I've got a custom NumericEditor control that has a nullable Decimal property called Value. When I bind a data field to Value, I'd like to retrieve the underlying Type of the data that's bound, so that I can restrict the use of decimal places if the source field is an integral data type.I figure I'd have to do this in the BindingContextChanged event, but how do I get the Type of the data field from the binding itself? My Google-Fu is failing me at the moment.
In short, I'm looking for something like the GetValueType method mentioned in the following question: Simple databinding - How to handle bound field/property change. Winforms, .Net I imagine this method would also be handy if the Value property was an Object.
I have written a .Net 4.0 Winforms Numeric Editor control (which inherits from TextBox), and I have added a Value property that is a nullable decimal type, as follows:
Public Class NumericEditor Inherits TextBox Private _value As Decimal? = Nothing
[code]....
how to get around this exception, particularly when I'm databinding a number field to a number property, and there should be no string conversion happening. (To further complicate things, I'm using a similar technique for another control where I databind a DateTime field to a nullable DateTime property, and that control works just fine.)
I have a custom control with a bindable property:-
Private _Value As Object <Bindable(True), ... > _ Public Property Value() As Object Get
[code]....
Also, here, I'm adding a handler to the DataBindings.CollectionChanged event.This is the second place that I retrieve the type:-
Private Sub DataBindings_CollectionChanged(ByVal sender As Object, ByVal e As System.ComponentModel.CollectionChangeEventArgs) If e.Action = CollectionChangeAction.Add Then Dim b As Binding = DirectCast(e.Element, Binding)
[code]....
I need the first place, because the BindingContextChanged event is not fired until some time after InitializeComponent.The second place is needed if the binding field is programatically changed.Am I handling the correct events here, or is there a cleaner way to do it?
Note: My GetValueType method uses the CurrencyManager.GetItemProperties....etc, to retrieve the type.
I'm selecting a ListItem as I add it to a ListItemCollection. Then I use that ListItemCollection as a datasource for a DropDownlist but the Selected List Item is not being selected after databind.[code]...
I'm selecting a ListItem as I add it to a ListItemCollection. Then I use that ListItemCollection as a datasource for a DropDownlist but the Selected List Item is not being selected after databind. Here is an example of the code:
[code]...
I'm trying to get this to work so I can return only a list of items, instead of a list of items and the selected value. Is there a way to make the DropDownList select the selected ListItem from the ListItemCollection (or any other type of collection)?
I am kind of an old 'newbee' at this, so bear with me for a moment. I am developing a windows forms application in Visual Studio 2010 Professional that connects to a remote database (MS sqlServer 2008 R2).To speed up development, I configured a DataSource and used the data objects associated with it. In VB6, the data source could be assigned to the data objects during runtime using a variety of different runtime database connections, ODBC, ADO, ...
I have been unable to find a similar method with the VS2010 Visual Basic DataSource and underlying TableAdapter, BindingSource, BindingNavigator, down to the individual ComboBox and assorted other bound controls. It's convenient to have the integration, but I've got different users with different permissions, The long and short is that I'd like to be able to assign the data source during runtime operation, at least to the connection string level.
dbDataSet4 is a typed dataset. I want to learn how to use an Interface. The error message is suggesting using an IList. How would I do this. I'm having trouble finding good documentation on this.
I have to change my sql server and need to point all my crystal reports to that new server at runtime, some reports has StoredProcedures embeded inside and those are the problems.[code]....
I have a form where I have to use control arrays to create a multiple input form i.e. rather than processing one transaction at a time up to 16 transactions must be processed. The following really havent given me much problems at this moment labels and textboxes. I use a for construct to create all the controls including a combobox. This is where my question comes in this form combobox has to be linked to a table in a database. But furthermore and this is where it gets complicated for me anyway each seperate combobox must move independly if i select row 5 in the table in combobox 4 combobox 5 which is havent touched should still be on row 1. How do I accomplish this. I'm using a webservice. I have tried passing a loaded dataset . The code that loaded the dataset is as follows
Dim DSInfo As New Project1.localhost4.AccInfo DSInfo.Credentials = System.Net.CredentialCache.DefaultCredentials InformationData.Merge(DSInfo.GetBusinessJournals)
[Code].....
this code doesnt however provide a link to the table equallly creating a dataset in the combobox method ,loading it and then setting it as datasource also provides no link. I know i'm missing something.
I'd like to adjust Report field height at run time.In the 2nd image, at the 3rd and 4th row of "Wine" column, if the data length is enough for a line, I'd like to adjust its height into a line (And also bottom line object be followed by it). Otherwise, let it be two lines. Please share me which property I'd set.
PS: In page header, I use box object. But in Details section, I just use line object because in report footer, I need to show Total amount. If I use a box in these three sections, there is the box is expanded the whole page without having detail rows at the last page.
I have a list with several fields that is created from dataset from a linqtosql query. At run-time, the user gets to specify what field he/she wants to display from the list. In other languages, I can dynamically do this like:
valueIwant=mylist(i).[fieldnameImInterestedIn]
Where 'fieldnameImInterstedIn is itself a variable. How do I do this in VB.Net?
non-working actual code follows:
Dim patientdata = (From patientvar In pdfdatacontext.tbPatients Where patientvar.PatientID = patientid) Dim patientlist = patientdata.ToList() fieldvalue=patientlist(0).(reportrow.userselectedfieldname)
I'm new to programming and would like to know how can i create radio buttons at runtime using the field values in my sql database. Im creating a survey application.(windows forms)in the relational database i have 2 tables one for questions and one for options.
I have a ProbationComboBox with the SelectedValue bound to a RegistrationBindingSource, and the DisplayMember bound to a ProbationBindingSource. [code]
I'm working with DevExpress GridLookUpEdit Control and I'm a bit stuck with it. Now I know you can't help a lot if you don't have access to it, but I'm trying to figure out why can't I do something like this with it:
GridLookupEdit1.DataBinding.Add("NullText", ds.Tables(0), "SomeField")It gives me an error, says it can't find NullText Property. This confuses me because NullText IS a property and I use it in my code to set the text inside the Editor.
I'm rewriting a VB6 application in VB.Net. So far I have 2 forms, frmLocations (frm1) and frmLocationInfo (frm2). frmLocations has a combobox, cboLocations, from which a selection is made and an "Ok" button is clicked, which then loads frmLocationInfo. frmLocationInfo has a series of textboxes to display info corresponding to the location that was selected - Location, Location Number, Phone, Fax, Email. There are also 3 comboboxes on frmLocationInfo - cboDepot, cboFreight, and cboDispatcher. I need their text property along with items to be populated, also with data corresponding to the initial selection made on frmLocations. I'll spare you all the difficulties I'm having w/the other comboboxes, and instead focus on cboDepot. I have gotten it to populate its text property to display the corresponding Depot, however, the items are not populating and all you see now when you click on the dropdown arrow is only the depot that shows up in the text property.
Here is the code for this portion.
frmLocationInfo Private Sub FillDepotCombo() Dim sql As String = "Select distinct depot.depot_name, depot.depot_refnbr, locations.site from depot inner join locations on depot.depot_refnbr =
I have a text file that looks like this: 9,1,3,Half,2.20 9,2,9,Half,2.20 9,2,7,Full,3.40 9,2,7,Return,4.20 9,5,2,Half,2.20 How I would sum the last column, all of the numbers in bold, of this text file and then make the result as the DataSource of a Textbox?
I was wondering how i can loop through a combo boxes items display item field - and return the value for each - i want this to be generic regardless of the combo boxes data source - or if the combo box has been populated with a string list / class etc
What appears to be a simple logic implementation is embarassing me each time I try to get it done. I have a very simple task: loop over rows in a DataTable and each time the next row is reached, set a variable alternating between 0 and 1.
Dim the alternatingValue as Integer For Each dr As Data.DataRow In DT alternatingValue = 0 Next
...so, when this loop finishes with this row, I need to set the alternatingValue = 1 Then when the next loop finishes, I need to set the alternatingValue = 0?
i want to fill up the userID and password fields of the yahoo mail login page with the click of a button on the form but just cant get it right.[code]it just skips the yahooID field and fills out the password field. what is wrong or is there a better way of doing it?
one of my forms wont load! it is not underlined in blue or whatever but it keeps giving me a runtime error and i dont know why bc it was working before
Code: Private Sub AddEmployeeToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles AddEmployeeToolStripMenuItem.Click NewEmployee.Visible = True 'throwing the error Me.Enabled = False End Sub
thats how i have been opening my other forms too but just this one gives me this error "An error occurred creating the form. See Exception.InnerException for details. The error is: Object reference not set to an instance of an object."
we develop a dll in vb.net and we call that dll in our application .eacgh and every time we register the dll using regasm method.is there is any code for register the dll
