How To Make User Control Partial Classes Aware Of Controls Declared In The Base Class

Mar 5, 2010

Do we have to do something special to have ASP.NET partial classes aware of controls that are declared in our user control's base classes? The partial classes keep generating declarations for controls in the base class which mean the controls in the base class get hidden and are null.

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ADO.NET :: Partial Declarations Of 'Shirt' Must Not Specify Different Base Classes?

Dec 15, 2010

I am trying to setup a base product class that will be inherited by a more specific class later. Here is my scenario. I have a table called ProductBase, it contains three fields, BaseProductId(PK), CatalogNum, and ListPrice. Every product in the system will share these attributes. Next, I have a table called Shirt, with three fields BaseProductId(PK, FK), Color, and Size.

I then setup an Entity Data Model that pulled in both of these tables, and created to classes BaseProduct and Shirt.

So, in my model, I want to do something like this:


The problem I have with this approach, is that I cannot force the properties for the Shirt. What if I make a change to the BaseProduct? What happens when I have multiple product types, will I have to repeat this code?

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I am following the Nerd Dinner tutorial as I'm learning ASP.NET MVC, and I am currently on Step 3: Building the Model. One part of this section discusses how to integrate validation and business rule logic with the model classes. All this makes perfect sense. However, in the case of this source code, the author only validates one class: Dinner.

What I am wondering is, say I have multiple classes that need validation (Dinner, Guest, etc). It doesn't seem smart to me to repeatedly write these two methods in the partial class:


This doesn't "feel" right, but I wanted to check with SO to get opinions of individuals smarter than me on this. I also tested it out, and it seems that the partial keyword on the OnValidate method is causing problems (understandably so). This doesn't seem possible to fix (but I could very well be wrong).

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TextReader Fetches Data - Base Class Of All Other Reader Type Classes?

May 10, 2010

I am Confused about the TextReader Class,that how it fetched data ?And from where it fetches data?

Is this the base class of all other Reader type classes?

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How Does The Child User Control Inherit The Markup From The Base Class

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I have a user control (uc1) which inherits from uc2. uc2 has a user control (uc3) declared in the markup. I am trying to access uc3 from uc1 but I get NullReferenceException. I thought due to inheritance uc3 would instantiate but looks like I am missing a step.


How does the child user control inherit the markup from the base class? The server controls in the base user control are null in the code behind of the base user control. Why?

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Server Controls In User Control Are Null When User Control Serves As A Base User Control ?

Jun 4, 2010

I don't think I understand fully how ASP.NET does inheritance of controls.I have a user control, ucBase, which has an label in the ascx file. Code behind references the label and it works fine during run time if the control is not a parent for another user parent.

If I have another user control, ucChild, inheriting from ucBase, the label in ucBase's code is always null. ucChild has no controls in its ascx fileThe server controls (like the label) needs to be declared in the ascx file and not created programmatically.What needs to be done for ucBase to see its own controls when it's a parent user control?

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I have a user control in silverlight which contains both XMAL and .cs file. But I wanna make it into a base control. In other word,I can make a control inherited it whose area in it can be edited. Just like Master Page in,you know. In the base control,I only have a lot of description in XMAL,perhaps it can be described in the .cs file,too.

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Call Always Base Class Method Like Base.OnInit()?

Jun 29, 2010

I am new in asp .net.I am not able to undestand why we call base class method when we
override methods/events.Like automatically visual studio will put base.OnInit() if you are overriding OnInit.

protected override void OnInit(EventArgs e)

same is the case of Finalize. In derived we call base.Finalize() Is there any need of calling these base class methods ?

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UserControl Inheritance - Web Controls In Base User Control Are Null Pointer

Mar 1, 2010

i have a base user control (WC1) which inherits from WebUserControl and a child user control (WC2) which inherits from WC1. I added a textBox and a label to WC1 in vs design view not code behind. But all the server controls that i put in WC1 are null and give null pointer exception.I tried to access textBox and label in different events but the all of them are null.

Steps to reproduce the error:

create a web user control called WC1 by add a new item in VS added a textBox and label server control to WC1 in design view of VS and put code behind: var value = txetBox.Text; created another web user control called WC2 by add a new item in VS and change its base class to WC1 in its code behind create a web page by adding a new item in vs and drag WC2 to the design view of the page run the page then you will see the exception for the codebehind in WC1



<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="WC2.ascx.cs" Inherits="WebApplication1.WC2" %>

can web server controls of WC1 be instantiated in this case? or can user control inherit from another user control and web server controls of parent user control be carried to its children without worring the layout?

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Web Forms :: Reference Control On Third Level Master Page From Content Base Class?

Aug 8, 2010

I am attempting to access a textbox control on a master page from a code behind base class but having problems. I have 3 levels of master pages. m1.master is the master page for m2.master which is the master page for m3.master.m3.master has a textbox as shown below


I have a content page c1.aspx that uses m3.master as its master page as shown below:


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Architecture :: Two Different Base Classes Sharing Some Of The Same Code?

Mar 21, 2011

I got loads of website, that share one of two baseclasses. I need the two baseclasses to be able to share part of the same code. I dont want to have to duplicate the shared code per baseclass.

so.. I got a page.aspx that inherits the baseclass and that inhertis 'sub' baseclass that inherits the class. So far so good :-)

In my baseclass I got a Public (at the top of the class not in any method- not sure of the proper term) Varable that is constructed from a structure in the BO class.

it Public PageDetails AS CoreDomainSetupBO.GetStartUpDetails = {database method}

I need the pagedetails to be available in the sub baseclass but it cant be defined there as the page details value is defined differently in the different base classes.

I hope that makes sense, I need to sub base class to be able to use a property that is defined at baseclass level.

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Web Forms :: VB.NET - Import Statements And Base Classes?

Aug 19, 2010

I have a BasePage class that all of my content pages inherit from. In my BasePage, I have many Import Statements. It seems as though they carry over into the derived class as one would expect. However, if you were to try and access code in the client aspx design page, as you would in the code-behind, you run into problems.

For instance, in my BasePage i have a Public Enum named ThemedSites. It's just an enumerator that lists the 5 different themes my site could be skinned as. I, at times, need to do different things in code, and in design, depending on what theme I'm currently in. I have a Public Property named CurrentSite (might have been more appropriate to say CurrentTheme, but that's besides the point). CurrentSite's return type is ThemedSites. So in code, one would say something like:


This works great in any page that inherits the BasePage class. This falters when that very same logic is used in the design page like:


Now, it works if you fully qualify both sides of the condition, but that's not my question. My question is: why isn't the Imported NameSpace in the BasePage recognized in the client-side server tag, as one would think it would be, according to how it IS recognized in the server-side code-behind?

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How To Develop Data Aware Web Control

Mar 4, 2011

How to develop a custom data aware web control?

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C# - How To Implement User Base Security Not Role Base

Apr 26, 2010

I have to implement User base security in my Web project using .Net3.5. Followings are some we need:

Roles can be Admin, Manage, Editor, Member etc User can have multiple roles Every roles has its own dynamic menus and restrictions/resources All menus and interface will populate dynamically from Database

I heard some where this kind of i.e user base security can be implemented using HashTable but I dont know how is it?

Today I came to know that for this kind of work Java people use Interceptor Design patterns. So, how could I do the same in C#?

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C# - How To Access A Private Data Members Of Base Class In The Derived Class

Aug 20, 2010

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C# - Webservice Complex Types And Class Inheritance - Use The Properties Of The Base Class?

Mar 13, 2010

Using the following Webservice definition using aClientArgs as a complex type:

public class Controller : System.Web.Services.WebService {
public void save_client(aClientArgs client)
// Save client data
Then defining aClientArgs as a sub-class:
public class aArgs
public string id = null;
public string name = null;
public class aClientArgs : aArgs
public string address = null;
public string website = null;
Returns the following WSDL fragment for the save_client args:
<save_client xmlns="">
When I'm expecting the following:
<save_client xmlns="">

So it appears that the .NET WebService is not treating inherited properties as arguments/variables for purposes of a web service. How do I get .NET to also use the properties of the base class?

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Mvc - Can Set A Custom Class As The Default Base Class For Controllers In MVC3

Feb 15, 2011

I'd like to inherit all my controllers from a custom base class that I write myself. I can change the line every time I add a new controller, but it would be nicer if I could somewhere specify the default value that gets set there. That way I wouldn't need to worry about forgetting this, and other people who get added to the project later on would have an easier time.

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MVC :: Trying To Setup A Base Product Class That Will Be Inherited By A More Specific Class Later?

Dec 16, 2010

In my MVC project, I am trying to setup a base product class that will be inherited by a more specific class later. Here is my scenario. I have a table called ProductBase, it contains three fields, BaseProductId(PK), CatalogNum, and ListPrice. Every product in the system will share these attributes. Next, I have a table called Shirt, with three fields BaseProductId(PK, FK), Color, and Size.

I then setup an Entity Data Model that pulled in both of these tables and created classes BaseProduct and Shirt. So, in my model, I want to do something like this:


The main problem I have with this, is that if I do any kind of condition on CatalogNum or ListPrice, then my performance goes to crap. One of the main things we will want to do is something like this:


This takes an enormous performance hit, and I suspect it is because the partial class above returns to the database for each shirt.

The other problem I have with this approach, is that I cannot force the properties for the Shirt. What if I make a change to the BaseProduct? What happens when I have multiple product types, will I have to repeat this code? I assume I will need to make a change with the entity data model, but I am unsure where to begin.

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C# - Mapping NHibernate Many-to-one Relationships From Abstract Base Classes To Union-subclasses?

Nov 19, 2010

I am having a problem mapping a many-to-one relationship from an abstract base class mapping to a concrete union-subclass. Example:

public abstract class Entity
public virtual Guid ID {get; set;}
public virtual string Name {get;set;}
public virtual User OwnerUser {get; set;}

public class User : Entity
public virtual string UserName {get; set;}

I have a base abstract class for all of my database objects. I am mapping these classes with the Entity class as the abstract mapping class and the User as a union-subclass. When creating the configuration object, no errors are thrown and the Schema exports just fine. However, the field to the OwnerUser just won't show up in the database for all of the concrete classes. Here is an example of how the mapping looks

<class entity-name="Entity" name="Entity" abstract="true">
<id name="ID" type="guid">
<generator class="guid.comb"/>
<property name="Name" />
<many-to-one name="OwnerUser" column="ID" entity-name="User" />........

I am also using an Oracle XE instance as the database backend. If this isn't enough information to properly answer the question, let me know and I will add what I can.

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DataSource Controls :: EntityFramework Base Class Inheritance?

Feb 11, 2010

I am having some issues with my base class inheritance. I am currently employing Table per Type Inheritance for the following tables:


Members Table

- Member ID (PK)

- First Name

- Last Name

- Email

- ...

Students Table

- Member ID (FK)

- Credits

- Notes

- ...

Instructors Table

- Member ID (FK)

- Biography

- Office Hours

- ...

My Entity Data Model defines "Member" as the base class for both Students and Instructors, since members can be both students as well as instructors simultaneously. The problem, however, occurs when I attempt to get a list of Members objects. Because the database contains members who are indeed students AND instructors, the following exception is thrown:

All objects in the EntitySet 'CountyCollegeEntities.BaseMembers' must have unique primary keys. However, an instance of type 'CountyCollege.NET.Administrator' and an instance of type 'CountyCollege.NET.Student' both have the same primary key value, 'EntitySet=BaseMembers;ID=10016'.

I am beginning to think that I made a mistake by building these classes to inherit from Member although it has been ideal up until this point. But before I start ripping up all my existing code to remove this inheritance, I thought I would see if anyone has any tricks that would make this work. Any advice as to either how I can get around this error or a more appropriate way to structure my classes would be very much appreciated.

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Set Focus To User Control And Blur Base Page?

Feb 11, 2010

I have a progress bar (which is a user control). When user, click a button, this progressbar will get displayed. The issue is ...even if the progressbar is visible, I am able to set focus to other controls in base page. I need to blur the base page...and set focus to user control.

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.net - Subscribing To An Event Defined In The Base User Control?

Apr 4, 2011

I have a base user control (inherited from System.Web.UI.UserControl)

public delegate void MyEventHandler(object sender, MyEventArgs e);
public event MyEventHandler ControlLoaded;
//Fire the event from here
protected override void OnLoad(EventArgs e)
MyEventArgs cmdEventArgs = new MyEventArgs("somearg");
ControlLoaded(this, cmdEventArgs);

I have several controls that are derived from this base user control.

On the host ASPX page, I need to subscribe to the ControlLoaded event.

protected void Page_Load(object sender, EventArgs e)
//subscribe to the event
//This line DOES NOT WORK as I cannot attach event to a base control - It needs an instance of the user control which I don't have
BaseUserControl.ControlLoaded += new MyEventHandler(ControlLoaded);
private void ControlLoaded(object sender, MyEventArgs e)
// some control has been loaded

How do I subscribe to the ControlLoaded event?

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