Public Class Form1

    Private Sub TextBox1_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles txtBox1.TextChanged

    End Sub


    Private Sub btnsubtract_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnsubtract.Click
        Dim number1 As Integer
        Dim number2 As Integer
        number1 = txtBox1.Text
        number2 = txtBox2.Text

        txtResult.Text = number1 - number2
    End Sub

    Private Sub btnmultiply_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnmultiply.Click
        Dim number1 As Integer
        Dim number2 As Integer
        number1 = txtBox1.Text
        number2 = txtBox2.Text

        txtResult.Text = number1 * number2
    End Sub

    Private Sub btndivide_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btndivide.Click
        Dim number1 As Integer
        Dim number2 As Integer
        number1 = txtBox1.Text
        number2 = txtBox2.Text

        txtResult.Text = number1 / number2
    End Sub

    Private Sub btnadd_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnadd.Click
        Dim number1 As Integer
        Dim number2 As Integer
        number1 = txtBox1.Text
        number2 = txtBox2.Text

        txtResult.Text = number1 + number2
    End Sub

    Private Sub btnClear_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnClear.Click
        txtBox1.Clear()
        txtBox2.Clear()
        txtResult.Clear()
    End Sub

    Private Sub btneven_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btneven.Click


        If IsEven(Val(txtBox1.Text)) Then
            txtResult.Text = "it Is Even"
        Else
            txtResult.Text = "it is Odd"
        End If
    End Sub

Public Function IsEven(ByVal Number As Long) As Boolean
    IsEven = (Number Mod 2 = 0)
    End Function

    Private Sub btnAverage_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnAverage.Click
        txtResult.Text = Val(txtResult.Text) / 2
    End Sub

    Private Sub btnMax3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnMax3.Click
        Dim box1 As Integer
        Dim box2 As Integer
        Dim box3 As Integer
        box1 = txtBox1.Text
        box2 = txtBox2.Text
        box3 = txtBox3.Text
        If box1 > box2 Then txtResult.Text = box1 Else txtResult.Text = box2
    End Sub

    Private Sub btnMax2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnMax2.Click
        Dim a As Integer
        Dim b As Integer
        a = txtBox1.Text
        b = txtBox2.Text
        If (a > b) Then
            txtResult.Text = "First Number " & a
        Else
            txtResult.Text = "second number " & b

        End If
        Return
    End Sub
End Class