Loading in vb net

Visual Basic projects have a special object that can be automatically loaded when the program is run. This object is referred to as the Startup object. Figure 4. The Startup object can now vary depending on the type of project you are creating. You would specify Nothing when the program does not require an interface. An example of this type of project might be an ActiveX component or an ActiveX control.

When a form is specified as the Startup object, that form automatically loads into memory when the application starts. No other form loads unless it is referenced in program code or is explicitly loaded into memory. Use the Load statement to load a form into memory without making it visible yet. The Load statement will take only one argument: the name of the object to be loaded.

Take a look at the following code:. The Load statement in both cases accepts a valid object name. This causes the object to load into memory. Although the object loads into memory, this does not mean that the object will be visible to the user.

This enables the programmer to load multiple forms that may be required and to prepare them with information before display. Once loaded into memory, the form's controls and any program code can be used. When working with forms in VB, it is important to note that any reference to an object will cause that object to load.

The Load statement does not have to be explicitly used before an object can be used. An example of this would be if a form's Caption property were set, as follows:. Notice that this is the only line of code that you need to be concerned with.

Opening, Closing, and Hiding Forms with Visual Basic .NET

There is no Load statement before the Caption property is set. This code directly sets the form's property. This single line of code automatically causes the Form1 object to be loaded into memory. This is often referred to as implicit loading.

loading in vb net

Because the object must be loaded to set the property, VB does exactly that. Implied loading can often cause problems when working on a multiform project.When it's time to wait, we are used to seeing the classic blue progress bar. It is everywhere in Windows and many other applications. However, animations are getting more and more popular. For example, when Firefox loads a page, a small spinning circle appears and shows you that the page is loading.

Let's begin by the presentation of the component I developed. The LoadingCircle uses a timer, and it has two responsibilities: to determine the color of the next spoke, and to redraw the circle at a specified number of milliseconds.

When you use the property RotationSpeedyou modify the timer's property named Interval. Higher the value is, slower will be the rotation. The default rotation speed is 80, so at every 80 milliseconds, the circle will be redrawn. First of all, we need coordinates for each spoke. So, let's review some simple math notions. In order to draw a perfect circle, you have to know the following trigonometry concept: the cosines of an angle in degrees give us the X and the sine gives us the Y. The method GetCoordinate computes, for a specified radius and angle, the coordinates of a point.

The method DrawLine uses the coordinates computed by GetCoordinateand draws a line with the two specified points and a color. This component is quite easy to use. Once added to your toolbox, drag it to your form, and you are in business! Now, all you have to do is to play with the properties which change the look of the circle. Those are under the category "LoadingCircle" in the Properties panel.

How to load a assembly (DLL) at runtime in Visual Basic

Also, you can change the Active property to true or false to see the animation running or not. Finally, I wish you will find this component useful. I had fun writing it, and wish you will use it. Thanks for reading this article.The DataSet consists of a collection of DataTable objects that you can relate to each other with DataRelation objects.

loading in vb net

The VB. Also we can populate a combo box from a dataset values. The following VB. Net program fetch the values from database and store it in a dataset and later bind to a combobox.

Enum provide a better way in which to create a group of related constants that can be grouped as strings or integer values. When these values are bind to a ComboBox, the end user can select an option directly from a list of the Enum strings. A Dictionary class is a data structure that represents a collection of keys and values pair of data. The key is identical in a key-value pair and it can have at most one value in the dictionary, but a value can be associated with many different keys.

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Net program populating a Combobox from a Dictionary. Home C VB. How to populate a combo box from a dataset in VB.

loading in vb net

Bind data source to ComboBox ComboBox1. Tables 0 ComboBox1. SelectedValue The following VB. Imports System. Data Imports System. Object, ByVal e As System.

EventArgs Handles MyBase. Fill ds adapter. Dispose command. Dispose connection. Close ComboBox1. Show "Can not open connection! EventArgs Handles Button1. Click MsgBox ComboBox1. Net Enum provide a better way in which to create a group of related constants that can be grouped as strings or integer values.

Data Binding an Enum with Descriptions comboBox1. GetValues typeof Colors ; comboBox1. Green; The follwoing VB. Net program bind a combobox with Enum values.

Load ComboBox1. Click MessageBox. Show ComboBox1.NET framework, the Icon class represents a Windows icon, which is a small bitmap image used to represent an object. The icon class is defined in System. Drawing namespace. So before using Icon class, you need to reference the System.

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Drawing namespace to your application. You can set icon of a form at run-time as well as at design-time. You use a form's Icon property to set form's icon at design-time. Which actually adds two lines to your source code: Dim resources As New System.

Icon"System. Icon Creating an Icon Object at run-time. You can create an icon object at run-time and set it as icon of a Form. You use Icon constructor to create an icon object. The Icon constructor is an overloaded method: In this sample example, I load tst.

Dim ico As New System. Home Explore Tags Contribute. Loading a Form Icon in VB. Posted in VB. Tags: VB. In this article, I will show you how to load an icon of a Form programmatically.

The Form Load Event in VB .NET

NET VB. NET- String. Compare method Enumertors in VB. NET Registry.

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GetValue in VB. NET Use the Err. Number in VB. Lf in VB. NET Use of Registry. SetValue in VB.

loading in vb net

CurrentUser in VB. NET using VB. All rights reserved.The ComboBox control is used to display a drop-down list of various items. It is a combination of a text box in which the user enters an item and a drop-down list from which the user selects an item. Let's create a combo box by dragging a ComboBox control from the Toolbox and dropping it on the form. You can populate the list box items either from the properties window or at runtime.

To add items to a ComboBox, select the ComboBox control and go to the properties window for the properties of this control. Click the ellipses This opens the String Collection Editor dialog box, where you can enter the values one at a line. Gets or sets a custom System. Gets or sets the height in pixels of the drop-down portion of the ComboBox.

Gets or sets the maximum number of characters a user can enter in the editable area of the combo box. Prevents the control from drawing until the EndUpdate method is called, while items are added to the combo box one at a time. In this example, let us fill a combo box with various items, get the selected items in the combo box and show them in a list box and sort the items.

Drag and drop a combo box to store the items, a list box to display the selected items, four button controls to add to the list box with selected items, to fill the combo box, to sort the items and to clear the combo box list, respectively. Net - ComboBox Control Advertisements. Previous Page. Next Page. Previous Page Print Page.

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AllowSelection Gets a value indicating whether the list enables selection of list items. AutoCompleteMode Gets or sets an option that controls how automatic completion works for the ComboBox. AutoCompleteSource Gets or sets a value specifying the source of complete strings used for automatic completion. DropDownWidth Gets or sets the width of the of the drop-down portion of a combo box.

DroppedDown Gets or sets a value indicating whether the combo box is displaying its drop-down portion. Items Gets an object representing the collection of the items contained in this ComboBox.

MaxDropDownItems Gets or sets the maximum number of items to be displayed in the drop-down part of the combo box. MaxLength Gets or sets the maximum number of characters a user can enter in the editable area of the combo box.Need support for your remote team? Check out our new promo! IT issues often require a personalized solution. Why EE? Get Access. Log In. Web Dev. NET App Servers. We help IT Professionals succeed at work.

Show progress of a loading form in vb. Medium Priority. Last Modified: Hi all, I would like to know how can I create a progress bar that will show the progress of a loading form in vb. I have a form with lots of procedures running while it loads, I don't have a way to know the progress of the loading progress. Thanks in advance! Start Free Trial. View Solutions Only. Top Expert This award recognizes someone who has achieved high tech and professional accomplishments as an expert in a specific topic.

Commented: You can add a frmStartupthat you use to the launch process. Show Application. DoEvents After this just add some values to your progressbar between your process and close it in the end of the routine.

Author Commented: Hi jpaulino, the problem is that I don't know which values to add to the progress bar, it's something that depends on the user machine's performance I hope you know what I mean. So how can I get the progress bar to continue progressing correctly if I don't know which values to put between 0 and ? It has to be something more low - level I think. Thanks again, nahumba.

Bob Learned. Experts with Gold status have received one of our highest-level Expert Awards, which recognize experts for their valuable contributions.

Most Valuable Expert This award recognizes tech experts who passionately share their knowledge with the community and go the extra mile with helpful contributions. Hi Bob, What do you mean Marquee?An important event you'll want to write code for is the Form Load event.

You might want to, for example, set the Enabled property of a control to False when a form loads. Or maybe blank out an item on your menu. You can do all this from the Form Load event.

Add another button to your form for this example, and we'll see how the Form Load event works. If you haven't been folowing along, create a new project and add two buttons to it. A code stub for the Form Load event is then added to your code.

Type in the following as the code for the Load Event:. We'll now up the pace a bit. We'll have a look at just what Objects are, and how you can create your own.

Learn about VB. Bring up your coding window, and select the Form1 Events from the drop down box: In the events drop down box, select Load: A code stub for the Form Load event is then added to your code.

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Type in the following as the code for the Load Event: MessageBox. Show "Form Load Event" Run your programme.

Loading and unloading form in vb.net

You should see the message box display before the Form loads. To switch off your second Button before the Form loads, add this to your code: Button2.

You should see that button is no longer available for clicking on.


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