C# - List <Class> New Class Takes Up Memory - Can Set C=null; In The Code

Jul 23, 2010

List New Class takes up memory?Do I need C=null; in the code below?

//class Category
public List<Category> SelectAll()
{
List<Category> LV = new List<Category>();
string command = "SELECT * from categories";
SqlCommand sc = new SqlCommand(command, new SqlConnection(GlobalFunction.Function.GetConnectionString()));
sc.Connection.Open();
SqlDataReader dr = sc.ExecuteReader();
using(dr)
{
[code]...

View 5 Replies


Similar Messages:

Web Forms :: Way To Control Null When Inheriting From Class Library Class

Sep 16, 2010

I have this Control directive in a usercontrol (i've changed the namespace and class name):

<%@ Control Language="C#" AutoEventWireup="true" Inherits="Namespace.Path.To.ClassName" %>
<asp:TextBox runat="server" ID="txtComment" TextMode="MultiLine" ValidationGroup="comment" />
ClassName is a class that lives in a class library and this is the class:
namespace Namespace.Path.To
{
public class ClassName : System.Web.UI.UserControl
{
protected System.Web.UI.WebControls.TextBox txtComment;
protected void Page_Load(object sender, EventArgs e)
{
HttpContext.Current.Response.Write(txtComment == null);
HttpContext.Current.Response.End();
}

View 3 Replies

List All Classes In Application (Including Class In App_Code And Partial Class(aspx Pages And Asmx User Controls)?

Nov 15, 2010

Is there any way to list all the class in my ASP.Net application(Including class in App_Code and Partial Class(aspx pages and asmx user controls)

View 3 Replies

How To Access Label In Parent Class Of Code Behind Class

May 24, 2010

I have a class (name PageBase) that is inhariting System .Web.UI .Page and all my .aspx page behind classes are inhariting this class. This way I have put some common things in PageBase class.

For showing errors I want to put showMessage funtion in PageBase as well so that I may have not put it in every page and it will easy to manage this way.

Probem is that how PageBase class will access a control which is in aspx page in its child class (child class of PageBase) .

I dont want to pass control as argument to function in parent class, is ther any other way ?

View 7 Replies

Using Custom Class With Method That Takes Generic Type Parameter

Apr 23, 2010

I have several custom classes that derive from a common base class so they share several members in common. I would like to be able to pass objecs from any of these three classes to a function that will "look at" common properties. However, it seems there is a catch 22 -- When I try to access a member (.FirstName) of the passed object, the computer reports an error that it thinks the member doesn't exist.

It seems to be a sort of contradiction -- since I didn't declare the type, the computer can't confirm existence, but it seems that it should have to take it on faith since the generic character of the type is specified by the code. Possibly there is something I don't know about that would fix this. I'm showing VB code for what I have so far. I went ahead and hardcoded an instance to confirm that the object exists and has the needed property. I commented out the line that had the code that resulted in the computer reporting an error.

[Code]....

View 2 Replies

C# - Deallocating Memory, Static Class Destructor?

Jan 13, 2011

I have a static class I'm using as my data layer in my website. In this class, I have string arrays that store queried information that I can access later. Here's the part of my class and the method in question:

public static class data_layer
{
ivate static string[] items;
private static string[] description;
//will return description for an item id. if no item id is found, null is returned
public static string getDesc(string key)
[code]....

View 2 Replies

Forms Data Controls :: How To Share Class With Not Enough Memory

Dec 22, 2010

I am getting some memory issues, not entirely sure but does anyone think this could be the issue.On the itemdatabound event the following code runs, and it calls a shared class method Return Image which resizes the original image. Could the coding be the issue for the memory problem. There are about 10 or so items.

If e.Item.ItemType = ListItemType.Item Or e.Item.ItemType = ListItemType.AlternatingItem Then
 
Dim ImgProfile As Image
[code]...

View 1 Replies

"class Has No Ctor That Takes 0 Arguments" Error On Compile

Mar 11, 2010

I have a base class that has a specific parameterized ctor. I use it as the base for several concretes. These concretes have zero need to alter ctor behaviour, and thusly, I see no reason to define one. However, as you may guess, I get the "class has no ctor that takes 0 arguments" error on compile. Is there a keyword I can place on the base class ctor that will prevent the error? Or maybe another way around it? This is indenpendant on any ioc usage by the way. It's merely a set of objects that MUST take an argument, and it so happens, the base class handles everything that it needs. The derivations simply no reason to re-declare the ctor, just to pass it on to base();

View 3 Replies

C# - Inherited Class Giving Null Exceptions?

Mar 1, 2010

Here is my simple class, where i inherit from UserControl.

public class Test:System.Web.UI.UserControl
{
public void BindGrid()

[code]...

View 3 Replies

Web Forms :: Class Object Becomes NULL After PostBack

Feb 13, 2014

I have a asp.net page titled EstMaterials.aspx with a gridview that fills from a SQL table based on a parameter passed to it.  The code for calling the form is below.

<asp:UpdatePanel ID="upAddMaterials" runat="server">
<ContentTemplate>
<div id="AddMaterials" style="text-align:center">
<asp:Button ID="btnDecoy" runat="server" Text="Decoy" style="display:none" />
<asp:LinkButton ID="lbAddMaterials" runat="server" Text="Add Materials"></asp:LinkButton>

[code]....

 I have an a button field set as a link in a gridview.  When the user clicks on the link it should open the "EstMaterials.aspx" page with a gridview listing the materials required for this job.  If I do not have a parameter i.e, ScheduleWeek.oJob.JobSeqNbr, the gridview fills fine.  However, with the parameter listed the gridview does not fill.  It appears the form opens without ever looking at the parameter being passed.The page load event is below.

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
If Not IsPostBack Then
If Not IsNothing(ScheduleWeek.oJob) Then
Dim tbl As New DataTable

[code]....

View 1 Replies

State Management :: Session Used In Thread Class Return Null

May 5, 2010

I want to use session in thread class but it return null in parent that is the page class.

View 4 Replies

Code Reusability / Put The Code In One Class And Want To Inherit Same Code In Each Page?

Apr 12, 2010

Following is the code to insert userName from session and PageName into table to keep record that how many times a user does hit a particular page.

To avoid repitition of code I want to put the code in one class and want to inherit same code in each page.

How to get this task? Please do share with me? Here is the OK code:

[Code]....

View 17 Replies

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

Aug 20, 2010

Since we can access the private data member of base class in the derived class with the help of friend function. How can we do the same in C# asp.net? I mean whats the alternative of friend function in C# asp.net

View 2 Replies

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:

[System.Web.Script.Services.ScriptService]
public class Controller : System.Web.Services.WebService {
[WebMethod]
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="http://tempuri.org/">
<client>
<address>string</address>
<website>string</website>
</client>
</save_client>
When I'm expecting the following:
<save_client xmlns="http://tempuri.org/">
<client>
<id>string</id>
<name>string</name>
<address>string</address>
<website>string</website>
</client>
</save_client>

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?

View 1 Replies

Partial Declarations Of '[Class.Class]' Have Conflicting Accessibility Modifiers?

Aug 10, 2010

I first need to apologize in case this has been answered before but I'm a newbie (green as they come) and this error keeps popping up even before I start debugging! There are two errors and the second one is:" Error 2

Missing partial modifier on declaration of type 'WFPKenya2.WFPKenya2'; another partial declaration of this type exists"

View 6 Replies

How To Define Properties And Methods Of Class That Inherit Stream Class

May 15, 2010

here is the code, where i am confused what to write in all the properties and functions of the base class stream?

I want to inherit abstract class Stream, but confused about what to write?

[Code]....

I could'nt understand how to define these Properties,Sub and Functions. How i start?

View 20 Replies

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.

View 3 Replies

Visual Studio :: Class Diagram And Show Reference Id Of Other Class?

Jul 12, 2010

am using class diagram of visual studio 2008as you can see the image i need show to user that the period and calendar classes have the idMarket property that refers to market classhow can i do this?

View 1 Replies

Web Forms :: Why Class Of User Control Is Unavailable In Another Class File

Nov 18, 2010

I have build a UserControl with separate code behind file.In that code behind file i have defined some public properties in the Partial class of user control that was automatically generated.Those properties will initialize some properties of controls that are used in the control.Now, in .aspx page i used this User Control and initialized the public properties through code behind of aspx page for dynamic contents.

View 6 Replies

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:

[Code]....

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:

[Code]....

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.

View 5 Replies

State Management :: Try To Send Something Or Refresh Page, Class Is Reseted And It's Value Is Null

Dec 15, 2010

Everytime I try to send something (or refresh page for that matter), gameclass is reseted and it's value is null. I need this to be presitant for at least one user.I know controller is not the best place for that logic, but for now I'm only
making basic iterations on how things work.

[Code]....

View 3 Replies

Getting Child Class Type From Parent Class Parameter In C#

Jul 6, 2010

I am going to have multiple "types" of an object and I am really not sure how best to retrieve/save those multiple types without having a separate save/retrieve for each type.

My classes:

[Code]....

I hope this makes sense. I'd rather not add a "type" column as I have this in another part of my database and I am not really liking it too much

UPDATE

Here's more info/questions for clarification, if necessary.

I'm really at a loss for how to incorporate them into my repository pattern.

When I call getEvaluation, I want it to return an abstract Evaluation, but I'm struggling with this code. Same with Saving - any insight on this would be excellent

UPDATE 2

Database:
Evaluations
Id (PK)
Comment
EvaluationType1
Id (FK to Evaluations.Id)
Field
EvaluationType1
Id (FK to Evaluations.Id)
Field

So, in getEvaluation(int id), I need to figure out what type of Evaluation they want. Does this mean I should pass in a type? Same is true in saveEvaluation, But I can do a switch/function map to see what Type it is.

View 6 Replies

Web Services - Can A Webservice Class Inherit Page Class?

Jan 6, 2011

i have an application consisting of two asp.net projects. And i have have a BasePage which inherits System.Web.UI.Page and have the class some core logic which i require in all of my pages(Implemented in BasePage.cs). So all my pages inherit this BasePage.cs . Now can an Webservice inherit the same class apart from the normal webservice class System.Web.Services.WebService

View 4 Replies

C# - Store Class Instance (helper Class) In Cache?

Jun 30, 2010

I have a class instance which is created by using Activator.CreateInstance() method. That class instance contains helper methods which are frequently used throughout the application. In order to avoid creating the instance multiple times, I'm just thinking about implementing an appropriate caching mechanism. The following consideration should be taken into account:

1) I can't use static class and methods.
2) There are around 6 instances (1 instance per class) per App Domain.

View 4 Replies

Web Forms :: Use System.Drawing.Bitmap Class Into Other Class?

Oct 5, 2010

How can I to use System.Drawing.Bitmap class into athoer class?

using System.Data;
using System.Collections;
using System.Globalization;
using System.Data.SqlClient;
using System.Collections.Generic;
using System.Globalization;
using System.Text;
namespace University
{
public class Class1
{
System.Drawing.Bitmap BMP=new System.Drawing .Bitmap();
}
}

when I use System.Drawing.Bitmap gives error this class does not exists

View 2 Replies







Copyrights 2005-15 www.BigResource.com, All rights reserved