CheckBox Control in VB.net – Properties, Methods and Events

What is CheckBox Control in VB.net?

The CheckBox Control in VB.net is a control that lets the user select or deselect alternatives from the list of choices.

A checkmark or tick will show up on the Windows form when a checkbox is chosen.

In this lesson, we shall learn How To Write a Program for CheckBox in VB.net.

Let’s create CheckBoxes in VB.net by dragging CheckBox controls from the Toolbox and dropping them on the form.

The three possible states for the CheckBox Control in VB.net are checked, unchecked, and indeterminate.

The checkbox is grayed out in the uncertain condition.

The check box’s Three State property is set to True to enable the indeterminate state.

Properties of CheckBox Control in VB.net

The following given below are some commonly used Properties of the CheckBox Control in VB.net.

#	CheckBox Control in VB.net Properties	Description
1.	Default	It is used to get the default size of the checkbox.
2.	AutoCheck	The AutoCheck property is used to check whether the checked value or appearance of control can be automatically changed when the user clicked on the CheckBox control.
3.	CheckAlign	It is used to set the checkmark’s alignment, such as horizontal or vertical on the checkbox.
4.	Appearance	The Appearance property is used to display the appearance of a checkbox control by setting a value.
5.	CheckState	The CheckState property is used to verify whether the checkbox status is checked in the window form.
6.	ThreeState	The ThreeState property is used to check whether the control allows one to set three check positions instead of two by setting values.
7.	FlatStyle	It is used to obtain or set the flat appearance of a checkbox.

Methods of CheckBox Control in VB.net

The following given below are some commonly used Methods of CheckBox Control in VB.net.

#	CheckBox Control in VB.net Methods	Description
1.	OnClick	The OnClick method is used to fetch the Click event in the CheckBox control.
2.	OnCheckStateChanged	It is used to call the CheckStateChanged event in the CheckBox control.
3.	ToString	The ToString method is used to return the current string of the CheckBox control.
4.	OnCheckedChanged	When the Checked property is changed in the CheckBox control, the OnCheckedChanged events occur.
5.	OnMouseUp	It is used when it receives the OnMouseUp event in the CheckBox control.

Events of CheckBox Control in VB.net

The following given below are some commonly used Events of the CheckBox Control in VB.net.

#	CheckBox Control in VB.net Event	Description
1.	CheckedChanged	The CheckedChanged event is found when the value of the checked property is changed to CheckBox.
2.	DoubleClick	It occurs when the user performs a double click on the CheckBox control.
3.	CheckStateChanged	It occurs when the value of the CheckState property changes to the CheckBox control.
4.	AppearanceChanged	It occurs when the property of the Appearance is changed to the CheckBox control.

CheckBox Windows Form

Let’s create a program to understand the uses of CheckBox control in VB.net Windows Form.

Public Class Form1
    Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
        Dim prog As String
        prog = " "
        If CheckBox1.Checked = True Then
            prog = "Python"
        End If
        If CheckBox2.Checked = True Then
            'fruit = CheckBox2.Text  
            prog = prog & "," & " VB.net"
        End If
        If CheckBox3.Checked = True Then
            prog = prog & "," & " Java"
        End If
        If CheckBox4.Checked = True Then
            prog = prog & "," & " PHP"
        End If
        If CheckBox5.Checked = True Then
            prog = prog & "," & " JavaScript"
        End If
        If CheckBox6.Checked = True Then
            prog = prog & "," & " C/C++"
        End If
        If CheckBox7.Checked = True Then
            prog = prog & "," & " C#"
        End If
        If CheckBox8.Checked = True Then
            prog = prog & "," & " ASP.net"
        End If
        If prog.Length <> 0 Then
            MsgBox(" Selected Programming languages: " & prog)
        End If
        CheckBox1.ThreeState = True
    End Sub
End Class

Program Output:

Now select the Most Programming Language Used by clicking on the items.

Now click on the Submit button, it displays the following output on your screen.

Difference Between Option Button and CheckBox in VB.net

The Difference Between Option Button and CheckBox in VB.net, You can choose more than one item in the Check box.

If you click a radio button, a small dot appears in the center of the circle.

if you click a check box, a small checkmark appears in the center of the square.

If you click a different choice, the dot will move to the center of the new circle that you have selected in the radio button.

if you click a check box, another check appears in the new box, and the frog will appear.

Summary

In this article we have discussed how to create a program for CheckBox in VB.net using Microsoft Visual Studio, we have learned how to use and manage the different Properties, Methods, and Events of the CheckBox in VB.net.

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