module

[hitechoutlaw]

i'm doing a website for school on Curency Conversion, i was going to make a program to convert what the person inputs. i was thinking about using a module to store all the conversions so i can just call them from that.

 

i think a module is what i want but i'm new to stuff like that, and if it is a module how do i call functions from it?

 

thx

[Derek Stone]

The use of modules in any object-oriented application is a poor decision. The reason(s) (God forbid there be more than one) why Microsoft included the ability to use modules in .NET blows my mind, and I prefer not to think about it. Instead, look towards using shared (static) members of a class. They're coded like so:

 

Class Dog

   Public Shared Sub Bark()
       'Dog barks
   End Sub 'Bark

End Class 'Dog

You can call the function like so:

Dog.Bark()

It's rather simple, as you can see.

[Robby]

You really should not use modules, you can use Property or Function in a seperate class.

 

You can check MSDN on this or wait a few minutes for someone here to explain.

[hitechoutlaw]

the reason i said modules was because some1 helped me build a program in VB6 so i assumed it would be the same in .net.

 

thank guys i'll check out the MSDN to learn more on the subject.

[hitechoutlaw]

ok i made a class for the labeling of the the labels and when i put in:

 

Label5.text = "sumthang"

 

it says:

 

"Reference to a non-shared member requires an object reference."

 

how do i do this?

[bpayne111]

you need to pass a pointer to that object to your class... or edit the label in the form's code

 

ie

 

public class Fake

 

public sub ChangeLabel(byval myForm as Form)

 

myForm.label1.text = "this"

 

end sub

end class

 

now your label will be accessible in that function

[hitechoutlaw]

When i click button 1 it, it says:

 

An unhandled exception of type 'System.NullReferenceException' occurred in Curency Conversion.exe

 

Additional information: Object reference not set to an instance of an object.

 

 

here is my code:

 

   Class Label
       Public Shared Sub lbl5()
           Dim myForm As Form1
           myForm.Label5.Text = "Blah Blah Blah"
       End Sub
   End Class

   Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
       Label.lbl5()
   End Sub

 

does ne1 know what is wrong?

[hitechoutlaw]

and o yeah, i says its in the line:

 

myForm.Label5.Text = "Blah Blah Blah"

 

maybe that will help more

[jfackler]

I think you have to instantiated your myform

dim myform as new form1

I don't think myform exists

[hitechoutlaw]

i changed it to

 

Dim myform as new form1()

 

now it doesnt do anything, it justs sits there and nothing changes, maybe my code is wrong some where but i've failed to see where. it all looks right to me :(

[jfackler]

Read bpayne111 note above....

[hitechoutlaw]

oops, hehe, i didnt see that post.

 

i added:

 

(byval myForm as Form1)

 

and now i cant call it, i says it requires an object Reference. i dont know what to put in the () while calling it.

 

thanks to all who is helping

[jfackler]

Class Label
       Public Shared Sub lbl5(ByVal myform As Form1)

           myform.Label5.Text = "Blah Blah Blah"
       End Sub
   End Class

   Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
       Dim myf As New Form1()
       Me.Label.lbl5(myf)
       myf.Show()



   End Sub

End Class

this works but I don't know if it's what you want.

Jon

[hitechoutlaw]

o i see it now.

 

does the form have to be reloded to show any chages to labels?

 

thanks again

[jfackler]

Your first iteration actually works also

Class Label
       Public Shared Sub lbl5()
           Dim myForm As New Form1()
           myForm.Label5.Text = "Blah Blah Blah"
           myForm.Show()
       End Sub
   End Class

   Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
       Label.lbl5()
   End Sub

[hitechoutlaw]

if u do "myForm.Show()" it loads another form, then u have two open, how come the .refresh() doesnt work, well i dunno wut is for but it didnt do what i was hoping when i tried it. is there a way to do it with out having to load another form?

[jfackler]

Class Label
       Public Shared Sub lbl5()
           
           Form1.ActiveForm.Controls(1).Text = "Blah Blah Blah"
          
       End Sub
   End Class

   Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
       Label.lbl5()
   End Sub

cut and paste this I think it does what you want.....if the index of your label5 is 1

[hitechoutlaw]

ok the index is 0, is there an easy way to find the index or set it? what is the index really?

 

thanks man u helped alot i might be able to finish it off from here with out problem but .NET is sooo differnt from 6 so i might be back in the near future.

 

thx again

[jfackler]

   Class Label
       Public Shared Sub lbl5()

           Dim connum As Integer = 0
           For connum = 0 To Form1.ActiveForm.Controls.Count() - 1
               If Form1.ActiveForm.Controls(connum).Name() = "Label5" Then
                   Form1.ActiveForm.Controls(connum).Text = "blah blah blah"
               End If
           Next
          
       End Sub
   End Class

   Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
       Label.lbl5()
   End Sub

ok I think this will do the trick no matter what the index of your label5 is.

Jon

[hitechoutlaw]

thx alot

[jfackler]

The index of a control is assigned as you add the control to the form....last control added has an index of 0, first control added has greatest index.

[hitechoutlaw]

oic kool thanks

[hitechoutlaw]

ok i've got all the labeling written and i cant find out how to add items to a combo box.

 

nething will help, thx

 

and o ya, ".Items.Add" wont work

[jfackler]

ComboBox1.Items.Add("hello")

[hitechoutlaw]

like i said, that wont work, thanks for ur reply though