I really really appreciate your concern And, in fact, I'm not that beginner as you think (and as it seems!) ;P and I'm sorry if I asked some beginner questions. Actually, I'm a fan of reading books myself and I'm really used to finding my answers in MSDN and Google, but for this particular question, which has been on my mind for a long time, I didn't know what to exactly search in MSDN or Google, so I tried it here and honestly, I received some very very good answers that I will try to consider surely. Thank you again for your detailed and good answer and for guidance.

Thank you soooo much for your detailed answer, but some questions: Can you please tell me: 1. Why do you find the PictureBox control a useless one? 2. Why did you say that we shouldn't call the CreateGraphics method? 3. What exactly does the Panel.Invalidate() method do and how it can be used here? 4. Why did you say that either create the pen, font, etc. object as class members or create them inside the Paint event handler and call the Dispose method? Why is the Dispose method necessary here and what's the difference between these two methods you mentioned. Thank you in advance ...

Hi everybody, When we use the Graphics object to draw, for example, on a Form, every time, something covers the entire or just a part of the Form (for example, another window) or when the Form is minimized and them maximized for example, all the drawn graphics are lost (or the part present on the covered part of the Form). I wanted to know if there's anyway to retain these graphics in these cases? I don't (and can't) use the Paint method because I'm considering a case where the graphics are drawn using different method and not a single method to be called in the Paint event.

Thanks, I will try that and let you know.

Don't mind please. It's OK. Anyway thank you very very much for your concern. I will surely check the controls you mentioned. Thank you again.

SizeMode is set to Normal, but I tried with AutoSize but it didn't make any difference.

Yes, you are right; if you set the BackgroundColor and make the Form smaller, you notice no difference because there is only one solid color, BUT imagine a situation where you have a picture or something being displayed in the picture box, if you make the Form smaller and the picture box isn't resized accordingly, some parts of the image would not be visible.

Thank you for your reply: Firstly, the picture box's SizeMode property determines how the size changes according to the size of the picture being shown in the picture box. Secondly, I want to achieve a condition in which resizing the Form ALWAYS causes the picture box's size to change even when both Width and Height properties of the form are decreasing; and in fact, as soon as every one of them begins to increase, the picture box's size is also changed.

Hi everybody, I have an issue with Windows Forms: I created a Windows Form and docked a picture box to fill the entire form, but the problem I have is that the picture box's size change only when either "Width" and "Height" properties of the Form (or both of them) are increasing and in fact, if I resize the form so that it becomes smaller (both in Width and Height) the picture box's size wouldn't change. To test this, I tried to update the Text property of the form in the Form's Paint event to reflect the picture box's Size property and when I'm making the Form smaller, neither Width nor the Height of the picture box is changing, any ideas?

Hello to everyone I receive the following error message when trying to do some simple remoting tasks on my computer. Can anybody tell the meaning of this message and, if any, suggest a solution please? Unhandled Exception: System.Security.SecurityException: Type System.DelegateSerializationHolder and the types derived from it (such as System.DelegateSerializationHolder) are not permitted to be deserialized at this security level. Pleeeease ... don't tell me to search Google (as someone did before) because I have already done so, but it didn't do any better I also tried typeFilterLevel="Full" ... but, no difference ... Thank you.

Hello to everyone I receive the following error message when trying to do some simple remoting tasks on my computer. Can anybody tell the meaning of this message and, if any, suggest a solution please? Unhandled Exception: System.Security.SecurityException: Type System.DelegateSerializationHolder and the types derived from it (such as System.DelegateSerializationHolder) are not permitted to be deserialized at this security level. Thank you.

:doh: Hi to all, PLEASE PLEASE PLEASE HELP ME, SORRY IF MY MESSAGE IS SO LONG, BUT I COULDN'T FIND A WAY TO AT LEAST UPLOAD MY CODE FILES SO I HAD TO INSERT ALL THE CODE HERE, BUT PLEASE HELP, I'M REALLYYYYYYYYY STOCKED AND I WILL BE VERY VERY VERYYYYYYYY THANKFUL IF SOMEONE HELPS ME ............ :( :( :( :( :( :( :( :( I am reading the Microsoft's book for exam 70-310 & 70-320 and I have a problem in Chapter 4's lab which I didn't manage to solve ... please help me ... It's a simple chat application using .NET remoting: We have a ChatCoordinator class and a SubmitEventArgs class (saved in a file named: CChatCoordinator.vb) with the following code: ---------------------------------------------------------------------

Imports System
Imports System.Runtime.Remoting
Imports System.Collections

Serializable()> _
Public Class SubmitEventArgs
Inherits EventArgs

Private message As String = Nothing
Private userName As String = Nothing

Public Sub New(ByVal contribution As String, \_
    ByVal contributor As String)
    Me.message = contribution
    Me.userName = contributor
End Sub ' New

Public ReadOnly Property Contribution() As String
    Get
        Return message
    End Get
End Property

Public ReadOnly Property Contributor() As String
    Get
        Return userName
    End Get
End Property

End Class ' SubmitEventArgs

Public Delegate Sub SubmissionEventHandler(ByVal sender As Object, _
ByVal submitArgs As SubmitEventArgs)

Public Class ChatCoordinator
Inherits MarshalByRefObject
Public Sub New()
Console.WriteLine("ChatCoordinator created. Instance: " & _
Me.GetHashCode().ToString())
End Sub ' New

Public Overrides Function InitializeLifetimeService() As Object
    Return Nothing
End Function ' InitializeLifetimeService

Public Event Submission As SubmissionEventHandler

Public Sub Submit(ByVal contribution As String, \_
    ByVal contributor As String)
    Console.WriteLine("{0} says: {1}.", \_
        contributor, contribution)
    Dim e As New SubmitEventArgs(contribution, contributor)
    Console.WriteLine("Broadcasting...")
    RaiseEvent Submission(Me, e)
End Sub ' Submit

End Class ' ChatCoordinator

------------------------------------------------------------------- We have a Server class (in a file named: CServer.vb<