I think I started out with a misunderstanding of what happens with addnew() and canceledit().
I have a strongly typed datasource in memory.
I call bindingsource.AddNew()
Later I find that the record the user was trying to add already exists, so
bindingsource.CancelEdit()
I have not set any properties other than datasource on the bindingsource.
My assumption was that the CancelEdit() would rollback the blank row added by the AddNew(), but I'm getting some odd errors which lead me to believe this is not true.
Could someone verify that CancelEdit() leaves the new row?
I have a problem with bound controls and a bindingsource. I'm using vb 2008 and .net 2.0.I have a few text boxes bound to columns in the binding source.The backend is a Access database.
I'm using a bindingnavigator to add a new record.The additem event works fine.If the user clicks an icon to cancel edit, the code executes bindingsource.canceledit. This seems to work fine. The row count on the navigator returns to the correct number before the addnew event occurred. However, the bindingsource seems to have an empty record in it. As the bindingsource navigates, it eventually gets to the empty record depending on where it's position was when the addnew event fired.
The error received is an invalidcastexception. This error occurs because the record is repostionedand each time this occurs the code performs calculations using values from the bound controls.But when it navigates to the empty record, the values in the bound controls are null.Is there other code besides canceledit to remove the empty record?
Basically I try to get a DataGridView and a BindingSource working inside a class. I define them by:
Dim TempDGV3 As DataGridView = New DataGridView Dim TestBinding As BindingSource = New BindingSource
When I manually add columns to the DataGridView, it works perfectly, but when I set it's DataSource to a bindingsource from a base class, it doesn't load data and keeps throwing 'object does not exist' errors. The bindingsource mentioned here did, however, work on other DataGridViews that are defined in the base class (and implemented in the form to which the base class belongs)
Same for the BindingSource(not the above mentioned, but the one I try to create inside the class in the beginning of this post). I try to use it in the following way:
But the BindingSource keeps returning 'Nothing' for it's datasource and basically doesn't work. However, the SourceDataGridView mentioned here gets filled with 63 columns with "AllowUserToAddRows" and other properties when the columns names are asked.
So my question is: how do I get the BindingSource and the DataGridView to work in this class? I'm getting the feeling I'm missing out on something very obviously here. If that's not the case, I can report back with more code?
have a query in SQL, returns the results I expect, however when I copied this query to a bindingsource.filter call,I get "Missing Operand" errors
Me.ItemsBindingSource.Filter = String.Format("SELECT * FROM items WHERE (GETDATE()) BETWEEN (items.ItemStartDate) AND DATEADD([month], items.ItemOccurances, items.ItemStartDate)")
I'm using a SQL Server database and a bindingsource, and i want to filter a numeric field in order to, for instance, when I write 1, the grid shows all the rows in which that field begins whith 1 (1,10,14...). In order to do this, I have to convert the field to varchar, but VB shows an error message when using cast or convert functions. I have this sentence in my
Private Sub BindingNavigatorRevertItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BindingNavigatorRevertItem.Click Me.GpheaderBindingSource.CancelEdit()
[Cdoe]....
My problem is Me.gpdetailbindingsource.canceledit() cancels only the current row being edited. I want all rows of my detail be reverted.
I am having trouble figuring out how to get my function (lines 45-57) to work. Option Strict is supposed to be on. I am getting the error "Option Strict On disallows implicit conversions from 'Decimal' to 'String'." This is an intro problem so its going to be basic. [code]
I expected the "Left" function in the code below to return the letter "A" but it returns nothing? Also, as a further test, Left(CP, 3) returns nothing?
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I was wondering if there's something I haven't imported or if perhaps 'right' is an obsolete function that was used in VB6 but replaced with something. The code I have is as follows:
I have an image with a button for zoom on it. I want to zoom-in and zoom-out the image with mouse scrolling up and down, right and left. Can anyone help me with some example to understand how this can be done?
I'm using some functions which can be compared to encoding/decoding, but it's a really simple and basic application, not really an encoding function.The problem is, the decoding function doesn't seem to work. For some reason, it doesn't work correctly, and I'm a bit stressed, so even after searching for a while, I can't seem to find it.[code]
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VB Dim strString As String Dim strString2 As String Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Dim strString As String
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Vb For Each MemberALister As MemberInfo In _Listemember If Me.Girl.Checked Then If MemberALister.Nom.Contains(Me.Genre.Text) Then
I'm doing a baseball program for a class project. And I almost have it complete, but it's giving me a syntax error. I can't figure out what i'm doing wrong. I'm using two functions to return a value for different type of baseball tickets to the button that calculates them. Here are the instructions 1.)User selects whether to purchase season tickets or single-game tickets 2.) User enters the number of tickets needed and the type of seats based on whether they selected season single-game tickets.3.) User clicks the Compute Ticket Cost Button to display final cost4.) User clicks the Clear Form button to clear the responseI just can't figure out what I did wrong. I know it's something stupid that i'm doing.the errors are happening inside the btnCompute sub routine. with syntax erros on SingleGameCost() and SeasonalCost() line 114 and 118
Public Class Form1 'Global Variables Dim intTicketChoice As Integer
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Maybe i'm missing something, but how can i make my application to save the value that i use to replace the null values that exist in the database?Let me explain i have a form with several textboxs to let the user enter/edit some data. At the first time the user opens the form, the are some fields in the database that are null, so i use one of the overloaded versions of the control.databindings.add(), and set default values for those fields.
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On the form I have a listbox and a textbox with the following properties set
I am having issue with this function where wait_rtn statement does not work and errors out with error 0. it is suppose to search the screen and if it finds (true) get out of the loop...