Public Class Form1
Private textfile As String = Application.StartupPath &
"\textfile.txt"
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MyBase.Load
cbcourse.Items.Add("BCA")
cbcourse.Items.Add("MCA")
cbcourse.Items.Add("BBA")
cbcourse.Items.Add("MBA")
cbyear.Items.Add("First")
cbyear.Items.Add("Second")
cbyear.Items.Add("Third")
End Sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button1.Click
If ListView1.Items.Count = 0 Then
Dim item1 As ListViewItem
item1 = ListView1.Items.Add(TextBox1.Text)
item1.SubItems.Add(TextBox2.Text)
item1.SubItems.Add(cbcourse.Text)
item1.SubItems.Add(cbyear.Text)
item1 = Nothing
Else
With ListView1
Dim additem As ListViewItem
additem = .FindItemWithText(TextBox1.Text, True, 0, True)
If Not additem Is Nothing Then
MessageBox.Show("Student" &TextBox1.Text &"already in the
course","course list", MessageBoxButtons.YesNo, MessageBoxIcon.Question)
Else
Dim item1 As ListViewItem
item1 = ListView1.Items.Add(TextBox1.Text)
item1.SubItems.Add(TextBox2.Text)
item1.SubItems.Add(cbcourse.Text)
item1.SubItems.Add(cbyear.Text)

item1 = Nothing
End If
End With

End If
clear()
End Sub
Private Sub clear()
cbcourse.Text =""
cbyear.Text =""
TextBox1.Clear()
TextBox2.Clear()
End Sub
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button2.Click
clear()
End Sub
Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button3.Click
Dim iExit As DialogResult
iExit = MessageBox.Show("confirm if you want to exit","close application",
MessageBoxButtons.YesNo, MessageBoxIcon.Question)
If iExit = DialogResult.Yes Then
Application.Exit()
End If
End Sub
Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button4.Click
Dim item1 As ListViewItem
item1 = ListView1.SelectedItems(0)
item1.Remove()
End Sub

Private Sub Button5_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button5.Click
Dim mywriter As New IO.StreamWriter(textfile)
For Each item1 As ListViewItem In ListView1.Items
mywriter.WriteLine(item1.Text &"*" &item1.SubItems(1).Text &"*"&
item1.SubItems(2).Text &"*"&"*"&item1.SubItems(3).Text)
Next
mywriter.Close()
End Sub
Private Sub ListView1_SelectedIndexChanged(ByVal sender As
System.Object, ByVal e As System.EventArgs) Handles
ListView1.SelectedIndexChanged
End Sub
End Class

Visual basic (VB.net) Online Compiler

Write, Run & Share VB.net code online using OneCompiler's VB.net online compiler for free. It's one of the robust, feature-rich online compilers for VB.net language, running on the latest version 16. Getting started with the OneCompiler's VB.net compiler is simple and pretty fast. The editor shows sample boilerplate code when you choose language as VB.net. OneCompiler also has reference programs, where you can look for the sample code to get started with.

Read input from STDIN in VB.net

OneCompiler's VB.net online editor supports stdin and users can give inputs to programs using the STDIN textbox under the I/O tab. Following is a sample VB.net program which takes name as input and prints hello message with your name.

Public Module Program
	Public Sub Main(args() As string)
	 Dim name as String = Console.ReadLine()    ' Reading input from STDIN
   Console.WriteLine("Hello " & name)           ' Writing output to STDOUT
	End Sub
End Module

About VB.net

Visual Basic is a event driven programming language by Microsoft, first released in the year 1991.

Key Features

  • Beginner's friendly language.
  • Simple and object oriented programming language.
  • User friendly language and easy to develop GUI based applications.

Syntax help

Variables

Variable is a name given to the storage area in order to identify them in our programs.

Simple syntax of Variable declaration is as follows

Dim variableName [ As [ New ] dataType ] [ = initializer ]

Variable initialization

variableName = value

Conditional Statements

1. If

If condition-expression Then 
    'code
End If

2. If-else

If(conditional-expression)Then
   'code if the conditional-expression is true 
Else
  'code if the conditional-expression is false 
End If

3. If-else-if ladder

If(conditional-expression)Then
   'code if the above conditional-expression is true 
Else If(conditional-expression) Then
        'code if the above conditional-expression is true 
    Else
        'code if the above conditional-expression is false 
End If

4. Nested-If

If(conditional-expression)Then
   'code if the above conditional-expression is true
   If(conditional-expression)Then
         'code if the above conditional-expression is true 
   End If
End If

5. Select Case

Select [ Case ] expression
   [ Case expressionlist
      'code ]
   [ Case Else
      'code ]
End Select

Loops

1. For..Next

For counter [ As datatype ] = begin To end [ Step step ]
   'code
   [ Continue For ]
   'code
   [ Exit For ]
   'code
Next [ counter ]

2. For..Each

For Each element [ As datatype ] In group
   'code
   [ Continue For ]
   'code
   [ Exit For ]
   'code
Next [ element ]

3. While

While conditional-expression
   'Code 
   [ Continue While ]
   'Code
   [ Exit While ]
   'Code
End While

4. Do-while

Do { While | Until } conditional-expression
   'Code
   [ Continue Do ]
   'Code
   [ Exit Do ]
   'Code
Loop

Do
   'Code
   [ Continue Do ]
   'Code
   [ Exit Do ]
   'Code
Loop { While | Until } conditional-expression

Procedures

Procedure is a sub-routine which contains set of statements. Usually Procedures are written when multiple calls are required to same set of statements which increases re-usuability and modularity.

Procedures are of two types.

1. Functions

Functions return a value when they are called.

[accessModifiers] Function functionName [(parameterList)] As returnType
   'code
End Function

2. Sub-Procedures

Sub-procedures are similar to functions but they don't return any value.

Sub ProcedureName (parameterList)
'Code
End Sub