Passing the values of my TextBox from Form1 to form2 by clicking button

Question

I want to pass values of my TextBox from Form1 to Form2.

And this message appear.

"Form that is not a top-level form cannot be displayed as a modal dialog box. Remove the form from any parent form before calling showDialog."

Here is my Code of Form1 :

private void btnAddReceipt_Click(object sender, EventArgs e)
    {

        this.Hide();
        using (var Ticket = new frmCustomerTicket())
        {
            Ticket.CustomerID = txtCustNo.Text;
            ShowDialog();

        }

    }

Here is My Code in Form2

    public string CustomerID { get; set; }


    private void frmCustomerTicket_Load(object sender, EventArgs e)
    {

        txtCustID.Text = CustomerID;        

    }

Answer 1

Try this:

private void btnAddReceipt_Click(object sender, EventArgs e)
{



    this.Hide();
    var Ticket = new frmCustomerTicket();
        Ticket.CustomerID = txtCustNo.Text;
        Ticket.Show();



}

Upate Remove the using block it will cause the Form2 element to dispose as soon as it falls out of scope.

Answer 2

Why don't you do it on the constructor? I mean you can have this on ur form 2:

public partial class MyForm: Form
{
   string myvar = string.Empty;
   public MyForm(string a)
   {
      InitializeComponent();
      this.myvar = a;
   }
}

and in your form1 you could have:

using (var Ticket = new frmCustomerTicket(txtCustNo.Text))
    {
        Ticket.ShowDialog();
    }

Answer 3

oh the click event of the button of first form do:

        Form2 F2 = new F2(this);
        F2.Show();
        this.Hide();

then in second form initialize the first form

    FormFirst F1 = new FormFirst();

    public From2(FormFirst form1)
    {
        InitializeComponent();
        F1 = form1;
    }
     textboxt2.text = F1.textbox.Text;

Don't forget to make the modifier of the textbox of first form to public

Answer 4

I think your problem is not about forms. 表单 。 I think it's about MDI Parent & Child forms. By definition, an MDI child form is not modal. Take a look at these links:

How can i make an MDI form inactive when child form is active
ShowDialog with MdiParent Issue
Call an Childform in MDIParent Form using ShowDialog()