made variables to check what values are fetched from the datagridview, and those values are correct. But in the db there are other values. What's going on?The thing is some of the fields are run-time-created comboboxes and there are also datagridviewcheckboxes. But like I said, the values in the t1...t7 variables are correct.
Private Sub DataGridView2_RowLeave(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) Handles DataGridView2.RowLeave Dim Monda2 As New OleDb.OleDbDataAdapter("select * from congregation", Moncon)
I am looking for a code snippet which opens a image, creates a clone of this bitmap in memory disposes this opened image so that all handles are closed.
Usually we can open a bitmap using this[code...]
the following code however keeps the Image File locked until the application is running, any suggestions how to dispose it properly. (So that no handle is left open )
Things i already tried: use dispose method of bitmap <= doesnt work (need to write implementation) Using Block also doesnt work.
I have created a vb.net program to write into msword file.I have used xslt for that.Now i have a problem of margin setting in the word file.what is the code to be inserted in xslt to set the margin of msword file.[code]
I got a textbox, listview and button. i need to get text from textbox inserted in listview by pressing a button every time i press the button i need the text in textbox getting removed. and start a new line in listview. i searched for it on the forums. could only find a few results for other versions of Vb
sometimes my application will remain running after I close it. If I check the task manager, the process is still running. Is there anything specific that could cause this, or any way I can make sure to close the program completely?
When running an executable file (written in FORTRAN) directly, there is no problem creating output text files. However, when launched from Visual Basic Express 2008, those reports are not generated. I also observe that the program launched from VB does not wait for a user prompt as it should. What am I missing?
Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click Process.Start("c:applicationpistonsimulator.exe")
the CryptoStoreTest example posted here at VBForums, I've managed to store an RSA key in the PC's CryptoStore, however I have yet to manage to use it to encrypt data. Does anyone have any practical experience with the RSACryptoServiceProvider they'd be willing to share? I usually get an exception with an unimaginative message: "Bad length.", or I get non-matching results when using the same key on the same file. The MSDN documentation is equally mysterious How do I get the maximum length I may use for the Encrypt method? MSDN mentions something about a hash's length but so far I have found no hash in the RSA algorithm...
How come when I design a form it isn't displayed properly on certain computers in the fact that buttons near the bottom go of the bottom of the window. I beleive this only happens with Windows XP however it might be due to screen resolution, I haven't troubleshooted it much.
I have a simple tcpclient/server messenger running. Everything works great, except for when a client exits the software. When someone exits, is crashes the server with various exceptions and the server has to be restarted, as well as the clients. What I am looking for is a way to properly "log out" a client BUT leave any other connected client on so that is no break in the chat. Then the person that logged out or a new person can join back in whenever they choose.
CLIENT ''CHAT SERVICE Dim clientSocket As New System.Net.Sockets.TcpClient() Dim serverStream As NetworkStream Dim readData As String Dim infiniteCounter As Integer [Code] .....
I am trying to use the Command Line Arguments during the Form_Load event to load the file a user might have selected in windows explorer.
I have set some file associations during setup, so that any ".script" files will be associated with my application. However, my application can also open other (text based) files (it's a text editor), and I would like the user to be able to use "Open With..." and select my application to open the files in my application directly.
I have to use the Command line arguments for this, which will hold the filename(s) of the selected files, correct?
So I did this:
vb.net For Each arg As String In Environment.GetCommandLineArgs() If IO.File.Exists(arg) Then OpenFile(arg) End If Next
Now, when I open a ".script" file, my application opens and the correct file is loaded. However, in addition, the EXE file is also loaded for some reason! It has opened two files, <Applicationname>.EXE and the file I wanted to open. Because the EXE file is obviously not just a text file, it just displays some random characters, but I don't want it to open that of course...
Also, if I run the application in the debugger (visual studio), it opens the <ApplicationName>.vshost.exe file... So I thought, I can check for the extension of the argument, and only open it if it is a ".script" file. BUT I don't want that! I also want the user to be able to select any file and choose Open With... and select my application. That won't work if I check for the file extension...
