i have a datagridview with a column with comboboxes. My problem is that the changes that i am doing from comboboxes didn't occur to datagridview immediately but after the user click to another cell.
View 1 RepliesAs part of a user interface I'm designing, I'd like the user to encounter the following: when the user wants to edit a value in a cell, the cell in the DataGridView is replaced by a DataGridViewComboBoxCell. This is working now, however, when the user enters the cell (edit cell) the edit cursor stays there, and the combobox won't show. When the user leaves the cell, the Combobox shows, and after again entering the cell and clicking on the combobox, the dropdown finally shows. So 6 clicks are necessary, and I'd like to reduce this to a maximum of two clicks.
Using VB.Net on Visual Studio 2008, with .net 3.5
This is my code:
Public Class Functions:
Public Sub ComboBox(ByVal source As System.Windows.Forms.BindingSource, ByVal MainView As System.Windows.Forms.DataGridView, ByVal valuemember As String, ByVal displaymember As String, ByVal row As Integer, ByVal column As Integer)
[Code]....
I have a vb.net window app that has a number of combo boxes on it. These are being populated from a number of XML files and all this works like a charm. The problem i have is when it comes to putting the comboboxes in a datagridview. I have set up my columns and have set the first column to be a combobox but i'm having problems referencing this so that i can set the datasource to populate it.
I've looked everywhere but cant seem to find how to reference this control. Once this has been selected it will populate a second combo box based on the data from the first. I think i can sort this out, if i could only work out how to set the datasource of the first combo programatically.
What I want to do is use two drop down comboxes (Comboboxes 1 & 2)in tandem in a databound datagridview.Both comboboxes are bound to tables in an SQL 2005 database.By this I mean select an item in combobox 1 and have its display member appear in that combobox.This is usually text.The value member for combobox 1 to be displayed in the combobox 2 which is also text.The value member from combobox 1 has identical values to the display member of combobox 2 in the database tables.If I need to change the display member in combobox 2, as all situations have their exceptions, I want to do this without changing combobox 1.The value member for combobox 2 is numeric and is put into another cell in the DGV for carrying out calculations.I have managed to get the display of combobox 1 working on its own and ignoring the value member.I have done the same with combobox 2 and have the value member working correctly.
Can databound comboboxes be used in this manner or will VB.net not allow this type of operation.I have not done this with any code. I tried to get my required operation through the edit facility in the DGV.When attempting to run the program, it does not compile and throws an error which basically says "You have done something wrong.Sort it out."Typical Microsoft help! Can it be done using code in the datasets or binding sources?
I have problem with a datagridview with combo boxes firing unwanted events handlers.I have a datagridview with 4 columns all data bound. All of these columns have comboboxes. Column 2,3,4 has a custom generated combobox with code with on the 'DataGridView_EditingControlShowing event' and have event handlers (Dropdown,selected Etc). (Data in the custom generated comboboxes needs to be filtered and worked on)
[Code]...
I have three comboboxes in a form. The first is the parent of the second, which is the parent of the third. When they are all updated, a datagridview should be updated.
The problem is that the user can choose to change the value of either combobox, so I don't know which combobox's value is being changed. Therefore I now update the datagridview from the third combobox's selectedvaluechanged event. This unfortunately means that if the first combobox is changed, the second and third comboboxes selectedvalue events must trigger. As a consequence, when the first combobox is changed, the datagridview is being updated about six times (which doesn't work for me performancewise).
What I'd like to do is to call the updatedatagridview sub from either one of the three comboboxes, but only if the user has chosen to change that specific combobox's value (that is, get the form to only update the datagridview when the selectedvalues of all three comboboxes have been set).
I have a form that lists all of the clients in a DataGridView and when I click on a column that is a Link I want the data to populate into the form I use to capture. My problem is that when I click on the link all the TextBoxes on the form are filled correctly but my ComboBoxes are not.[code]
View 1 Repliesi've uploaded in SkyDrive my project to give a better picture of my problem:
Cascading Combobox works just once in _SelectionChangeCommitted,
and, DataGridView do not follow 3rd Combobox filter
[Code]...
this is a subset of a previously posted problem, I have narrowed down my issue and am reposting a question from this thread: [URL] I have apparently confused the compiler by renaming some comboboxes in Visual Basic .net express? (See relevant code below) I think the confusion is in who should handle what, with two routines named with variations of ComboBox1 and one handling the other ( it confuses me just trying to interpret it mentally):
[Code]...
I have a form with 4 comboboxes and a button. The first combobox is enabled, but the rest of the controls are disabled. When the form is opened I fill the first combobox (cbxMethod) with a datatable. When the user selects something in cbxMethod the next combobox (cbxStudy) will be filled and so on. When the last combobox (cbxAnalyte) has a selected value I want to enable the button and give it focus so the user can move forward with the program. I basically want to force the user to move from one combobox to the other, until all are filled.I am currently using the SelectionValueChange event, but this event only fires when the user changes the value with their mouse or hits the Enter key, not when the user hits the Tab key.
Public Class frmCalculatedAnalyte
Private cv_dt As New DataTable
Public Sub New()
[code]....
I've uploaded in SkyDrive my project to give a better picture of my problem:Cascading Combobox works just once in _SelectionChangeCommitted, and, DataGridView do not follow 3rd Combobox filter?
View 2 RepliesI'd like to create a data bound comboboxcolumn off of the distinct results of a view in my database. The view returns tablenames within the database which do not already have an entry configured. I use this as a entry to tell a purge application how and what tables to purge.Setting up this combobox proves to be a little more difficult than I imagined because my view pulls from informationschema.columns in the master db and therefore is unrelated in the 1:M traditional scenario. So as a result my displaymember and valuemember get the same field unlike most examples I see where some integer or enum is the backing value in the valuemember. Not the case here.
When I put all this together and run the code I do have choices in my drop down list but the current cell is blank. What is going on here?..create column
Dim Tablenamecolumn As DataGridViewComboBoxColumn = New DataGridViewComboBoxColumn()
With Tablenamecolumn
.Name = "DBTableName"[code]....
If I change things around a little bit and I get an argumentexception telling me that "DBTableName does not exist".I have one query that on startup calls for all my entries in purgeconfig table and it contains "DBTableName". Then I have another query which returns me a single column with many rows and a different field name and that's what I am using for the column's datasource. I can manipulate that query to change the column name to match "DBTableName" that the other datatable has, yet it still doesn't work. Do I need to create a data relation or something between them? Why aren't they wiring up?
The only way I can make my code work without the argument exception is to refer to my combobox with the field name of the column coming out of my View. Anytime I start using the other column name it throws the argument exception.This isn't the only column i'm going to need to do like this and i've spent a lot of time trying to figure out what i've done wrong and why it doesn't display the current value in the cell, only a blank cell insteadl.
I have had absolutely no prior experience in any programming whatsoever. Yesterday I downloaded the visual basic 2008 express edition from Visual Basic 2008 Express Edition.
I have a small question which I am sure is very easy for somebody else to answer and I apologise in advance if this question is in the wrong section.
I wanted to make a small exe to autorun from a cd. I want to be able to hand the cd out to friends and family. So far I have achieved what I wanted with the little app. On the cd I have an exe file in a particular folder that when clicking a command button on a windows form - I would like to run this exe. At the moment I have:
Private Sub Button5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button5.Click
Shell("explorer.exe ..appfolderapplication.exe")
End Sub
This finds and selects the application as required, however It does not run it. Another box comes asking me "Do you want to run or save this file?" If I click run, another box comes up "The Publisher could not be verified, are you sure you want to run this application?"
what code to I need to enter or change to make this exe run immediately as if I were the same as browsing for it and double clicking on it?
My Asp.net Session Expires immediately even though i did the settings in web.config file,
<system.web>
<sessionState timeout="2880" mode="InProc" cookieless="UseCookies"></sessionState>
<customErrors mode="RemoteOnly"/>
[Code].....
i did above settings in web.config even then it expires after approx 3 minutes..
see below program. I start a new thread x with function abc, then I do some longer task.
Why does x only start after end sub? Shouldn't it start right-away, before sleep ?
[Code]....
I have an issue with VS 2008 datagridview combobox control.
The combo box in question closes immediately after the CellValidation method that I wrote invalidates the input in the combo box cell. What I mean by closes immediately is that when the drop down arrow is left-clicked, once I remove my finger from the left clicking of the mouse instead of staying down so that the user can see the selection options the combo box just closes.
I'm currently using EditOnEnter as my EditMode style. (I've tried switching between the different option the same behavior exists). The datagridview is bound to a dataset which was created from my database in MS Sql Server 2005.
This problem exists on two different forms and occurs exactly the same way. I don't know what other settings to mention to help in the troubleshooting of this error, but please feel free to ask me any questions so that I may resolve this issue. By the way both forms use datagridviews tied to the same dataset, just different tables and table adapters.
Can anyone tell me how to kill a thread immediately.
I have tried MyThread.Abort, but it seems to do nothing. Someone told me it's because 'Abort' waits for the current operation to complete, but my thread will run for over 30 minutes before that happens.
I don't like the verbose way of adding DataRows one by one via Tbl.Rows.Add, so i've created this pseudo LINQ query that does nothing but adding rows implicitely:
Private Function GetData() As DataTable
Dim years = {"2010/2009", "2009/2008", "2008/2007", "2007/2006", "2006/2005", "2005/2004", "2004/2003"}
Dim tbl = New DataTable
tbl.Columns.Add(New DataColumn("Year"))
[code]....
As you can see i don't need the result of the query at all, it's only purpose is to iterate and call DataTable.Rows.Add. So the result is already available in the DataTable itself and not needed from the query.Admittedly this question is somewhat hyphotetical because there would not be a big difference in using f.e. ToList and normally a query's purpose is to return something.But anyway, what's the cheapest way(in terms of memory consumption, execution time) to execute a LINQ query when only the execution and not the result matters?Edit: Ok, thisquestion was a quick-shot and a chicken-and-egg problem. I wanted to reduce 20 lines of code to a single line but noticed that i need some kind of DataSource for the LINQ-Query. Therefor i've created the Array. But at this point i could have simply used a for-each loop as well to add the DataRows.
Conclusion: Use a LINQ-Query for what it's for: a query. Then this question is pointless since there is no cheapest way but only that which returns the correct result.
I have the following code running in a thread to enumerate the local machines in the active directory. This takes some time to complete (about 5-10 seconds) so if the user quits the application before the enum is complete the application takes 5-10 seconds to quit. I tried thread.abort but because it is waiting for For Each SubChildEntry In SubParentEntry.Children to complete it doesn't abort until this returns.
Dim childEntry As DirectoryEntry = Nothing
Dim ParentEntry As New DirectoryEntry
ParentEntry.Path = "WinNT:"
[code].....
I have an application where I provide e-mail notification that a task has been completed. The e-mail works okay except that it is not sent until the user quits the program or sends a new message. Is there a way to force the e-mail to send immediately?I'm using Visual Studio 2008 / Visual Basic
Dim ToEMail As String = email_address
Dim FromEMail As String = email_address
Dim EMailAddr As New MailAddressCollection
[code]....
I have my form checked if it's dirty when a user goes to close it. If its dirty is true, the user is asked if they would like to save the data. When they click yes, the 'save event' is called. The problem I'm having is trying to get the form to completly close after saving. At the end of the save I put in me.close(), but another form closing event is triggered. Is this the correct way to dictate having the form close immediately after saving the data or is there a better way? If it is, I must have it placed in the wrong part of my code. Immediately after the "success" dialog box is displayed, I am asked if I want to save the data again.
[Code]...
I have to Repositon many TextBox in a form, but when I use Refresh() to invalidate its client area, that TextBox's Text will be disappeared until I focus to that TextBox. Are there any way to make the Text appear immediately after Refresh?
View 1 RepliesI'm having a strange problem with the following code, I'm writing a game launcher in VB.NET:
Dim gameProcess As Process = New Process()
gameProcess.StartInfo.UseShellExecute = False
gameProcess.StartInfo.FileName = TextBox2.Text
[Code]....
I see the game running for a split second in the task manager, but it immediately closes! Does anyone know why? When I run the game from Windows, it works fine.
I've also tried with Shell, same problem.
And I've tried with cmd.exe and the /C argument, same problem (note that when I type cmd.exe /C path_to_game_exe in the Windows Run Dialog, the game also starts fine), it's only when I launch it from the VB.NET app that it gives problems.
I am trying to end a program immediately when a critical exception is caught. But I am finding that code after my Try/Catch block is executing even though the code withing the Catch block is executing, and that Catch code is calling Me.Close.
I suspect it has something to do with background .net threads or something, but I have no clue how to deal with those kinds of issues. How can I stop the program as quickly as possible? If code after my Catch executes, it will (and does) throw lots of uncaught exceptions later. Currently, it is not feasible for me to try to catch all the other exceptions. I just want to report an error and end the program.In my form load routine, I create and set up a number of objects and arrays by calling various subroutines.The success of most of the subroutines depends on the sucess of three subs in particular, which are called early on. If one of those three fails, there will undoubtedly be a number of hard to trap exceptions later on in the load routine.
[Code]...
I have an OleDBDataAdapter which I am using to communicating with an Access database. I have generated a SELECT command with parameters, and used this to generate a DataSet.I have then used the OleDbCommandBuilder to generate the UPDATE and INSERT commands. I can use this successfully to fetch data and then update it.
Next I have created a I have a DataRow using DataSet.Tables.NewRow which I have populated.I have then used my DataAdapter to insert this record.This works just find. I would like to now update this DataRow.Can I refresh this DataRow so that it populates the fields such as the autonumber field and the automatically populated timestamp? I could select it again but I don't know the autonumber. Is there not some way that I can get the existing DataRow to synchronise with the new row?
I have the most puzzling problem with VS2008 in regards to debugging my programs. Until recently I have been coding in VS2010 but due to some other system requirements with my work issued PC I have moved back to VS2008.All apps I developed in VS2010 always have and continue to debug as expected. However, any app I write in VS 2008 and try to debug, the application immediately ends before the first form is loaded. Again, if I run the same code in VS2010 I have no problems. I did notice the other day that if I debug without being connected to my corporate network, I can debug in VS2008 just fine.
View 7 RepliesI've deployed an application inside a corporate network and I want the update process to require less attention from users. Giving them a choice to update is not a porogative.I've written code to detect when new updates are available automatically rather than letting ClickOnce check on application start. I'm wondering if its necessary to restart the app after the update has completed. Currently I invoke at the end of my update script:Application.Restart()
But what if (to make the update process more transparent for the user), I performed a 'silent' update in the background on a separate thread, and then displayed an icon prompting the user to restart the app to apply the changes? Would it work this way?
Furthermore, if I ran my custom InstallUpdate() process on a timer, say every 2 hours, would ClickOnce be happy to continue to update for every new version that was released even thought the user has not restarted (and I'm expecting the updates only to apply once the user restarts the app)?
i am trying to make a app that loads a keyboardhook from a module on startup,
but unless i load the keyhook from the form the app just closes immediately.
i uploaded the keyhook module, to test it just start a new project, add the module,
to test it loading from the form just put hookkeyboard in the form load,
but what im tyring to do is have the module load first, so set the start up object to sub main
what this is suppose to do right now is just send a msgbox on every keystroke, it works from the form load but fails when loading from module, unless i am always typing something.
I ran out of ideas and couldn't find any reference about it so here I go... I need to keep a secondary application wich is not related to my c# project always running in background. So if this secondary application crashes or someone else close it manually it will automatically re launch again via my c# app.
I have no clue of how to accomplish this one, I mean checking if this application closes by something external to my c# app.
I've made a windows form in which I can change names in my databasetable 'stations'. To select which station to change I've used a databound ComboBox which gets all stations from the database table.
Now when I change the name of a station I want to get it immediatly updated in my combobox without restarting the application.