Whenever I setup a database connection, and then drag items from it onto my forms, I get errors! 102 of them to be precise.All I've done is create a data connection, add the datasource, created relationships and then dragged items ome. I've been working with databases for a while and have never had this problem when taking these steps.
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after i drag the datagrid view from the data source windows the group of controls appear in my form does not include a binding navigator, i also dont see it in the component area.
but when i try the example from northwind database after i drag datagried view it already have a binding navigator. why my own project dont?
EDIT: im able to figure out about this 1st question, just a little bit of exploration , i just add the navigator control from the control toolbox. then set the binding source. ^^,
question 2: when the binding navigator is now available.
when the navigator is already now in the form i will set the visible property = FALSE.
i will make a control button that will serve as "Save and Addnewrecord" that will save the data (from the text box )and save it to the table and add new record read to accept new data.
I'm trying to make my datagrids datasource change when you select a particular item from a drop down menu but all I get is blank cells! any ideas? I don't think it is changing the colums property automatically either.
If chooseType.Text = "Add / Edit Players" Then
updateDB.DataSource = PlayersBindingSource
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I had a DataGridView that was bound to a Table in my typed DataSet. I recentyl added a new column to the table in the database and updated the table in the DataSet accordingly.Now, when I go to the DataGridView to update it, the new column does not appear under the "Databound column" list. I tried setting the data source to "None", then reselecting it. Still, it does not show the new column. I then deleted the DataGridView and re-added it to the form. Again, same result. However, when I select the data source, then click "Preview Data", it show the added column.
View 2 RepliesUsing Access I created a few Data Access Pages. These web pages, once opened, work fine to manipulate data as intended, but they keep generating annoying warning messages.There are two messages that pop up every time the web page is accessed. Before the page opens the first message that pops up states: "This website uses a data provider that may be unsafe. If you trust the website, click OK, otherwise click cancel."After pressing OK on the first, the second message pops up and states:"This website is using your identity to access a data source. If you trust the website, click OK, otherwise click cancel."After pressing OK on both messages the page functionality works just fine.I've tried adding password protection to the database and even signing the project with a digital certificate, but I still get the warning messages. This would be fine except there are multiple end users for the access pages and I am trying to avoid the additional confusion this will create, especially since IT has restricted many of the users from editing the internet options.
View 1 RepliesI am writing a simple app using Visual Basic 2008 Pro, and SQL Server 2005 as the backend. However, I copied the database file (.mdf) from another computer onto my laptop. I added it as a Data Source by having the Data Provider as "Microsoft SQL Server Database File" and have it attach the file to the local SQL server. However, it isn't set to copy the database to the output directory every time the program is run for debugging, as I thought that would save time.
Now however, the data update to the database are very wierd. I run the program, add some new data, save it, and it returns the new primary keys properly (that is, it turns from -1 to 4 or 5 or whatever, indicating that the data has been saved). When I close and re-run the application to check that the data has indeed been saved, it reflects the changes and shows me the new data. However, when the program is run again after some time, the changes I made are gone. I'm assuming this is due to some wierd way in which VB is updating the database that temporarily updates its cached or copied database, but doesn't actually change the real database. How do I fix this? I had previously done the same project on another computer, except there the data source was directly the local SQL server, and I had created the database directly on the server through Visual Studio itself, and I didn't face those problems then. Is there any way to manually attach the SQL Server database file (.mdf) to the local SQL server instance permanently, and change the app to use the attached database instead?
I have an "Object reference not set to an instance of an object" error that does not make any sense.I have a form with 2 datagrid views, (dgv1) and (dgv2).During the form load, I load the data for dgv1 and dgv2 without any problems. After the form load is complete, I get an error on the follwoing code.
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the user has the option of dragging several pictureboxes around the form. when he lets go of the mouse, the picturebox will take on a new position on the form.
i would like to implement the following:
on mouseup, if the picturebox position is within some amount maybe 50 or 100 (i dont know what units VB.net) uses, i would like it to be dropped exactly in a defined position. sort of like if you play checkers on yahoo games, you dont have to place the piece exactly on the square only approximately.
Been a while since i've bothered you gentlemen with my questions, but im back! So, I want to know, how I would be able to drag a picturebox around a form, liek a drag and drop functionality, but I dont want to move folders. Just move it around the form.
View 4 RepliesAfter maximizing a form, if I drag the title bar, the form moves out of position. This seems to be normal in windows, since IE does it also, but can I disable this? so the form stays fixed and unmovable?
View 1 Repliesif i add a panel1 how would i drag the form about by dragging the panel i have this code from VB6 and i have tried upgrading it in visual basic 2008 (that never seems to work :|)
View 2 RepliesI have made a borderless form, but i still wish to be able to drag it around the screen.
But i dont have a normal background, ive got an image that covers it. I wish to be able to drag this overlaying image around the screen. Ive found code examples that allow you to drag the form, but you have to acctually drag the form.... Not the image (i couldn't adapt any of them)
How can i disable a user from dragging a form , with using form border style (None). I want to use a fixed singl border style.
View 3 RepliesI'm currently using VS2008 and VB.NET.When I attempt to populate a Queue that has not been instantiated with objects, the program simply hangs without throwing an error.I have run into this issue multiple times in different parts of the program in the past few days.What could be the cause of this?
Here's the code:
Structure ConsoleBufferLine
Public EntryDate As Date
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Is there a way to disable a user from dragging a form other than setting the form border style to "None" ?
View 8 RepliesIf I drag another Form/Program or maybe lets say a context menu happens to open over my custom Control, this happens.It does correct itself after causing a redraw, however it's quite annoying. Is there anyway to avoid this?
View 5 RepliesIs there a way to move form by pressing and dragging a mouse on any part of the form ?
View 3 RepliesDragging ListViewItem To Windows Explorer to copy file but it copies to form
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I use vb.net and windows form and sqlserver
I added Data Source(Microsoft SQL Server (SqlClient)) to my project. and now I need to change it to ODBC Data Source .
i have 3 Combobox and 1 Bindingsource in my form, i want to add the Bindingsource to the combobox's datasource like this
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So i want to ask if someone can help me make the 'DataSource' member of 'System.Windows.Forms.Control' or are there any other way to add datasource for all the comboboxs without manual adding each one.
I have a form that with a list of text boxes. My target is simply binding these controls to an XML file so that whenever the file contents are changed externally, the text box values change dynamically. I will have an external application edit the XML file and overwrite the existing one.
View 3 RepliesI'm creating a dynamic combo box and adding to a form. I'm trying to fill the combo box with a DataSource from an ArrayList and then selecting an item in the combo box based off a value from a property.Problem is, the combo box items don't get bound until after the Form_Load event has finished and the form is visible. So the combo box is empty when I try to set the selected index of the combo box. See code for what I'm doing in detail, and refer to comments in
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How to select the right selected index for combo box without a hack (Load timer or something stupid like that)?
I have checkedlistbox on my windows form which is binded to datasource,I do check the items in checkedlistbox based on some criteria,When user uncheck some items I want to save the records, but in Checked Items collection still I'm getting items as checked, which are unchecked. checked list box still remembers the previous checked items
View 5 RepliesUsing Visual Studio 2010 I am trying to using windows form drag and drop by datasource .the grid generate automatically and with navigation bar with few controls like add, save , delete.But its not work on main table , meanS When I want to add new , it show saved but its not saved in actual datatable.
Public Class Form1
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
'TODO: This line of code loads data into the 'Agents_DataSet.trans' table. You can move, or remove it, as needed.
Me.TransTableAdapter.Fill(Me.Agents_DataSet.trans)
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I have a small program that contains a webbrowser object, 2 labels, and 3 listboxes. For some reason, whenever I try to hit Debug, it gives me the following error:
System.InvalidOperationException was unhandled
Message=An error occurred creating the form. See Exception.InnerException for details. The error is: Object reference not set to an instance of an object.
Source=Test3
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I have a base form and I am trying to get the DataSource of the ActiveControl if the control is a datagridview.What I have so far is:
Dim curControl As Control = Me.ActiveControl
Dim ControlType As String = curControl.GetType.ToString()
If ControlType = "System.Windows.Forms.DataGridView" Then
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During Loading a form, I bind a datasource property of the DGV to the bindingsource, and then set the fillweight property of the DGV columns. But, after form being shown, earlier set properties are being reseted to default = 100.
The procedure is like:
1. TestForm.Show()
2. TestForm_Load(...) Hnadles MyBase.Load
DGV.DataSource = bindingsource
DGV.columns(0).fillweight = 80
DGV.columns(1).fillweight = 120
3. Me.close() (Closing the form which called TestForm.Show()
And now I have visible a TestForm with well binded datasouce seeing all the columns, but their fillweith property was beeing reseted...
My form closes whenever I insert an object that has a data bound in it. The object I'm trying to insert is a textbox from the data source window (drag n drop). I've checked on the database and that the table has records in it.
View 1 Repliescopy a form without getting Duplicate reference errors that you would have to fix.So This is what i did and i felt i should share it now that i figured it out
File > Export Template > Item Template > Select Form To Copy
Then
Solution Explorer > Right Click on project title > Add Item > Select Exported Template > Rename file > Add Item
I just noticed this, but I had a for loop where I incremented beyond the number of elements in an array. Normally this would thrown an exception.
This was in a form load event, and all that happened was the rest of the code in the event never executed. If I wasn't looking for what was supposed to happen next I never would have known there was a problem!
There was no try catch block there... but I would think it would still stop program execution with an error.
Can anyone explain this? Do I have some stupid skip error checked somewhere (if this exists, I'm going to be really annoyed)? In a button click event I put the exact same code and it threw the error... it seems to just be a problem with a form load event.
My IDE is VS2010 professional (vb)
