I have tried to find when my errror of "cannot convert type 'double' to systemevent.args! Can anyone show me the light??

Public Class Form1
    Inherits System.Windows.Forms.Form

#Region " Windows Form Designer generated code "

    Public Sub New()
        MyBase.New()

        'This call is required by the Windows Form Designer.
        InitializeComponent()

        '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
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    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 Label2 As System.Windows.Forms.Label
    Friend WithEvents Label3 As System.Windows.Forms.Label
    Friend WithEvents Label4 As System.Windows.Forms.Label
    Friend WithEvents btncalculate As System.Windows.Forms.Button
    Friend WithEvents txtMortgageAmount As System.Windows.Forms.TextBox
    Friend WithEvents txtMortgageTerm As System.Windows.Forms.TextBox
    Friend WithEvents txtInterestRate As System.Windows.Forms.TextBox
    Friend WithEvents txtmortgagepayment As System.Windows.Forms.TextBox
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.txtMortgageAmount = New System.Windows.Forms.TextBox
        Me.txtMortgageTerm = New System.Windows.Forms.TextBox
        Me.txtInterestRate = New System.Windows.Forms.TextBox
        Me.txtmortgagepayment = New System.Windows.Forms.TextBox
        Me.Label2 = New System.Windows.Forms.Label
        Me.Label3 = New System.Windows.Forms.Label
        Me.Label4 = New System.Windows.Forms.Label
        Me.btncalculate = New System.Windows.Forms.Button
        Me.SuspendLayout()
        '
        'txtMortgageAmount
        '
        Me.txtMortgageAmount.CausesValidation = False
        Me.txtMortgageAmount.Location = New System.Drawing.Point(256, 56)
        Me.txtMortgageAmount.MaxLength = 20
        Me.txtMortgageAmount.Multiline = True
        Me.txtMortgageAmount.Name = "txtMortgageAmount"
        Me.txtMortgageAmount.Size = New System.Drawing.Size(208, 24)
        Me.txtMortgageAmount.TabIndex = 2
        Me.txtMortgageAmount.Text = "Amount"
        '
        'txtMortgageTerm
        '
        Me.txtMortgageTerm.Location = New System.Drawing.Point(256, 120)
        Me.txtMortgageTerm.MaxLength = 4
        Me.txtMortgageTerm.Name = "txtMortgageTerm"
        Me.txtMortgageTerm.Size = New System.Drawing.Size(208, 20)
        Me.txtMortgageTerm.TabIndex = 4
        Me.txtMortgageTerm.Text = "Term"
        '
        'txtInterestRate
        '
        Me.txtInterestRate.Location = New System.Drawing.Point(256, 184)
        Me.txtInterestRate.Name = "txtInterestRate"
        Me.txtInterestRate.Size = New System.Drawing.Size(208, 20)
        Me.txtInterestRate.TabIndex = 6
        Me.txtInterestRate.Text = "Rate"
        '
        'txtmortgagepayment
        '
        Me.txtmortgagepayment.Location = New System.Drawing.Point(280, 304)
        Me.txtmortgagepayment.Name = "txtmortgagepayment"
        Me.txtmortgagepayment.Size = New System.Drawing.Size(152, 20)
        Me.txtmortgagepayment.TabIndex = 8
        Me.txtmortgagepayment.Text = "Result"
        Me.txtmortgagepayment.TextAlign = System.Windows.Forms.HorizontalAlignment.Center
        '
        'Label2
        '
        Me.Label2.BackColor = System.Drawing.Color.FromArgb(CType(128, Byte), CType(128, Byte), CType(255, Byte))
        Me.Label2.Font = New System.Drawing.Font("Microsoft Sans Serif", 9.75!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.Label2.Location = New System.Drawing.Point(32, 48)
        Me.Label2.Name = "Label2"
        Me.Label2.Size = New System.Drawing.Size(208, 40)
        Me.Label2.TabIndex = 1
        Me.Label2.Text = "Enter Amount of Mortage"
        Me.Label2.TextAlign = System.Drawing.ContentAlignment.MiddleCenter
        '
        'Label3
        '
        Me.Label3.BackColor = System.Drawing.Color.FromArgb(CType(128, Byte), CType(128, Byte), CType(255, Byte))
        Me.Label3.Location = New System.Drawing.Point(32, 112)
        Me.Label3.Name = "Label3"
        Me.Label3.Size = New System.Drawing.Size(208, 40)
        Me.Label3.TabIndex = 3
        Me.Label3.Text = "Enter Term of Mortage in Months"
        Me.Label3.TextAlign = System.Drawing.ContentAlignment.MiddleCenter
        '
        'Label4
        '
        Me.Label4.BackColor = System.Drawing.Color.FromArgb(CType(128, Byte), CType(128, Byte), CType(255, Byte))
        Me.Label4.Location = New System.Drawing.Point(32, 176)
        Me.Label4.Name = "Label4"
        Me.Label4.Size = New System.Drawing.Size(208, 40)
        Me.Label4.TabIndex = 5
        Me.Label4.Text = "Enter Intrest Rate as Whole Number"
        Me.Label4.TextAlign = System.Drawing.ContentAlignment.MiddleCenter
        '
        'btncalculate
        '
        Me.btncalculate.Location = New System.Drawing.Point(256, 248)
        Me.btncalculate.Name = "btncalculate"
        Me.btncalculate.Size = New System.Drawing.Size(200, 23)
        Me.btncalculate.TabIndex = 9
        Me.btncalculate.Text = "Calculate!"
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(744, 382)
        Me.Controls.Add(Me.btncalculate)
        Me.Controls.Add(Me.Label4)
        Me.Controls.Add(Me.Label3)
        Me.Controls.Add(Me.Label2)
        Me.Controls.Add(Me.txtmortgagepayment)
        Me.Controls.Add(Me.txtInterestRate)
        Me.Controls.Add(Me.txtMortgageTerm)
        Me.Controls.Add(Me.txtMortgageAmount)
        Me.Name = "Form1"
        Me.Text = "Mortage Calculator"
        Me.ResumeLayout(False)

    End Sub

#End Region

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        'This form will allow a user to calculate the mortage payment amount based upon user input.
        'Created by Abdel Chehade II
        'Release Version 1.03
        'Revision date 9/24/04

    End Sub
    Private Sub TextBox4_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles txtmortgagepayment.TextChanged

        'This calculates the mortgage
        'Using the formula
        'Principal*MonthInt/ (1-(1/(1+MonthInt))^(Years*12))

    End Sub
    Private Sub TextBox1_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles txtMortgageAmount.TextChanged

    End Sub

    Private Sub TextBox3_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles txtInterestRate.TextChanged

    End Sub

    Private Sub btncalculate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btncalculate.Click


        Dim Years As Double, Payment As Double
        Dim MonthInt As Double, Amount As Double
        Dim Percent As Double, Principal As Double
        Dim Numerator As Double, Denominator As Double


        'Get Info from user

        Years = Val(txtMortgageTerm.Text)
        Principal = Val(txtMortgageAmount.Text)
        Percent = Val(txtInterestRate.Text) / 100
        MonthInt = Percent / 12

        Numerator = Principal * MonthInt
        Denominator = 1 - (1 / (1 + MonthInt)) ^ (Years * 12)
        Payment = Numerator / Denominator
        txtmortgagepayment.Text = Str(Payment)


        OnClick(Principal * MonthInt / (1 - (1 / (1 + MonthInt)) ^ (Years * 12)))




    End Sub

    Private Sub Form1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles MyBase.Click

    End Sub
End Class

Perhaps you've already tried this, but I would suggest stepping through the code one line at a time. You should then be able to narrow down where in your code the error occurs.

If you still can't figure out what's causing the problem then, post just the segment of code where the error occurs and highlight the line where it happens so it's not necessary to wade through unrealted code.

It would be helpful to know where the error occurs. When you want to run your program press F5 this will start the program with debugging. When the error occurs click break. The line of code that caused the error will be hilighted.

This is the line giving you that error. Why do you have this in there?

J