[RESOLVED][02/03] how to pass variable from one form to another form

[nUflAvOrS]

Hi all,

Now i'm facing a problem when i passing a variable from one form to another form, i can't get the value.

I used the method of property.
vb code
Form A

Private UserID as string
Private Sub New()
   Me.User_ID = textbox1.text
End Sub
Public property User_ID() as string
   Get 
       Return UserID
   End Get
   Set (ByVal Value As String)
       UserID = Value
   End Set
end property

Form B --> Try to get value from Variable form A

    dim frm as new FormA
    textbox1.text = frm.User_ID

[Andy_P]

http://www.vbforums.com/showthread.p...ght=definitive

[nUflAvOrS]

Thx Andy showed me the link.
I faced the problem while passing value from parent to child .

[RaviIntegra]

Assign a variable as public in Form A and then assign some values to that variable and call that variable from Form B.

Example

Public test as string="Testing"
'Write this code in Form A and write the following line in Form B

messagebox.show(FormA.test)

[stanav]

You had it backwards in the constructor. It should be

Private Sub New()
   Me.textbox1.text = UserID
End Sub

And in formA, when you instantiate formB, you should set the User_ID property of formB

'This is done in formA
Dim frmB As New FormB
frmB.User_ID = "whatever id you want to put in here"
frmB.Show()

[nUflAvOrS]

Thx stanax,

I ever tried your method, but when everytime i need passing variables i have to create a lot of property.Furthermore, if i create a property inside a class why i cannot used the class public property to store the value when program is running ?

Stanax i rated you ... thanks a lot

[nUflAvOrS]

My project contains a class store the public variable

In VB 6 i always used

Public Variable as string

to assign a variable to store value along project is running.

In .net i'm still new

I tried create a class but still cannot obtains the value

Class

Public Class VariableStorage
    Private UserID As String
    Public Sub New()
        MyBase.new()
    End Sub
    Public Property User_ID() As String
        Get
            Return UserID
        End Get
        Set(ByVal Value As String)
            UserID = Value
        End Set
    End Property

End Class

 Private Sub cmdLogin_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdLogin.Click
   Dim USerID As New VariableStorage
   USerID.User_ID = Me.txtUserID.Text.ToString
 end sub

Private Sub mdiForm_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
    Dim UserID As New VariableStorage
       
    Me.sbpMdiForm.Panels.Item(0).Text = "User ID:  " & UserID.User_ID
   END SUB

thanks !!!!!

[stanav]

Thx stanax,

I ever tried your method, but when everytime i need passing variables i have to create a lot of property.Furthermore, if i create a property inside a class why i cannot used the class public property to store the value when program is running ?

Stanax i rated you ... thanks a lot

Unless it is absolutely needed, I tend not to use public variables because they're considered as bad programming practice... Why is it bad? If you just google for "why are public variables bad?" and you'll get the image

[nUflAvOrS]

THANKS stanav ,, ;-) i will take ur advise