 
Public Class frmcalculator
    Dim Operand1 As Double
    Dim Operand2 As Double
    Dim [Operator] As String

    Private Sub btn1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn1.Click, btn2.Click, btn3.Click, btn4.Click, btn5.Click, btn6.Click, btn7.Click, btn8.Click, btn9.Click, Button2.Click
        txtsource.Text = txtsource.Text & sender.text
    End Sub

    Private Sub btnclear_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
        txtsource.Text = ""
    End Sub

    Private Sub btnadd_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnadd.Click
        Operand1 = Val(txtsource.Text)
        txtsource.Text = ""
        txtsource.Focus()
        [Operator] = "+"
    End Sub


    Private Sub btndecimal_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        If InStr(txtsource.Text, ".") > 0 Then
            Exit Sub
        Else
            txtsource.Text = txtsource.Text & "."
        End If
    End Sub

    Private Sub btnequals_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click
        Dim Result As Double
        Operand2 = Val(txtsource.Text)

        'If [Operator] = "+" Then
        '    Result = Operand1 + Operand2
        'ElseIf [Operator] = "-" Then
        '    Result = Operand1 - Operand2
        'ElseIf [Operator] = "/" Then
        '    Result = Operand1 / Operand2
        'ElseIf [Operator] = "*" Then
        '    Result = Operand1 * Operand2
        'End If

        Select Case [Operator]
            Case "+"
                Result = Operand1 + Operand2
                MsgBox(Result.ToString("#,###.00"), MsgBoxStyle.Information, "Result")
                txtsource.Text = Result.ToString("#,###.00")
            Case "-"
                Result = Operand1 - Operand2
                MsgBox(Result.ToString("#,###.00"), MsgBoxStyle.Information, "Result")
                txtsource.Text = Result.ToString("#,###.00")
            Case "/"
                Result = Operand1 / Operand2
                MsgBox(Result.ToString("#,###.00"), MsgBoxStyle.Information, "Result")
                txtsource.Text = Result.ToString("#,###.00")
            Case "*"
                Result = Operand1 * Operand2
                MsgBox(Result.ToString("#,###.00"), MsgBoxStyle.Information, "Result")
                txtsource.Text = Result.ToString("#,###.00")
        End Select

        txtsource.Text = Result.ToString("#,###.00")

    End Sub

    Private Sub btnminus_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnminus.Click
        Operand1 = Val(txtsource.Text)
        txtsource.Text = ""
        txtsource.Focus()
        [Operator] = "-"
    End Sub

    Private Sub btnmultiply_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnmultiply.Click
        Operand1 = Val(txtsource.Text)
        txtsource.Text = ""
        txtsource.Focus()
        [Operator] = "*"
    End Sub

    Private Sub btndivide_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btndivide.Click
        Operand1 = Val(txtsource.Text)
        txtsource.Text = ""
        txtsource.Focus()
        [Operator] = "/"
    End Sub

    Private Sub btnaddminus_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button9.Click
        txtsource.Text = -1 * txtsource.Text
    End Sub
    Private Sub btnx_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnx.Click
        Dim convert As Single
        If txtsource.Text <> 0 Then
            convert = 1 / Val(txtsource.Text)
            txtsource.Text = convert
        End If
    End Sub
    Private Sub frmcalculator_KeyDown(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles Me.KeyDown
        If e.KeyCode = Keys.Enter Then
            Call btnequals_Click(sender, e)
        End If
    End Sub


    Private Sub frmcalculator_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

    End Sub

    Private Sub GroupBox1_Enter(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles GroupBox1.Enter

    End Sub
End Class

created 5 years ago by Kerolos Emad

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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