Passing a value from form to form

Passing a value from form to form

• Dave Foderick

  Just what I need. Thanks for the help.
  
  

• Jared B

  Heres some code passing a couple of values as an array list from form1 to form2.

  Public Class Form1
  Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
  Dim y As New ArrayList

  y.Add("xxxx")
  y.Add("zzzzz")

  Dim frm As New Form2
  frm.foo = y
  frm.Show()

  End Sub
  End Class

  Public Class Form2
  Dim x As ArrayList

  Public Property foo() As ArrayList
  Get
  Return x
  End Get
  Set(ByVal value As ArrayList)
  x = value
  End Set
  End Property

  Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
  MsgBox(x.Count)
  End Sub
  End Class

  
  

• Christian Kleinerman - MS

  Hmm...tell a little more about your problem. Do you close the first form (the one that contains the information) or do you have two forms and just want to share information between them

  
  

• Slaru

  If you use the properties to pass the variables around or use an overloaded constructor to initialize the object upon creation they are both valid approaches.

  You may overload the Constructor and use this to set the properties. This provides you with a simple method to create and initialize on the same line by using the overloaded constructor.

  A new feature coming in next version of VB (codename Orcas) is called Aggregate Initializers and will enable you to create objects and set properties on same line.

  But either method is valid.

  
  

• DanWoerner

  I have a simple read-only program in VB 2005 that will be retrieving info from several different SQL Server views based on a single case number.  It will have 3 to 4 forms and each will be closing when the next or previous one is opened.

  The way I am setting it up now, each form will get info form its own view.  Each view pulls from a different table or tables with the case number being the common field in all of the tables.  I want to pass the case number from form to form.

  
  
  

• zbc

  Sure you could do it as a collection,array, List or individual properties - it really depends upon the individual scenario.

  
  

• Designs

  Thanks for all of your help, spotty. I can finally make some progress on my app!

  
  
  

• mfarace

  How would I pass several values as a collection/array
  
  

• RonO2006

  Exactly what i would have suggested you. I don't think there is a much better way... :)

  If you have lot of values to pass, think about passing one big collection / array instead of creating a lot of different properties...but i think you would have done.

  
  

• Jonleeofbj

  Create a Property on the second form and then when you create an instance of the second form from the first form - set this property.   In this case it takes a value from the Textbox1 text property and passes it to the instance of form2 when it creates it and uses this to set the caption.

  Public Class Form1
      Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
          Dim Instanceform2 As New Form2
          Instanceform2.XValue = textbox1.text
          Instanceform2.Show()
      End Sub
  End Class

  
  Public Class Form2
      Private x As Integer

  
      Public Property XValue() As Integer
          Get
              Return x
          End Get
          Set(ByVal value As Integer)
              x = value
          End Set
      End Property

      Private Sub Form2_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Me.Text = x.ToString
      End Sub

  
  End Class

   

  So in each of your forms you will have a CaseNo property which you set when you create an instance of the form.   The forms can then have pretty self contained functionality.

   

  
   

  
  

• Vladimir Nikitin

  I need to pass 4 values. I tried passing an array where the variables were arrays but I couldn't get the syntax right. In this scenario, what would be the best way and what is the correct syntax

  Thanks.

  
  
  

• Dhivager Rathakrishnan

  Wouldn't the OO way be to create a new class object that has getters/setters for the variables stored within it and pass it around from form to form
  
  
  

• slippery

  Another manner of passing values from Form1 to Form2 is to Overload the New() Constructor of Form2. This Creates Form2 that accepts/requires Parameters from Form1.

  In Form2 you would place similar code in the New() Constructor in the "Windows Form Designer generated code".

  Form2:

  Public Sub New(ByVal frmCurrentCallingForm As Form, ByVal strCurrentSQLStatement As String, ByVal strCurrentTableName As String)

  MyBase.New()

  'This call is required by the Windows Form Designer.

  InitializeComponent()

  'Add any initialization after the InitializeComponent() call

  frmCallingForm = frmCurrentCallingForm

  strSQLStatement = strCurrentSQLStatement

  strTableName = strCurrentTableName

  End Sub

  In Form1 you would call Form2 with the following code:

  'Pass the Required Parameters to Form2.

  Dim frmNewForm2 As New frmForm2(Me, strSQLProcedure, strTableName)

  'Show Form2.

  frmNewForm2.Show

  
  
• Passing a value from form to form