Answer to Question #217234 in Visual Basic for Vee

Question

Develop an application with one screen that calculates the monthly salary of an employee. Your application should satisfy the following requirements:

  If the user does not enter anything in the textboxes it must notify you by using a messagebox e.g. MessageBox.Show("Please Enter a value in Pay Rate Field");

 Your formula is as follows (rate * hours)

  Your answers must be displayed only in the messagebox

Answer 1

<Global.Microsoft.VisualBasic.CompilerServices.DesignerGenerated()> _
Partial Class frmMonthlySalary
    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.btnCalculate = New System.Windows.Forms.Button()
        Me.txtRate = New System.Windows.Forms.TextBox()
        Me.Label2 = New System.Windows.Forms.Label()
        Me.txtHours = New System.Windows.Forms.TextBox()
        Me.Label3 = New System.Windows.Forms.Label()
        Me.txtMonthlySalary = New System.Windows.Forms.TextBox()
        Me.SuspendLayout()
        '
        'Label1
        '
        Me.Label1.AutoSize = True
        Me.Label1.Location = New System.Drawing.Point(23, 31)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(56, 13)
        Me.Label1.TabIndex = 0
        Me.Label1.Text = "Enter rate:"
        '
        'btnCalculate
        '
        Me.btnCalculate.Location = New System.Drawing.Point(119, 117)
        Me.btnCalculate.Name = "btnCalculate"
        Me.btnCalculate.Size = New System.Drawing.Size(100, 23)
        Me.btnCalculate.TabIndex = 1
        Me.btnCalculate.Text = "Calculate"
        Me.btnCalculate.UseVisualStyleBackColor = True
        '
        'txtRate
        '
        Me.txtRate.Location = New System.Drawing.Point(119, 28)
        Me.txtRate.Name = "txtRate"
        Me.txtRate.Size = New System.Drawing.Size(100, 20)
        Me.txtRate.TabIndex = 2
        '
        'Label2
        '
        Me.Label2.AutoSize = True
        Me.Label2.Location = New System.Drawing.Point(23, 57)
        Me.Label2.Name = "Label2"
        Me.Label2.Size = New System.Drawing.Size(64, 13)
        Me.Label2.TabIndex = 0
        Me.Label2.Text = "Enter hours:"
        '
        'txtHours
        '
        Me.txtHours.Location = New System.Drawing.Point(119, 54)
        Me.txtHours.Name = "txtHours"
        Me.txtHours.Size = New System.Drawing.Size(100, 20)
        Me.txtHours.TabIndex = 2
        '
        'Label3
        '
        Me.Label3.AutoSize = True
        Me.Label3.Location = New System.Drawing.Point(23, 83)
        Me.Label3.Name = "Label3"
        Me.Label3.Size = New System.Drawing.Size(98, 13)
        Me.Label3.TabIndex = 0
        Me.Label3.Text = "The monthly salary:"
        '
        'txtMonthlySalary
        '
        Me.txtMonthlySalary.Location = New System.Drawing.Point(119, 80)
        Me.txtMonthlySalary.Name = "txtMonthlySalary"
        Me.txtMonthlySalary.ReadOnly = True
        Me.txtMonthlySalary.Size = New System.Drawing.Size(100, 20)
        Me.txtMonthlySalary.TabIndex = 2
        '
        'frmMonthlySalary
        '
        Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
        Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
        Me.ClientSize = New System.Drawing.Size(247, 169)
        Me.Controls.Add(Me.txtMonthlySalary)
        Me.Controls.Add(Me.txtHours)
        Me.Controls.Add(Me.Label3)
        Me.Controls.Add(Me.txtRate)
        Me.Controls.Add(Me.Label2)
        Me.Controls.Add(Me.btnCalculate)
        Me.Controls.Add(Me.Label1)
        Me.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle
        Me.MaximizeBox = False
        Me.MinimizeBox = False
        Me.Name = "frmMonthlySalary"
        Me.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen
        Me.Text = "Monthly Salary"
        Me.ResumeLayout(False)
        Me.PerformLayout()

    End Sub
    Friend WithEvents Label1 As System.Windows.Forms.Label
    Friend WithEvents btnCalculate As System.Windows.Forms.Button
    Friend WithEvents txtRate As System.Windows.Forms.TextBox
    Friend WithEvents Label2 As System.Windows.Forms.Label
    Friend WithEvents txtHours As System.Windows.Forms.TextBox
    Friend WithEvents Label3 As System.Windows.Forms.Label
    Friend WithEvents txtMonthlySalary As System.Windows.Forms.TextBox

End Class

Public Class frmMonthlySalary


    Private Sub btnCalculate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCalculate.Click
        Dim rate As Double
        Dim hours As Double
        Dim monthlySalary As Double
        'If the user does not enter anything in the textboxes it must notify you by using a messagebox e.g. 
        If Double.TryParse(txtRate.Text, rate) = False Or Double.TryParse(txtRate.Text, hours) = False Then
            MessageBox.Show("Please Enter a value in Pay Rate Field")
            Return
        End If
        If Double.TryParse(txtHours.Text, hours) = False Then
            MessageBox.Show("Please Enter a value in hours Field")
            Return
        End If
       
        'Your formula is as follows (rate * hours)
        monthlySalary = rate * hours
        txtMonthlySalary.Text = monthlySalary.ToString("C")
    End Sub
End Class