Question

I am working on a personal project on visual basic express 2010 and i was wondering how to add and subtract numbers together in code using buttons a user can press like a basketball scoreboard
Thanks

Answer 1

Form1.vb

Public Class mainForm
    ''' <summary>
    ''' Add two numbers
    ''' </summary>
    ''' <param name="sender"/><param name="e"/><param name="e"/><remarks></remarks>
    Private Sub btn_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn.Click
        Dim result As Double = Double.Parse(txtFirstNumber.Text) + Double.Parse(txtSecondNumber.Text)
        'show result
        txtResult.Text = result.ToString()
    End Sub
    ''' <summary>
    ''' Subtract two numbers
    ''' </summary>
    ''' <param name="sender"/><param name="e"/><param name="e"/><remarks></remarks>
    Private Sub btnSubtract_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSubtract.Click
        Dim result As Double = Double.Parse(txtFirstNumber.Text) - Double.Parse(txtSecondNumber.Text)
        'show result
        txtResult.Text = result.ToString()
    End Sub
End Class

Form1.Designer.vb

<Global.Microsoft.VisualBasic.CompilerServices.DesignerGenerated()> _
Partial Class mainForm
    Inherits System.Windows.Forms.Form
    'Form overrides dispose to clean up the component list.
    <System.Diagnostics.DebuggerNonUserCode()> _
    Protected Overrides Sub Dispose(ByVal disposing As Boolean)
        Try
            If disposing AndAlso components IsNot Nothing Then
                components.Dispose()
            End If
        Finally
            MyBase.Dispose(disposing)
        End Try
    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.
    <System.Diagnostics.DebuggerStepThrough()> _
    Private Sub InitializeComponent()
        Me.Label1 = New System.Windows.Forms.Label()
        Me.btn = New System.Windows.Forms.Button()
        Me.btnSubtract = New System.Windows.Forms.Button()
        Me.txtFirstNumber = New System.Windows.Forms.TextBox()
        Me.Label2 = New System.Windows.Forms.Label()
        Me.txtSecondNumber = New System.Windows.Forms.TextBox()
        Me.Label3 = New System.Windows.Forms.Label()
        Me.txtResult = New System.Windows.Forms.TextBox()
        Me.SuspendLayout()
        '
        'Label1
        '
        Me.Label1.AutoSize = True
        Me.Label1.Location = New System.Drawing.Point(23, 33)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(92, 13)
        Me.Label1.TabIndex = 0
        Me.Label1.Text = "Enter first number:"
        '
        'btn
        '
        Me.btn.Location = New System.Drawing.Point(87, 126)
        Me.btn.Name = "btn"
        Me.btn.Size = New System.Drawing.Size(75, 23)
        Me.btn.TabIndex = 1
        Me.btn.Text = "Add"
        Me.btn.UseVisualStyleBackColor = True
        '
        'btnSubtract
        '
        Me.btnSubtract.Location = New System.Drawing.Point(168, 126)
        Me.btnSubtract.Name = "btnSubtract"
        Me.btnSubtract.Size = New System.Drawing.Size(75, 23)
        Me.btnSubtract.TabIndex = 1
        Me.btnSubtract.Text = "Subtract"
        Me.btnSubtract.UseVisualStyleBackColor = True
        '
        'txtFirstNumber
        '
        Me.txtFirstNumber.Location = New System.Drawing.Point(143, 30)
        Me.txtFirstNumber.Name = "txtFirstNumber"
        Me.txtFirstNumber.Size = New System.Drawing.Size(100, 20)
        Me.txtFirstNumber.TabIndex = 2
        '
        'Label2
        '
        Me.Label2.AutoSize = True
        Me.Label2.Location = New System.Drawing.Point(23, 59)
        Me.Label2.Name = "Label2"
        Me.Label2.Size = New System.Drawing.Size(105, 13)
        Me.Label2.TabIndex = 0
        Me.Label2.Text = "Enter second number:"
        '
        'txtSecondNumber
        '
        Me.txtSecondNumber.Location = New System.Drawing.Point(143, 56)
        Me.txtSecondNumber.Name = "txtSecondNumber"
        Me.txtSecondNumber.Size = New System.Drawing.Size(100, 20)
        Me.txtSecondNumber.TabIndex = 2
        '
        'Label3
        '
        Me.Label3.AutoSize = True
        Me.Label3.Location = New System.Drawing.Point(23, 85)
        Me.Label3.Name = "Label3"
        Me.Label3.Size = New System.Drawing.Size(40, 13)
        Me.Label3.TabIndex = 0
        Me.Label3.Text = "Result:"
        '
        'txtResult
        '
        Me.txtResult.Location = New System.Drawing.Point(143, 82)
        Me.txtResult.Name = "txtResult"
        Me.txtResult.Size = New System.Drawing.Size(100, 20)
        Me.txtResult.TabIndex = 2
        '
        'mainForm
        '
        Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
        Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
        Me.ClientSize = New System.Drawing.Size(260, 167)
        Me.Controls.Add(Me.txtResult)
        Me.Controls.Add(Me.txtSecondNumber)
        Me.Controls.Add(Me.txtFirstNumber)
        Me.Controls.Add(Me.Label3)
        Me.Controls.Add(Me.btnSubtract)
        Me.Controls.Add(Me.Label2)
        Me.Controls.Add(Me.btn)
        Me.Controls.Add(Me.Label1)
        Me.MaximizeBox = False
        Me.MinimizeBox = False
        Me.Name = "mainForm"
        Me.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen
        Me.Text = "Main form"
        Me.ResumeLayout(False)
        Me.PerformLayout()
    End Sub
    Friend WithEvents Label1 As System.Windows.Forms.Label
    Friend WithEvents btn As System.Windows.Forms.Button
    Friend WithEvents btnSubtract As System.Windows.Forms.Button
    Friend WithEvents txtFirstNumber As System.Windows.Forms.TextBox
    Friend WithEvents Label2 As System.Windows.Forms.Label
    Friend WithEvents txtSecondNumber As System.Windows.Forms.TextBox
    Friend WithEvents Label3 As System.Windows.Forms.Label
    Friend WithEvents txtResult As System.Windows.Forms.TextBox
End Class

Form1

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