How to Pass Value from One Form to another Form

Submitted by admin on Monday, October 12, 2009 - 20:48.

I think it’s time again to teach you on the features that can be found on my program like Hotel Reservation System (VB.NET).

A while ago I received a comment on how to pass value from one form to another form. Although I have already done this in almost all of my program but I know that some of you miss the opportunity to analyze it due to the complexity of the program.

Without further ado, let us take the example from Hotel Reservation System (VB.NET).

In frmRoomWindow form you can see the following code:

        With frmCheckIn
            .State = modGlobal.FormState.adStateEditMode 'Line two
            .RoomNumber = intRoomNumber ' Line three
 
            .ShowDialog()
 
            Call FillList()
        End With

The line two and three will pass a value to State and RoomNumber variable. In order to pass this value the receiving form which is frmCheckIn needs to define these variables first, as shown below:

Friend Class frmCheckIn
    Inherits System.Windows.Forms.Form
 
    Dim daTransactions As New OleDbDataAdapter()
    Dim dsTransactions As New DataSet()
    Dim cnHotel As OleDbConnection
 
    Public RoomNumber As Integer 'Line eight
    Public State As modGlobal.FormState 'Line nine
    Public FolioNumber As String
    Public AmountPaid As Decimal
    Public OtherCharges As Decimal
    Public blnChangeRoom As Boolean
 
    Private IsInitializing As Boolean

As you can see in the line eight and nine RoomNumber and State is define here as public variable. Declaring this variable as public is very important to receive a value from other form, or else it cannot receive any value.

As it is already been defined at the module level of the form then you can call it anywhere in your code like in the Form_Load event. Example:

Private Sub frmCheckIn_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        If State = modGlobal.FormState.adStateAddMode Then
                txtRoomNumber.Text = CStr(RoomNumber)
                dtpDateIn.Value = Today
                dtpDateOut.Value = DateTime.Now.AddDays(1)
End Sub

I hope this helps.

Comments

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Compliments

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re: Public Variables

For easy coding, it is ok to use public variables. But if we are concerned about proper program design, we must remember that in .NET, a form is treated as a class. Therefore, having public variables breaks the encapsulation principle of OOP. To solve this issue, we may implement a property to get or set value of a variable. for Example:

 public partial class CheckinForm: Form
 {
        int roomNumber;
        string folioNumber;
 
        public frmSplash()
        {
            InitializeComponent();
        }
 
        public int RoomNumber
        {
            get { return roomNumber;}
            set { roomNumbr = value;}
        }
 
        public string FolioNumber
        {
            get { return folioNumber; }
            set { folioNumber = value; }
        }
}

So if you are to pass a value from a form to another form, you will use something like this:

CheckInForm checkInForm = new CheckInForm();
checkInForm.RoomNumber = <whatever value>;
checkInForm.FolioNumber = <whatever value>;

help mehhh

passing a value form one form to another form1 using simple codes. .

q

how to embed a access database file on a visual basic 6.0 program?

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