Programando en .NET

Hoy vamos a hacer una aplicación en Visual Basic .NET; son ejemplos que hice utilizando VB 2008 Express Edition.


Menú del programa
Calculo el promedio, el valor futuro, operaciones básicas aritméticas,ejemplos de estructuras de control, funciones y el salario neto.

Formulario no.1

Public Class Form1 Private Sub PictureBox1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles PictureBox1.Click MsgBox("Mensaje" & vbCrLf & "" & vbCrLf & " Programa elaborado por:" & vbCrLf & "Fernando Carraro Aguirre") End Sub

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

If RadioButton1.Checked = True Then

Form2.Show() Form3.Hide(): Form4.Hide(): Form5.Hide(): Form6.Hide(): Form7.Hide():

End If

If RadioButton2.Checked = True Then Form3.Show(): Form2.Hide(): Form4.Hide(): Form5.Hide():   Form6.Hide(): Form7.Hide():

End If

If RadioButton3.Checked = True Then Form4.Show(): Form3.Hide(): Form2.Hide(): Form5.Hide():   Form6.Hide(): Form7.Hide():

End If

If RadioButton4.Checked = True Then

Form5.Show(): Form4.Hide(): Form3.Hide(): Form2.Hide(): Form6.Hide(): Form7.Hide():

End If If RadioButton5.Checked = True Then Form6.Show() Form5.Hide() Form4.Hide() Form3.Hide() Form2.Hide() Form7.Hide()

End If

If RadioButton6.Checked = True Then Form6.Hide() Form5.Hide() Form4.Hide() Form3.Hide() Form2.Hide() Form7.Show()

End If End Sub

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click

End

End Sub
End Class

Formulario No.2

Public Class Form2

Private Sub PictureBox1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles

PictureBox1.Click MsgBox("Hola a todos " & vbCrLf & "Mensaje" & vbCrLf & "Hola")

End Sub

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

Dim numero As Integer Dim valor As Double Dim i As Integer Dim suma As Double Dim promedio As Double

numero = Val(TextBox1.Text): i = 0 : suma = 0

For i = 1 To

numero valor = Val(InputBox("Valor del elemento" & i, "Promedio en .NET", ""))

suma += valor Next i promedio = suma / numero

Label2.Text = "La suma es " & CStr(suma) & " el promedio obtenido es " & CStr(promedio)

End Sub

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click

TextBox1.Text = "" : Label2.Text = ""

End Sub

End Class

Formulario no. 3

Public Class Form3

Private Sub PictureBox1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles PictureBox1.Click

MsgBox("Mensaje" & vbCrLf & " Hola")

End Sub

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click

TextBox1.Clear() : TextBox2.Clear() : TextBox3.Clear() ListBox1.Items.Clear() : ListBox2.Items.Clear()

End Sub

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

Dim vf As Double, tasa As Double, periodo As Integer Dim x As Integer, vp As Double

vf = Val(TextBox1.Text) : tasa = Val(TextBox2.Text) : periodo = Val(TextBox3.Text)

For x = 0 To periodo vp = vf / (1 + tasa / 100) ^ x

'ListBox1.Visible = True

'ListBox2.Visible = True

ListBox2.Items.Add(vp)

ListBox1.Items.Add(x)

Next x

End Sub

End Class

Formulario no.4

Imports System.Math

Public Class Form4

Private Sub PictureBox1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles PictureBox1.Click

MsgBox("Hola a todos " & vbCrLf & "Mensaje" & vbCrLf & "A todos ")

End Sub

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

Dim num1 As Double, num2 As Double Dim suma As Double, resta As Double, multi As Double, divi As Double

If RadioButton1.Checked = True Then

num1 = Val(TextBox1.Text) : num2 = Val(TextBox2.Text)

suma = num1 + num2 Label3.Text = "Suma " & CStr(suma)

End If

If RadioButton2.Checked = True Then

num1 = Val(TextBox1.Text) : num2 = Val(TextBox2.Text)

resta = num1 - num2 Label3.Text = "Resta " & CStr(resta)

End If

If RadioButton3.Checked = True Then

num1 = Val(TextBox1.Text) : num2 = Val(TextBox2.Text)

multi = num1 * num2 Label3.Text = "Producto " & CStr(multi)

End If

If RadioButton4.Checked = True Then

num1 = Val(TextBox1.Text) num2 = Val(TextBox2.Text)

divi = num1 / num2 Label3.Text = "División " & CStr(divi)

End If

End Sub

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click

TextBox1.Text = "" : TextBox2.Text = "" : Label3.Text = ""

End Sub

End Class

Formulario no. 5

Public Class Form5

Dim num1 As Double, num2 As Double, resultado As Double

Private Sub PictureBox1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles PictureBox1.Click

MsgBox("Hola a todos " & vbCrLf & "A todos " & vbCrLf & "Hola")

End Sub

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

Dim suma As Integer Dim contador As Integer suma = 0 : contador = 0

Do While suma <>

suma += CInt(TextBox1.Text)

contador = contador + 1 Loop

MsgBox("El bucle está corriendo" & CStr(contador) & "veces")

End Sub

Private Sub Form5_FormClosing(ByVal sender As Object, ByVal e As System.Windows.Forms.FormClosingEventArgs) Handles Me.FormClosing

If MessageBox.Show("¿Cerrar la ventana?", _ "Atención", MessageBoxButtons.YesNo, _ MessageBoxIcon.Hand) = DialogResult.No Then e.Cancel = True

End If

End Sub

Private Sub Form5_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load MessageBox.Show("Haz iniciado") End Sub Private Sub Form5_MouseMove(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles Me.MouseMove

Me.Text = "Coordenadas ratón: X:" & e.X & " Y:" & e.Y

End Sub

Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged

If ComboBox1.Text = "SUMA" Then

num1 = Val(InputBox("Número 1", "SUMA", ""))

num2 = Val(InputBox("Número 2", "SUMA", ""))

resultado = num1 + num2 MessageBox.Show(resultado)

End If If ComboBox1.Text = "RESTA" Then

num1 = Val(InputBox("Número 1", "RESTA", ""))

num2 = Val(InputBox("Número 2", "RESTA", ""))

resultado = num1 - num2

MessageBox.Show(resultado)

End If

If ComboBox1.Text = "MULTIPLICACIÓN" Then

num1 = Val(InputBox("Número 1", "MULTIPLICACIÓN", ""))

num2 = Val(InputBox("Número 2", "MULTIPLICACIÓN", ""))

resultado = num1 * num2 MessageBox.Show(resultado)

End If

If ComboBox1.Text = "DIVISIÓN" Then

num1 = Val(InputBox("Número 1", "DIVISIÓN", ""))

num2 = Val(InputBox("Número 2", "DIVISIÓN", ""))

resultado = num1 / num2

MessageBox.Show(resultado)

End If

If ComboBox1.Text = "EXPONENCIACIÓN" Then

num1 = Val(InputBox("Base", "EXPONENCIACIÓN", ""))

num2 = Val(InputBox("Exponente", "EXPONENCIACIÓN", ""))

resultado = num1 ^ num2 MessageBox.Show(resultado)

End If

If ComboBox1.Text = " RADICACIÓN" Then

num1 = Val(InputBox("Raíz del número ", "RADICACIÓN", ""))

resultado = Math.Sqrt(num1) MessageBox.Show(resultado)

End If

End Sub

End Class

Formulario no. 6

Public Class Form6

Dim numero As Integer Dim valorx As Double Dim result As Double Dim i As Integer

Function funcion(ByVal x As Double) As Double

funcion = 10 * x ^ 3 + 4 * x ^ 2 + 12 * x

End Function

Private Sub Form6_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

Me.Text = "Función 10 * x ^ 3 + 4 * x ^ 2 + 12 * x"

Me.Label1.Text = "Número de elementos:"

Me.Label2.Text = "QUITAR"

End Sub

Private Sub Label2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Label2.Click

Me.Close()

End Sub

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click

Call limpiar()

End Sub

Public Sub limpiar()

TextBox1.Text = "" : ListBox1.Items.Clear() : ListBox2.Items.Clear() : ListBox3.Items.Clear()

End Sub

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

i = 0 numero = Val(TextBox1.Text)

For Me.i = 1 To numero

valorx = Val(InputBox("Valor elemento no." & i, "Introduce valor", ""))

result = funcion(valorx)

ListBox1.Items.Add(i)

ListBox2.Items.Add(valorx)

ListBox3.Items.Add(result)

Next

End Sub

End Class

Formulario no. 7

Public Class Form7

Private Sub Form7_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

Me.Text = "Salario en .NET"

End Sub

Private Sub Label3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Label3.Click

Me.Hide()

End Sub

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

Dim hr As Integer Dim salarioNeto As Double Dim extra As Double Dim tasa As Integer

hr = Val(TextBox1.Text)

If hr <= 0 Then

MsgBox("Error las horas deben cer mayores a cero", MsgBoxStyle.Critical, "Aviso del sistema")

End If

'---casillas de verificación checkbox---------------------------------------------------------

If CheckBox1.CheckState = 1 Then

'MsgBox("Francés")

extra = 0.01

End If

If CheckBox2.CheckState = 1 Then

'MsgBox("Alemán")

extra = 0.02

End If

If CheckBox3.CheckState = 1 Then

'MsgBox("Inglés")

extra = 0.03

End If

'---------------------------------------------------------------------------------------------

'---radiobuttons-------------------------------------------------------------------------------

If RadioButton1.Checked = True Then

extra += 0.05

End If

If RadioButton2.Checked = True Then

extra += 0.25

End If '--------------------------------------------------------------------------------------------- '---comboboxs--------------------------------------------------------------------------------

If ComboBox1.Text = "5%" Then

tasa = 5

End If

If ComboBox1.Text = "10%" Then

tasa = 10

End If

If ComboBox1.Text = "25%" Then tasa = 25

End If

If ComboBox1.Text = "50%" Then

tasa = 50

End If

'--------------------------------------------------------------------------------------------

salarioNeto = hr + tasa + extra + 1200

MsgBox(salarioNeto, MsgBoxStyle.Information, "Resultado")

End Sub

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click

TextBox1.Clear()

End Sub

End Class