Howto: Return data from one form to another

Question

Hi!

I want to return data to calling point of  the form, but i can't return data when the called form closes. Please tell me how can i return data from one from to another.


Shani!

Answer 1

Hi,

just use properties to do so. and before closeing save the data you want in those properties.
in the closing event of form 2 it coul look like this.

form1.Name = "Shani";

Answer 2

also you can make a function in some form to pass parameters to other form

class form1
dim f2 as new form2
f2.getDataFromOtherForm(20)
f2.show
end class

class form2
dim val as int16
public sub getDataFromOtherForm(i as int16)
   val=i
end sub
end class

I hope this helps

Answer 3

A simple scenario
Form1 has a button which when you click on displays form2 which has a simple textbox and two buttons.  One button on form2 dialog has a dialog result of OK and the other of cancel.
If OK button is pressed then it sets the property (TextboxText) on form2 and closes returning a dialog result of OK.  I button2 is click it closes the form and returns a dialog result of Cancel.

When the Form2 is closed and the focus returns to the caller procedure in form1 (Button1_Click).   The Caller procedure looks to see that the OK button was pressed by examining the dialogresult property and if it is set to OK, retrieves the property from form2 reference.

Public Class Form1

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim oForm2 As New Form2

        oForm2.ShowDialog()
        If oForm2.DialogResult = Windows.Forms.DialogResult.OK Then
            Label1.Text = oForm2.TextboxText
        End If

    End Sub
End Class

 

Public Class Form2
    Private strText As String

    Public Property TextboxText() As String
        Get
            Return strText
        End Get
        Set(ByVal value As String)
            strText = value
        End Set
    End Property
    Private Sub Form2_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Me.strText = TextBox1.Text
        Me.Close()
    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        Me.Close()
    End Sub
End Class

Answer 4

Staring from form1

when calling form2 you do the following

dim fv as new form2
fv.owner = me
fv.show


you show also add the following sub to form1

Public Sub Settxtbox1(ByVal NewText As String)

txtbox1.Text = NewText

End Sub

This Sub will write the returned value to the txtbox desired


now in form2 when clicking button1 for example to return the contents of a textbox2 to txtbox1 in form1, you add the followng code to the button1 click event

Dim fv As form1= DirectCast(Me.Owner, form1)

fv.txtbox1(txtbox2.Text)
me.dispose


hope it helps

Answer 5

Hello Shani,


This help topic shows how to pass data between forms:




Walkthrough: Passing Data between Windows Forms
http://msdn2.microsoft.com/library/ms171925(en-us,vs.80).aspx


hope that helps,

Answer 6

Hi Spotty-
I tried your example and it worked great.  When I tried to adjust it to my situation, I couldn't get it to work.  Obviously, I'm new to this. 

Here's my problem:

I have a checkedListBox with seven items in form2 and want any checked items to show up on a label in form1 when OK is pressed.

Could you please help?
Thanks in advance.