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VB.NET Discussion Thread
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Jun 11th, 2008

byref in vb.net

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hey guys.
here is a scenario:

i have a form named frm1 and a variable in it

VB.NET Syntax (Toggle Plain Text)
 private x as integer = 0
 private x as integer = 0

and another form called frm2 that needs to be able to make a local copy of "x" from frm1 and any changes made to "x" on frm2 needs to be changed on frm1.

so in frm2 i do

VB.NET Syntax (Toggle Plain Text)
 
private number as integer 
 
Public Sub New(ByRef x as integer)
 
number = x
 
end sub
private number as integer 

Public Sub New(ByRef x as integer)

number = x

end sub

and from frm1 i create frm2 as follows:

VB.NET Syntax (Toggle Plain Text)
 
public sub createfrm()
 
dim frm as new frm2(x)
frm.showdialogue()
 
end sub
public sub createfrm()

dim frm as new frm2(x)
frm.showdialogue()

end sub

and now any changes made to 'number' inside frm2 should change 'x' in frm1 shouldnt it? this does work if you're using a textbox object since the project im working in does exactly that. but when i try and do it for a variable like single/string/integer it doesnt work. it changes the local variable on frm2 but not the variable on frm1.

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dan_e6

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Light Poster

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26 posts
since Apr 2008

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Jun 12th, 2008

Re: byref in vb.net

Hi,
I think Single, Integer, Double Char all are ValueType, So It is not working. Also you can override the ShowDialog() and pass your value

For Example In Form2

VB.NET Syntax (Toggle Plain Text)
    Public Shadows Sub ShowDialog(ByRef x As Integer)
        MyBase.ShowDialog()
        x = 566
    End Sub
    Public Shadows Sub ShowDialog(ByRef x As Integer)
        MyBase.ShowDialog()
        x = 566
    End Sub

To Show Form2 In Form1
Declare
Private Number as Integer

VB.NET Syntax (Toggle Plain Text)
   Dim NewForm As New Form2
   MessageBox.Show(Number)
   NewForm.ShowDialog(Number)
   MessageBox.Show(Number)
   Dim NewForm As New Form2
   MessageBox.Show(Number)
   NewForm.ShowDialog(Number)
   MessageBox.Show(Number)

I am using MessageBox to Show before and After calling the ShowDialog

selvaganapathy

Reputation Points: 44

Solved Threads: 101

Posting Pro

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547 posts
since Feb 2008

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Jun 12th, 2008

Re: byref in vb.net

Declare x as Shared instead of Private

seoprofessional

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18 posts
since May 2008

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Jun 12th, 2008

Re: byref in vb.net

Click to Expand / Collapse Quote originally posted by seoprofessional ...

Declare x as Shared instead of Private

agree

Jx_Man

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Posting Sensei

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since Nov 2007

This thread is more than three months old

No one has posted to this discussion for at least three months. Please let old threads die and do not reply to them unless you feel you have something new and valuable to contribute that absolutely must be added to make the discussion complete. Otherwise, please start a new thread in this forum instead.

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