How to transfer the text from dynamically generated user control to a textbox

Question

I have a windows form in which I have a button1 and when that is clicked a UserControl that is added dynamically to the code is this:

Answer 1

I would do this with events.

Create a class that inherits from EventArgs: (I prefer VB, you can traslate)

Public Class ControlEventArgs
  Inherits EventArgs

  Public Property Value1 As String = String.Empty
  Public Property Value2 As String = String.Empty
  Public Property Value3 As String = String.Empty
  Public Property Value4 As String = String.Empty

End Class

Then in your Control add the event:

Public Event ValueSubmittal As EventHandler(Of ControlEventArgs)

In your Button2_Click handler:

RaiseEvent ValueSubmittal(me, new ControlEventArgs With {.Value1=comboBox1.Text, .Value2 = comboBox2.Text, .Value3 = textBox1.Text, .Value4 = textBox2.Text}

And in your form where you dynamically create the controls you need to hook up the event handler:

AddHandler myNewControl.ValueSubmittal, AddressOf ValueSubmittalHandler

And the ValueSubmittalHandler:

Private Sub ValueSubmittalHandler(sender as Object, e As ControlEventArgs)
  formControl1.Text = e.Value1
  formControl2.Text = e.Value2
  '  etc...
End Sub

Answer 2

You should add to your class UserControl1 (great name btw ;-) ) something like this for every string you want to access from another object, in this case the string of textBox1:

public String FirstTextBoxText 
{
   get { return this.textBox1.Text; }
}

Then you can say in your Form class:

 if (ctrl is UserControl)
 {
     UserControl1 myCrl = ctrl as UserControl1;
     // ...
     oldtextbox1.Text = still-textbox3.text + "," + myCrl.FirstTextBoxText;
 }

It's still horrible code, but it will work.

Answer 3

You can create a class level variable:

    private UserControl1 us1;
    private UserControl1 us2;

    private void button1_Click(object sender, EventArgs e)
    {
        int v;
        v = c++;
        panel1.VerticalScroll.Value = VerticalScroll.Minimum;

        if(us == null) 
        {
            //this is the first time the control is created
            us1 = new UserControl1();
            us1.Name = "us" + v;
            us1.Location = new Point(50, 5 + (30 * v));
            us1.Tag = btn;        
            panel1.Controls.Add(us1);
        }
        else if(us2 ==null)
        {
            us2 = new UserControl1();
            //whatever code you want to execute to change second one
            //you can access first control as us1.xxx
            panel1.Controls.Add(us2);

        }
        else
        {
           //3rd 4th etc...
        }


     }