.NET Tutorials, Forums, Interview Questions And Answers
Welcome :Guest
Sign In
Win Surprise Gifts!!!

Top 5 Contributors of the Month
Gaurav Pal
Post New Web Links

run time controls

Posted By:      Posted Date: October 24, 2010    Points: 0   Category :ASP.Net

Hi all. I've this code:

<%@ Page Language="C#" Debug="true" %>

<script language="C#" runat="server">

void CreaLabel(Object sr, EventArgs ea){
Label lbl1 = new Label();
lbl1.Text="New label";
lbl1.Style["left"] = "20px";
lbl1.Style["top"] = "90px";
lbl1.Style["position"] = "absolute";

void SubClick(Object sender, EventArgs e){
Button b= new Button();
b.Text = "Button-2";
b.Visible = true;
b.Style["left"] = "10px";
b.Style["top"] = "60px";
b.Style["position"] = "absolute";
b.Click += new System.EventHandler(CreaLabel);



<form id="form1" runat="server">
<asp:Button id="b1" Text="Button-1" OnClick = "SubClick" runat="server" />


When i click on Button-1 then Button-2 appears. Ok. When i click on Button-2... the same Button-2 disappears and the label doesn't come... Why?

Thx you

View Complete Post

More Related Resource Links

How to programmatically add controls to Windows forms at run time by using Visual C#

Create a Windows Forms Application
Start Visual Studio .NET or Visual Studio 2005 or a later version, and create a new Visual C# Windows Application project named WinControls. Form1 is added to the project by default.
Double-click Form1 to create and view the Form1_Load event procedure.
Add private instance variables to the Form1 class to work with common Windows controls. The Form1 class starts as follows:

UI on the Fly: Use the .NET Framework to Generate and Execute Custom Controls at Run Time


Creating UI controls on the fly can be accomplished via run-time code generation. And there are lots of reasons to do so. Generating these controls once and then reusing them as needed is more efficient than generating the controls each time. Read on.

Morgan Skinner

MSDN Magazine December 2005

Visual Studio .NET: Building Windows Forms Controls and Components with Rich Design-Time Features, P


This is the second of two articles discussing the extremely rich design-time features of the .NET Framework. Part 1 discussed the basics, showing you where to start and how to extend your control implementation through attributes and interfaces, as well as their effects on the property browser, code serialization, and other controls. Part 2 continues the journey by concentrating on design-time functionality that you can implement beyond your components and controls, including TypeConverters, UITypeEditors, and Designers. It would be impossible to cover everything you can do in two short articles, which is a testament to just how all-encompassing and flexible the design-time capability of the .NET Framework is.

Michael Weinhardt and Chris Sells

MSDN Magazine May 2003

Visual Studio .NET: Building Windows Forms Controls and Components with Rich Design-Time Features


Visual Studio .NET provides support for designing rich features into your controls and components, allowing you to set properties, set form placement, inherit from base classes, and much more. So how does Visual Studio .NET do all this? What does the Windows Forms designer do? What's the difference between a control and a component? How does Visual Studio integrate your controls so that they can access features of the .NET Framework?In this article, the authors answer these common questions by building a clock control and taking the reader along for the ride. In building the control, hosts and containers are illustrated, the property browser is explained, debugging is discussed, and a general overview of the design-time infrastructure is presented.

Michael Weinhardt and Chris Sells

MSDN Magazine April 2003

Custom panel - missing design time support for controls.

I’m trying to implement a custom panel, one that will behave kind of like the standard Canvas panel. The implementation is done and it is working when I add components in the xaml, but what is not working is move and resize of components in the designer. In the designer each component shows the ‘selected frame’ when selected, but it cannot be moved or resized. Can someone point me to what I’m missing, or an article that describes how do add this support?.   The reason I’m not deriving from the existing Canvas is mainly because I want to understand how it works and how to implement it manually.   Thanks  

How to create templete controls inside a gridview at run time


i am creating a grid view at run time.now i want to create controls inside the gridview at run time itself,and how to Bind/Eval it.

plz help me

Binding WPF Controls to an Entity Data Model

In this interview, programming writer, McLean Schofield, demonstrates how to bind WPF controls to an entity data model, using Visual Studio 2010 Beta 1. You can also learn more in the topic: Walkthrough: Binding WPF Controls to an Entity Data Model.

Round off time to the nearest minute

How would you round this up to the nearest minute? There isn't a built in function to do this so you have to use a little bit of maths to get there. There are 60 seconds in a minute. We already have 38 seconds on the clock. So we need to add on 60 - 38 = 22 more seconds.

Custom Controls in C# .NET

Embedding user controls in a Windows form is just like adding a simple button or text box that are already provided with .NET. These basic controls were written essentially like you code your own controls. Typically the controls you design are to be used in multiple forms or to modularize your code. These reasons help reduce the amount of code you have to type as well as make it easier for you to change your implementation. There should almost never be any reason to duplicate code because it leaves a lot of room for bugs. So, implementing functionality specific to your control in the control's source code is a good idea. This reduces code duplication as well as modularize your code, which is a good programming guideline.

Accessing the different controls inside a GridView control

how we can access a particular control which resides inside a GridView control. In this article I will show you how you can access different controls inside a GridView control. We will see how we can access a TextBox control, a DropDownList control and a ListBox control. If you are working with ASP.NET 1.X then you might want to check out my article Accessing Different Controls Inside a DataGrid.

Using ASP.NET 3.5's ListView and DataPager Controls: Displaying Data with the ListView

Prior to ASP.NET 3.5, developers who needed to display a set of records could choose between the GridView, DataList, and Repeater controls. The GridView provides rich data features, but has a very boxy layout; the DataList and Repeater allow for a more flexible layout, but lack the "point and click" data features found in the GridView, DetailsView, and FormView controls. The ListView bridges the gap between layout flexibility and built-in data features.

This article, the first in a series of articles on the ListView and DataPager controls, looks at the ListView's many available templates and illustrates how to display data. Read on to learn more!

Binding WPF Controls to an Entity Data Model

In this interview, programming writer, McLean Schofield, demonstrates how to bind WPF controls to an entity data model, using Visual Studio 2010 Beta 1. You can also learn more in the topic: Walkthrough: Binding WPF Controls to an Entity Data Model.

Working with DropDownList and ListBox Controls in ASP.NET

"In my application i am using dropdownlist to display all categories from a table. When the user clicks this control I display all records in that category. Category table also contains column called color.

I wanted display some categories in dropdown list different color and others in different color using ASP.NET."-Anonymous

Performance Tests: Precise Run Time Measurements with System.Diagnostics.Stopwatch

Everybody who does performance optimization stumbles sooner or later over the Stopwatch class in the System.Diagnostics namespace. And everybody has noticed that the measurements of the same function on the same computer can differ 25% -30% in run time. This article shows how single threaded test programs must be designed to get an accuracy of 0.1% - 0.2% out of the Stopwatch class. With this accuracy, algorithms can be tested and compared.

Date and Time Functions in SQLSERVER

Date and time functions allow you to manipulate columns and variables with DATETIME and SMALLDATETIME data types.

1 DATEPART Function
2 DATENAME Function
3 DAY, MONTH, and YEAR Functions
5 DATEADD Functions
6 DATEDIFF Function
7 More SQL Server Functions

Data Types - Date and Time in SqlServer

Date and time values can be stored with either the DATETIME or SMALLDATETIME data type. The difference between the two is that SMALLDATETIME supports a smaller range of dates and does not give the same level of precision when accounting for time. The DATETIME data type can hold values from January 1st of 1753 to December 31st of 9999. The time is stored to the 1 three hundredths of a second and each value takes up 8 bytes of storage. The SMALLDATETIME data type can hold values between January 1st 1900 and June 6th of 2079. The time is tracked to the minute and each value takes up 4 bytes of storage. The majority of business applications can live happily with SMALLDATETIME, however, if you are in an environment where each second matters or you need to make estimates to the distant future (or past) then you have to resort to DATETIME. If you fail to specify the time when inserting a value into a DATETIME or SMALLDATETIME column, a default of midnight is used. If you fail to specify the date portion the default of January 1, 1900 is used.

Dynamically Create Controls in ASP.NET by Using Visual C# .NET

This article demonstrates how to dynamically create a control for an .aspx page. The sample project does the following:
Creates two TextBox controls.
Verifies that the contents (TextBox.text) and the attributes of the TextBox are saved across posts to the server.
Illustrates handling events that are posted by a dynamically-created control
ASP.NetWindows Application  .NET Framework  C#  VB.Net  ADO.Net  
Sql Server  SharePoint  Silverlight  Others  All   

Hall of Fame    Twitter   Terms of Service    Privacy Policy    Contact Us    Archives   Tell A Friend