تمارين محلولة

Projects vb.net


• 1 – اظهار رسالة ترحيب علي form
Public Class Form1

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Me.Label1.Text = "welcome here"
End Sub
End Class







• 2- اظهار رسالة ترحيب في صندوق رسالة
Public Class Form1

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
MsgBox("welcome here")
End Sub
End Class









• 3 - برنامج يظهر الصورة في أماكن عشوائية

Public Class Form1
Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
Dim x, y, h, w As Integer
x = Me.PictureBox1.Left
y = Me.PictureBox1.Top
h = Me.PictureBox1.Height
w = Me.PictureBox1.Width
y = 200 * Rnd()
x = 200 * Rnd()
Me.PictureBox1.SetBounds(x, y, w, h)
End Sub
End Class







• 4 – اظهار الوقت والتاريخ

Public Class Form1

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Me.Label1.Text = Date.Now
End Sub
End Class










• 5 – اظهار واخفاء صورة

Public Class Form2
Private Sub RadioButton2_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles RadioButton2.CheckedChanged
Me.PictureBox1.Visible = True
End Sub

Private Sub RadioButton1_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles RadioButton1.CheckedChanged
Me.PictureBox1.Visible = False
End Sub

End Class







• -6 -برنامج يوضح الاعلان عن المتغيرات الرقمية واستخدام أمر التخصيص وتتبع قيمة المتغيرات واجراء العمليات الحسابية
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim X As Short
Dim Y As Short
Dim Z As Short
X = 10
X = 2 * X + 1
Y = X - 8
Z = Y / 4
Z = Z + 4
Me.Label1.Text = X Me.Label2.Text = Y Me.Label3.Text = Z
End Sub





• 7- برنامج يوضح الاعلان عن المتغيرات الحرفية واستخدام أمر التخصيص والعمليات التي تجري عليها وعرض كلمة ترحيب مع عرض الاسم الذي تم ادخاله في سطر جديد

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim fristname As String
Dim lastname As String
Dim fullname As String
fristname = (Me.TextBox1.Text)
lastname = (Me.TextBox2.Text)
fullname = fristname & " " & lastname
' Me.Label1.Text = "hello" & vbCrLf & fullname
MsgBox("hello" & vbCrLf & fullname)
End Sub
End Class













Global variables
• -8 الالة الحاسبة باستخدام المتغيرات الشاملة















Public Class Form1
Dim a, b, add, subtract, mult, div As Decimal

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
a = Decimal.Parse(Me.TextBox1.Text)
b = Decimal.Parse(Me.TextBox2.Text)
add = a + b
Me.Label3.Text = add.ToString()
End Sub
Private Sub Button6_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button6.Click
End
End Sub
Private Sub Button5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button5.Click
TextBox1.Text = ""
TextBox2.Text = ""
Label3.Text = ""
End Sub
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
subtract = a - b
Me.Label3.Text = subtract.ToString()
End Sub

Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
mult = a * b
Me.Label3.Text = mult.ToString()
End Sub

Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click
div = a / b
Me.Label3.Text = div.ToString()
End Sub

9 – برنامج auto test يستخدم لشرح كيفية استدعاء نموذج آخر

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Form2.Show()
End Sub



Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim b As Integer
If Me.RadioButton2.Checked Then
b = 20
Me.Label6.Text = b.ToString
End If
If Me.RadioButton4.Checked Then
b = b + 20
Me.Label6.Text = b.ToString
End If
If Me.RadioButton5.Checked Then
b = b + 20
Me.Label6.Text = b.ToString
End If
If Me.RadioButton8.Checked Then
b = b + 20
Me.Label6.Text = b.ToString
End If
If Me.RadioButton9.Checked Then
b = b + 20
Me.Label6.Text = b.ToString
End If
Dim score As Decimal
' score = Decimal.Parse(Me.TextBox1.Text)
score = b.ToString
If score >= 90 Then
Me.Label7.Text = "ممتاز"
ElseIf score >= 75 Then
Me.Label7.Text = "جيد جدا"
ElseIf score >= 60 Then
Me.Label7.Text = "جيد "
ElseIf score >= 50 Then
Me.Label7.Text = "مقبول "
Else
Me.Label7.Text = "راسب "
End If
End Sub

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
Label6.Text = ""
' TextBox1.Text = ""
Label7.Text = ""
Me.RadioButton1.Checked = False
Me.RadioButton2.Checked = False
Me.RadioButton3.Checked = False
Me.RadioButton4.Checked = False
Me.RadioButton5.Checked = False
Me.RadioButton6.Checked = False
Me.RadioButton7.Checked = False
Me.RadioButton8.Checked = False
Me.RadioButton9.Checked = False
Me.RadioButton10.Checked = False

End Sub
End Class