Passing Values between forms

How to Pass Data Between Forms

In C# and vb.net, there are many situations the new programmers face the same problem about how to pass data and values from one form to another. We can pass values from one form to another in a number of ways. Here you can see one of the easiest method to pass values from one form to another.

In order to communicate between the forms, we are using the Forms constructor to send these values. Constructors performs initialize the data members of the new object and it has the same name of the class. Here we send the values as arguments of the constructor.

public Form2(string title,string txt)
{
    InitializeComponent();
    this.Text = title;
    label1.Text = txt;
}

Public Sub New(ByVal sTitle As String, ByVal sText As String)
    InitializeComponent()
    Me.Text = sTitle
    Me.Label1.Text = sText
End Sub

InitializeComponent

In the above method you can see InitializeComponent() method. This method is automatically created and managed by Windows Forms designer and it defines everything you see on the form. It is better you don't try to modify the InitializeComponent method.

Open a new project and drag two text boxes and a button in the Form1.

Add another form (Form2) in the project and add Label control on it

And we are passing these two textbox values from Form1 to Form2

Here, call the constructor of Form2 and pass these values and set these values in form2

using System;
using System.Drawing;
using System.Windows.Forms;
namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void button1_Click(object sender, EventArgs e)
        {
            string nTitle = textBox1.Text;
            string nText = textBox2.Text ;
            Form2 frm = new Form2(nTitle, nText);
            frm.Show();
        }
    }
}

using System;
using System.Drawing;
using System.Windows.Forms;
namespace WindowsFormsApplication1
{
    public partial class Form2 : Form
    {
        public Form2()
        {
        }
        public Form2(string title,string txt)
        {
            InitializeComponent();
            this.Text = title;
            label1.Text = txt;
        }
    }
}

Public Class Form1
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim sTitle As String
        Dim sText As String
        sTitle = TextBox1.Text
        sText = TextBox2.Text
        Dim frm As New Form2(sTitle, sText)
        frm.Show()
    End Sub
End Class

Public Class Form2
    Public Sub New(ByVal sTitle As String, ByVal sText As String)
        InitializeComponent()
        Me.Text = sTitle
        Me.Label1.Text = sText
    End Sub
End Class

Windows Forms

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