Introduction to Controls in VB.NET

In this Article we demonstrate the basic concept of control,control class and how to use Controls
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A control is a visual Basic object that can be placed on the form to Construct GUI(Graphical User Interface ). The standard objectToolBox contains all these objects that can be used in Constructing a GUI. Some examples of the Controls are  Buttons,TextBoxes,Labels,Radio Buttons, etc.Control class works as a base class for all the Controls

Each Control contains two basic Features:

  • Properties:- define particular characteristics of the object and
  • Methods:-are the predefined procedures that are supplied with the object for performing specific tasks.

You can select the controls from ToolBox.You can find the properties of the control by selecting View and then Properties Windoow from the main menu.

Way to Create form with Controls

To create a Form select File then New then Project then Visual Basic Projects and select Windows Control Library from the templates and click OK.After that you can add user control to the existing project by selecting Project then Add User Control The image below displays the new project dialogue to add a User Control project.

The form will display after clicking OK and will look like the image below.

Control1.gif

 Now You Drag a Label and a TextBox control from the toolbox onto the form. The image below looks like.

Control2.gif

Double-click the form to open it's code behind file. In the code behind file type the following code under End Sub of UserControl1 to set the property of the user control.
 

Public Class Form2
    Private Sub Form2_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
    End Sub
    Public Property sanText() As String
        Get
            sanText = TextBox1.Text
        End Get
        Set(ByVal Value As String)
            TextBox1.Text = Value
        End Set
    End Property
    Public Property sanLbl() As String
        Get
            sanLbl = Label1.Text
        End Get
        Set(ByVal Value As String)
            Label1.Text = Value
        End Set
    End
Property
End Class

Output:

Control3.gif

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