Sometimes in my web applications I used to get this sort of error, I have no clue why is it coming however if I refresh the page few times the page is loading normally.I am using .net framework 2.0 and visual web developer 2005.
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I have a window service that Inherits System.ServiceProcess.ServiceBase. While running in debug mode (havent tested compiled), the thread does not see the current user credentials. I need the credentials so I can set up the WebProxy and I would prefer to use the account that service is running under instead of passing the user and pwd as a string.Can someone help me figure out why the code running in the class the inherits from ServiceBase does not have have the credentials of the logged in user?
View 1 RepliesI've been creating short test apps repeatedly to try to understand some of the concepts in VB.NET.For the most part it has been illuminating.I read Bucky's .NET knowlegebase tutorial on passing objects as parameters to newly created forms. He shows how to create a new class that inherits from the base form class and define a New() method with parameters Extending the concept I thought about doing the same thing with a form that was created at design-time (In this case Form2).
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If Class X is within the scope of Class Y, is X a subclass of Y?If Class A is a sub Class of B, then is Class B considered a super class of A?if Class C inherits Class D is Class D a superclass or parent of Class C?if Class E extends Class F then we can consider Class E a child of F?if Class G inherits Class H and is within the scope of Class I then who is the parent of Class G? Classes that inherits Class J and classes that are within Class J are all sub classes of Class J?
View 1 RepliesI am trying to create a class in VB.NET which inherits a base abstract class and also implements an interface. The interface declares a string property called Description. The base class contains a string property called Description. The main class inherits the base class and implements the interface. The existence of the Description property in the base class fulfills the interface requirements. This works fine in C# but causes issues in VB.NET.
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If I have a class that inherits another class in which there are objects that are disposed in the dispose() procedure, do I use mybase.dispose? ex Class A inherits Class B. [code]
View 2 RepliesI'd like to know if my textBox1 variable has the ABCAttribute. How can I check this?
View 3 RepliesI think I remember reading somewhere that it was possible to assign items to a variable if the item inherited from a base class, but I can't remember how.
I want to have a class that gets properties set and one of the properties is an error code property. I want to assign any exceptions that occur to the property, but it could be any type of exception. I remember that all exceptions inherit from the Exception class.
How can I assign an exception to a property based on the class it inherits from?
I'm extending the ComboBox class in VB.NET and I'm running into a problem prepopulating the collection. I try to do so by using Me.Items.Add() calls in the New() sub. However, once I place the control on a form in the form designer, Visual Studio automatically adds those items to the collection in form designer, then they are added again at runtime. How can I make them only added once?
View 1 RepliesI have a class that inherits from the picturebox class, is represents a gauge. In that class I have an overriden function : [code]and I have on my screen what I expected. But in my form I have a timer that generates a new value for the gauge.[code]For some reason the refresh doesn't work. The gauge doesn't change, the overriden onpaint doesn't get triggerd again. anybody has any idea why?
View 12 RepliesI have a base class called PageBase and then a derived class TestPage that inherits from PageBase. In PageBase I have overridden the OnInit() and when it is called and I inspect the value of 'Me', it is of the type of the derived class and not the base class. My question is how does inheritance really work? For instance, when instantiating TestPage does an instance of PageBase get created too?
Here is my code;
Partial Public Class TestPage
Inherits PageBase
Public Sub New()
[code]...
I have created 3 classes which inherits from(System.Collections.Specialized.NameObjectCollectionBase)
The first class "SQLCommandsCollection" stores "SQLCommands" in a collection.
The second class "SQLTableNamesCollection" stores "SQLCommandsCollection" objects in its collection.The Third class "SQLDBNamesCollection" stores "SQLTableNamesCollection" objects in its collection.
Ultimately I will sit with a "SQLDBNamesCollection" collection which contains all Table names and its respective SQLCommand objects.
I would like to store this "SQLDBNamesCollection" object in my.settings("QueryViewerQueriesPerTableNamePerDBName")
at runtime but I am unsure what this settings type should be.
I have tried system.oject but this does not seem to work as I get an "Unable to cast object of type 'System.String' to type 'Fusion.SQLTableNamesCollection'" exception when I try to retrieve from settings. See below code.
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When I write the following statement in VB.Net (C# is my normal language), I get an "end of statement expected" referring to the "Implements" statement.
<Serializable()> _
<XmlSchemaProvider("EtgSchema")> _
Public Class SerializeableEntity(Of T As {Class, ISerializable, New}) _
Implements IXmlSerializable, ISerializable
...
End Class
The C# version that I'm trying to emulate is:
[Serializable]
[XmlSchemaProvider("MySchema")]
public class SerializableEntity<T> : IXmlSerializable, ISerializable where T : class, new()
{
....
}
I have quickly made up a class that inherits listboxes and uses
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I have a Class CButtonCreate without get & set Methode. But i wanna use the Attribute "string newFileName" from the Class CButtonCreate in a other Class thats Class WriteToFile. How can use the Attribute newFileName in the Class WriteToFile?
class CButtonCreate
{
// Create a Folder && SubFolder from the tbProject
public void CreateFolder(string MyFolderName, string Mytbs, string MytbRevision, string MyTestSystem)
{
[code]....
After I published my application and then installed it to the same computer i used to develop the application, there was an error during the installation, the data source file was not found in the new location set by VBE 2010. How to make sure data source file will be installed at the pre-defined location? so that there will be no installation error.
View 9 RepliesI'm trying to force an inherited class to use a custom attribute. I'm creating a class library where the user who wants to create an item will do so, but be forced to add an attribute (or visual studio will automatically add the default attribute) to their inherited class. Here is what I'm hoping to achieve:
BaseClass.vb:
<CustomAttribute(10)> _
Public Class BaseClass
End Class
MyClass.vb:
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I'm creating a custom control which inherets the BindingNavigator.I need do add one ToolStripButton at specific posistion (9 element) on the ToolStrip of the BindingNavigator.So, I wrote the following code:
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I'm just wondering, how do i make a class link into my main code, it is in the same project so no need to reference it
Ive set up the the class and typed
code:
But they aren't linking/ working.
I am trying to set the class attribute of a list item on page load. Dim liItem As HtmlGenericControl = DirectCast(Page.FindControl("default"),HtmlGenericControl)liItem.Attributes.Add("class", "active")
This code doesn't work, not quite sure why.This is the error it is generating "NullReferenceException: Object reference not set to an instance of an object"
Is there a way I can assign a value to a class attribute using a constant? would like to do this so that I don't have tocode a constant value in the attribute and then again inside the class.
<TemplatePart(Name:=TESTVALUE, Type:=(GetType(ContentControl))>_
Public Class MyContentControl
Inherits ContentControl
[code].....
ToSerializable is it possible instead of marking a Class with the <Serializable()> attribute?
as in the following Class.So you could maybe do:>>myObject.ToSerializable
<Serializable()> _Public Class ExampleClass
End Class
I have the following architecture for my project:UI -> Web Server -> App Server -> Database
I am using SOA architecture for my project. My Web Service is residing on AppServer having BL (Business Layer) / BO (Business Object) / DAL (Data Access Layer). I am exposing the BL using Web Service. I am getting the service reference to this Web Service at WebServer by creating the proxy using WSDL.exe. Now my question is:
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I know that in a WebBrowser you can use Document.GetElementById to find an element by its name attribute, but I want to search the webpage for an element using the id or class atributes, how would it be possible to do this in a WebBrowser? I want to make it click on an image tag.
<td id="button1-cell"><img src="/static/button1.png" alt="Button 1" id="but1"></td>
Also, is it possible to InvokeMember("click") on divs?
i am comfortable with class, namespace ,Sub ,Function ,Properties ...and so on. i studied about Custom Controls and Extension methods. There i found something new so called Attribute that are placed before classes and Functions definitions.[code...]
View 4 RepliesI'm trying to make a code editor using the class SyntaxRTB which colors the keywords only,I tried to modify it so that it colors comments as well by adding the following block of code to the sub ColorLineNumber() but the problem is you can't write comments on the same line that has code on it and I don't know how to do it?
Dim Instance As Integer
Dim CLine As String = Me.Lines(LineIndex).ToLower
Instance = InStr(CLine, "'")
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I'm trying to determine if a interface is decorated with a specific attribute. For example, I have the following interface:
<MyCustomAttribute()> _
Public Interface IMyInterface
Function Function1
[code]....
How do I determine if IMyInterface is decorated with the MyCustomAttribute attribute?
can we make code which can make copying a file in a particular drive invalid/access denied?
View 3 RepliesIDE is showing error in following code
<Extension()> _
Public Function FindByCode(Of TEntity)(ByRef vTEntities As EntitySet(Of TEntity), ByVal vCode As String) As TEntity
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I wonder, what is the most elegant way of dealing with the dbnull situation. I have a class, with attribute, let's say: "End_Date", which is being read from database. Type of this variant should be date, but as it's the "End_Date", there might be the situation that something haven't ended yet, and in the database in this field I have a null value.
Right now a deal with the problem this way:
Dim mEnd_Date
...
Public Property End_Date ()
Get
End_Date = mEnd_Date
End Get
Set(ByVal value)
mEnd_Date = value
End Set
End Property
But I am not sure if that's a good way as I don't declare variants as any datatype?
