I just wanted to confirm couple of things.
I) Code snippet:
cmb1.Datasource= dt;
cmb1.Valuemember = "value";
Does the control rendering happens 2 time for the control, 1 more time extra because of the value member getting changed after data source assigned. Is this so?
II) How can I trace these re-populations in C#? I just wanted to debug and see and confirm?
I have an Interface defined like this:
Public Interface ISegment
''' <value>
''' The offset where the span begins
'''</value>
[code]....
The problem is that when I try to use the interface in another class, it tells me that Offset and Length are not members of ISegment. Clearly they are. Here is the code that uses the interface
Public Sub UpdateSegmentListOnDocumentChange(Of ISegment)(ByVal list As List(Of ISegment), ByVal e As DocumentEventArgs) Implements IDocument.UpdateSegmentListOnDocumentChange
[code]....
how do I overcome it? I have created a class and compiled into .dll This code
[Code]...
In Visual Studio 2008, if I do this:
[Code]....
Does anyone here know how to get the above to work WITHOUT warnings being generated?
In the following code i get a warning at line 59:Warning 1: Access of shared member, constant member, enum member or nested type through an instance; qualifying expression will not be evaluated.and.. At line 78 I get this Warning:
Warning 2 Property 'SelectedCustomer' doesn't return a value on all code paths. A null reference exception could occur at run time when the result is used.
The program compiles and runs well, but i cant' undesrtand the reason for these warnings. Any Idea ?
1: Public Class Form1
2:
3: 'Form level members
4: Private objCustomers As New ArrayList
[code]....
I have a routine that accepts a List of Objects, a property name and a value to search for and simply returns whether or not it found it.The code I have hangs up at the For loop in the findit routine.[code]
View 4 RepliesI have a form that among other things displays a list of customer names in a combo box. Should the person that launched that form not see the customer in that combo box they can launch another form that will allow them to add the missing customer. The 2nd form adds the customer name to the customer table and the customer information to the customer information table - the 2 tables are related by the CustomerID.I have no problem saving the record to each table but in the process of saving the customer name to the customer table, I would like to refresh the combo box on the 1st form so the newly added customer is displayed in the combo box it was previously not found in.Each time the new customer is added I would like to update the combobox with the new customers name so the user of that form can use it to complete the task it was designed for. I have tried "frm.combobox.refresh", "My. frm. combobox.refresh", changing focus to the first form - none of which worked.
View 6 RepliesI have an Excel file I need to leave undisturbed. I can loop through it and populate a ListView with columns during form load. After that I want to repopulate the ListView, changing column headers and presenting the same data in a different order or with some columns absent. If I created my Excel application As Object when loading the form it is obviously no longer available from a new button as the button is Private. What is the convention for doing this? Does ADO.NET work with Excel? I want to keep the data source invisible (.visible = False) yet manipulate it for the ListView. I could create a text fiile from the Excel and loop through that in each button code. That seems a poor way to do it. There will be no input from the user, just reading from 22 columns displaying only 3 or 4 of them at a time in ListView.
View 3 RepliesCannot appear to be able to get this function to not have the above error.Private Function GetIncidentActions(ByVal FromAgentID As Integer, ByVal ToAgentID As Integer, ByVal incidentAction As Integer, ByVal ActionDate As Date) As String
[Code]...
Warning1property 'Events' shadows an overloadable member declared in the base class 'MarshalByValueComponent'. If you want to overload the base method, this method must be declared 'Overloads'.
<Global.System.Diagnostics.DebuggerNonUserCodeAttribute(), _
Global.System.ComponentModel.Browsable(false), _
Global.System.ComponentModel.DesignerSerializationVisibility(Global.System.ComponentModel.De
[code].....
When I try to compile my VB.NET web project, I get an error that reads:[PropertyName] is not a member of '[Namespace.Class]'The class referenced is part of a dll that the project references. The property definitely exists in the referenced class, and its access modifier is Public. What's more, if I update the reference, or just remove it and add it back, the error goes away: the intellisense shows my property -- all is fine.. that is until I try to compile again. Then the error returns. I've even restarted Visual Studio to no avail. What is going on?[UPDATE]After Will's comment, I've changed the namespace to something I am absolutely sure is unique. Now, I am getting more compiler errors of the same genre. The compiler is not recognizing some of the overloads although they are right there in intellisense. Weird!
Dim gis = New MapQuestGeocoder
Dim r = gis.GetResult(address)
originCoord = r.Coordinate
[code].....
I currently have a page that is populated using a filter, which passes the parameters of the filter via URL.
I'd like to catch those parameters and give the user the opportunity to return to the page with the same filter applied to their view. Essentially, it's a back button. AKA: pass the parameters back into the URL so it repopulates the page.
I am trying to display my data in datagridview. I created a class with different property and used its list as the datasource. it worked fine. but I got confused how to do that in case we have nested class.My Classes are as follows:
class Category
property UIN as integer
property Name as string
[code].....
I'm having a problem at my code. The for each command..Private Sub cmdVoidOrder_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdVoidOrder.Click
[Code]...
I have several pictureboxes in my form with names as "stop0", "stop1", "stop2" ... upto a the number of checked items in my checklistbox. My aim is to use a for-next function so that the program should use for all these pictureboxes a specific image. here is the code I made so far:
Dim a As String = selectedbutton.Replace(" ", "_") & "_"
Dim c As String = ""
For n = 0 To chklstStops.CheckedItems.Count
[Code]......
I am trying to add to a binding using Control.DataBindings.Add(). The issue that I am having is that the data member name has a period and space in it("Foo. Bar"). When I try to add the binding I pass in the string "Foo. Bar" as one of the arguments and I get an exception "CAnnot find datamember "Foo.".Is there a syntax that I need to use to pass the datamember name in when it has a period in it? I tried adding "[]" around the name but no dice.
View 3 RepliesI am trying to read values from textbox controls and combobox controls on a form. Reading the values from textbox controls is working fine but I cannot read from the 3 combo boxes. Here is some simplified code of what I am trying to do.
[Code]....
I would like to be able to set Control visual properties such as color, boarder, flat style, etc. on the base class of the control so that as I add new instances of the control, each instance inherits the visual properties of the base. I have tried using Application Settings but it appears as though I need to reference an application setting manually each time I add the control to a form. This is a Windows Form question.
View 4 RepliesI'm trying to make a program with transparent labels over pictureboxes and when I set the label Parent to the PictureBox the position of the label changes.
View 2 Repliesi frequently have troubles with the dock property. it seems that either the order of creation or adding to the parent control determines whether or not a control's dock property supersedes another's. e.g. a control with the dockstyle fill will overlap with another docked control on the same parent. does anyone know what the rules are to determine how docking will behave; particularly in dynamically created GUIs?
View 2 RepliesIs there a way to bind the text property of a control to an expression? I have a user control that I add to a FlowLayoutPanel. You can see I have 4 controls in the FlowLayoutPanel below. The first control is a LinkLabel and the other three are my user controls which are numbered 1, 2, & 3. I'd like to bind the label that shows the 1, 2, or 3 to the user controls index within the FlowLayoutPanel.
If I happen to remove the 2nd user control I want the 3rd user control to now display 2. I could use the FlowLayoutPanel ControlAdded or ControlRemoved events, but wanted to see if I could do some binding first.
If I need access to the value of a user control's property BEFORE PreRender, would I need to base the custom control off of one of the preexisting data controls (repeater, listview,etc.)?One of my user controls features a gridview control that is configured based on the user control's properties on which it resides. Several of the key properties alter the SQL Statement for the underlying recordsource. I'm now in a situation where the property that sets the WHERE statement for the SQL Statement needs to tied to a value in the user control's parent FormView. Think of the formview as displaying a customer detail record. The user control takes the customer's account number and then displays data from a related table such as Customer Contact Names. Since the gridview is created before the control's prerender event, working within the prerender event doesn't seem efficient.
View 1 RepliesI'm "cloning" objects in my code. For instance: objClone = objOriginal My question is: Does the assignment operator in VB.NET 1.1 do a member-by-member copy of the objOriginal to objClone or does objClone simply point as a reference to memory referenced by objOriginal?
View 3 Repliesi changed a class variable to shared so i can access it in all instances of the class, but it caused an error. what is causing this, and how can i fix it?
Private
Shared img As Bitmap
Me
.img = bgImage
I have 2 tables Table A & Table B Table A has the table values that I want to be populated in a datagridview control.The challenge is that column 1 in table A contains an ID(foreign key) to a name field that is a located in table B. I need the datagrid to have the first column be a combobox that displays the names(from Table B) that are already in table A via the ID's, but reference the populating values from Table B. So that when you bring down the combobox you would be choosing from Table B data but populating table A with the ID and you would see a name there instead of an ID.[code] How do I populate my DS dataset with Table B? And how can I create a link to these two tables using a bound datagridview control?
View 1 RepliesI inherits textbox Control and I added some new properties to it .one of these properties value i want it to change it's value in desgin time when i change Name property of the new textbox
Public Class NewTextBox
Inherits TextBox
Private _txtSubName As String = String.Empty
That is the property for set or get SubstringName of Textbox
Public Property SubName() As String
Get
Return _txtSubName[code].....
that's the property i want to change it's value when i change Name property of the control.i tried to overrides Name property but it's not overridable also i trieds to overloads it but it doesn't work in desgin time.Here is something i tried but it's wronge.
Private _txtName As String = ""
Public Overloads Property Name() As String
Get[code]......
I get this error if I follow these steps: Change property Y of an object (an associated entity property)
Attempt to submit changes At this point the value of Y and the value of X (the underlying key) are not in agreement -- LINQ to SQL apparently doesn't synchronize these until GetChangeSet is called.An expected error occurs due to some business logic or database level constraint during the update operation.At this point the value of Y is in agreement with X because GetChangeSet was called.Change the value of Y to Nothing (aka null).Call GetChangeSet.
The error occurs on the last step because the value of X and the original value of X (returned by GetOriginalEntityState) are different, and the new value does not agree with Y? Is that why? Is this a bug in LINQ to SQL. Must be because I don't see the same behavior if I change Y to another (non-null) value instead during step 5. What's the right way around this? I can see a few ways:
Discard the DataContext when an error occurs and leave the UI as-is. I don't like this because then optimistic cocurrency change conflicts cannot be detected. The new context doesn't have the original values in it that were populated at the same time the UI was populated, so if the UI has any stale values in it, they will cause data in the database to revert.Refresh the datacontext (OverwriteCurrent) and leave the UI as-is. I don't like this for the same reason as #1.Refresh the datacontext (OverwriteCurrent) and re-populate the UI. I don't like this because then the error message just presented to the user does not show the user the error they made and allow them to correct it. It also discards all the other changes the user may have made.When the error occurs, explicitly retrieve the key for Y that corresponds to the original value of X and reset Y, then call GetChangeSet to re-synchronize X (X is read-only or private so I can't reset it directly). This seems to work, but seems like a hack, and may require lots of code for other similar errors.
I know I have done this before and as I remember it should be really easy. But for some strange reason I can't do it now and I am about to jump off the building.I will make it simple:Two tables, one is just a list of products and their code.The other table: "details" has a field named product. I want to store only the code there.In the second table's entry form, I am putting a combobox. This combo box should display the list of products, their names, but depending on which one is selected, the code is what is passed to the table "details". Currently If I set the display member to product and the value member to code it still pases the product to the binded data source.
View 3 RepliesI have a database that holds information about a particular job. One of those things is a customerID. CustomerID links to another table containing customer details. I have a combo box attached to a custom object that holds customerID as the valuemember and CustomerName as the displaymember.The JobDetails holds the customerID info. How do I set the default selection in the combobox based on the ValueMember of the combo box?
View 2 Repliesin VB.NET you implement an interface like this...
Sub SomeInterfaceMember()
Implements ISomeInterface.SomeInterfaceMember
End Sub
while in C# you do it explicitly like this (which can only be called via the interface)...
void ISomeInterface.SomeInterfaceMember(){}
or more simply, implicitly like this...void SomeInterfaceMember(){} // Note the name matches the interface member However, regarding VB, I can also do this...
Sub SomeRandomMemberName()
Implements ISomeInterface.SomeInterfaceMember
End Sub
In other words, the method that handles the implementation can have a completely different name than the interface's member name.I'm just wondering if there's something similar to this in C#. (Yes, I know I can simply do an explicit interface, then access it via another 'wrapper' member with a different name that simply delegates to it, but in VB.NET?