Creating Simple Windows application using VB.NET
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This video tutorial shows how to develop a simple windows application in VB.NET using an example simple interest. This tutorial will also familiarize you with developing a basic windows form application in VB.NET. 

Source Code
Public Class Form1
    Inherits System.Windows.Forms.Form

#Region " Windows Form Designer generated code "

    Public Sub New()

        'This call is required by the Windows Form Designer.

        'Add any initialization after the InitializeComponent() call

    End Sub

    'Form overrides dispose to clean up the component list.
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
            End If
        End If
    End Sub

    'Required by the Windows Form Designer
    Private components As System.ComponentModel.IContainer

    'NOTE: The following procedure is required by the Windows Form Designer
    'It can be modified using the Windows Form Designer.  
    'Do not modify it using the code editor.
    Friend WithEvents ButtonCalculate As System.Windows.Forms.Button
    Friend WithEvents TextBoxPrincipalAmount As System.Windows.Forms.TextBox
    Friend WithEvents Label1 As System.Windows.Forms.Label
    Friend WithEvents Label2 As System.Windows.Forms.Label
    Friend WithEvents Label3 As System.Windows.Forms.Label
    Friend WithEvents Label4 As System.Windows.Forms.Label
    Friend WithEvents TextBoxNoOfMonths As System.Windows.Forms.TextBox
    Friend WithEvents TextBoxInterestPerMonth As System.Windows.Forms.TextBox
    Friend WithEvents TextBoxTotal As System.Windows.Forms.TextBox
    Friend WithEvents ButtonClose As System.Windows.Forms.Button
    Friend WithEvents MainMenu1 As System.Windows.Forms.MainMenu
    Friend WithEvents MenuItem1 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem2 As System.Windows.Forms.MenuItem
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.ButtonCalculate = New System.Windows.Forms.Button
        Me.TextBoxPrincipalAmount = New System.Windows.Forms.TextBox
        Me.Label1 = New System.Windows.Forms.Label
        Me.Label2 = New System.Windows.Forms.Label
        Me.Label3 = New System.Windows.Forms.Label
        Me.Label4 = New System.Windows.Forms.Label
        Me.TextBoxNoOfMonths = New System.Windows.Forms.TextBox
        Me.TextBoxInterestPerMonth = New System.Windows.Forms.TextBox
        Me.TextBoxTotal = New System.Windows.Forms.TextBox
        Me.ButtonClose = New System.Windows.Forms.Button
        Me.MainMenu1 = New System.Windows.Forms.MainMenu
        Me.MenuItem1 = New System.Windows.Forms.MenuItem
        Me.MenuItem2 = New System.Windows.Forms.MenuItem
        Me.ButtonCalculate.Location = New System.Drawing.Point(142, 206)
        Me.ButtonCalculate.Name = "ButtonCalculate"
        Me.ButtonCalculate.Size = New System.Drawing.Size(64, 23)
        Me.ButtonCalculate.TabIndex = 12
        Me.ButtonCalculate.Text = "Calculate"
        Me.TextBoxPrincipalAmount.Location = New System.Drawing.Point(142, 38)
        Me.TextBoxPrincipalAmount.Name = "TextBoxPrincipalAmount"
        Me.TextBoxPrincipalAmount.Size = New System.Drawing.Size(120, 20)
        Me.TextBoxPrincipalAmount.TabIndex = 10
        Me.TextBoxPrincipalAmount.Text = ""
        Me.Label1.Location = New System.Drawing.Point(30, 38)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(96, 23)
        Me.Label1.TabIndex = 6
        Me.Label1.Text = "Principal Amount"
        Me.Label2.Location = New System.Drawing.Point(30, 78)
        Me.Label2.Name = "Label2"
        Me.Label2.TabIndex = 3
        Me.Label2.Text = "No of Months"
        Me.Label3.Location = New System.Drawing.Point(30, 126)
        Me.Label3.Name = "Label3"
        Me.Label3.TabIndex = 4
        Me.Label3.Text = "Interest / Month"
        Me.Label4.Location = New System.Drawing.Point(30, 166)
        Me.Label4.Name = "Label4"
        Me.Label4.TabIndex = 5
        Me.Label4.Text = "Total"
        Me.TextBoxNoOfMonths.Location = New System.Drawing.Point(142, 78)
        Me.TextBoxNoOfMonths.Name = "TextBoxNoOfMonths"
        Me.TextBoxNoOfMonths.Size = New System.Drawing.Size(120, 20)
        Me.TextBoxNoOfMonths.TabIndex = 9
        Me.TextBoxNoOfMonths.Text = ""
        Me.TextBoxInterestPerMonth.Location = New System.Drawing.Point(142, 118)
        Me.TextBoxInterestPerMonth.Name = "TextBoxInterestPerMonth"
        Me.TextBoxInterestPerMonth.Size = New System.Drawing.Size(120, 20)
        Me.TextBoxInterestPerMonth.TabIndex = 7
        Me.TextBoxInterestPerMonth.Text = ""
        Me.TextBoxTotal.Location = New System.Drawing.Point(142, 158)
        Me.TextBoxTotal.Name = "TextBoxTotal"
        Me.TextBoxTotal.Size = New System.Drawing.Size(120, 20)
        Me.TextBoxTotal.TabIndex = 8
        Me.TextBoxTotal.Text = ""
        Me.ButtonClose.Location = New System.Drawing.Point(214, 206)
        Me.ButtonClose.Name = "ButtonClose"
        Me.ButtonClose.Size = New System.Drawing.Size(48, 23)
        Me.ButtonClose.TabIndex = 11
        Me.ButtonClose.Text = "Close"
        Me.MainMenu1.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {Me.MenuItem1})
        Me.MenuItem1.Index = 0
        Me.MenuItem1.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {Me.MenuItem2})
        Me.MenuItem1.Text = "Function"
        Me.MenuItem2.Index = 0
        Me.MenuItem2.Text = "Calculate"
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(292, 266)
        Me.Menu = Me.MainMenu1
        Me.Name = "Form1"
        Me.Text = "Form1"

    End Sub

#End Region

    Private Sub ButtonCalculate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ButtonCalculate.Click
    End Sub
    Private Sub Calculate()
        Dim total As Double
        total = (CType(TextBoxPrincipalAmount.Text, Double) + (CType(TextBoxNoOfMonths.Text, Double)) * (CType(TextBoxInterestPerMonth.Text, Double)))
        TextBoxTotal.Text = CType(total, String)
    End Sub

    Private Sub MenuItem2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem2.Click
        Calculate() 'calling the function Calculate()
    End Sub

    Private Sub ButtonClose_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ButtonClose.Click
        Me.Close() 'closes the form
    End Sub
End Class

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