Question

I have a windows application which has 3 forms : Form1,2,3. I want to send text of a textbox from form2 to form1 and then that same text from form1 to form3, that is,

Text from FORM2–>FORM1–>FORM3

• Form 1, has 2 buttons , openform2, openform3.
• Form2 has a textbox form2_textbox, & a button send_to_form1_button
• Form3 has a textbox received_from_form1_textbox

Now,

• on clicking button openform2 on form1, Form2 opens,
• a string is entered in textbox form2_textbox of Form2,
• when button form2_button of this form is clicked, then I want Form1 to receive this string value & stores it in a string receivefromform2,
• and then displays this string value on to form3_textbox of Form3.

public partial class Form1 : Form
{
    string receivefromForm2a;

    public Form1()
    { InitializeComponent(); }

    public void Method_Receive_From_Form2(string receivefromForm2)
    {
        receivefromForm2a = receivefromForm2;
        Form3 f3 = new Form3(receivefromForm2a);
    }

    private void openform3_Click(object sender, EventArgs e)
        {
            Form3 f3 = new Form3();**----this line gives error:No overload for method Form3 takes 0 arguments**

            f3.Show();
        }

    private void OPENFORM2_Click(object sender, EventArgs e)
    {
        Form2 f2 = new Form2();
        f2.Show();
    }
}

---

public partial class Form2 : Form
{
    public Form2()
    {
        InitializeComponent();
        string loginname = form2_textbox.Text;
    }

    //SENDING VALUE OF TEXTBOX ON FORM2 TO FORM1.

    private void send_to_form1_button_Click(object sender, EventArgs e)
    {
        Form1 f1 = new Form1();
        f1.Method_Receive_From_Form2(form2_textbox.Text);
    }
}

---

public partial class Form3 : Form
{
    public Form3(string receive_from_Form1)
    {
        InitializeComponent();
        received_from_form1_textbox.Text = receive_from_Form1;
    }
}

This error occurs because in form2 I have given argument for form1 during object creation.
So what should I do? Is there any other way to do this or how do I remove this error?

When I include the f3.Show() in the method Method_Receive_From_Form2 then there is no error. but this makes the form3 load automatically without any button click. But I want form3 to open by clicking the button on form1. And then the value to be shown in the textbox.

Answer 1

I would recommend a change from using constructors to using properties. This will keep things properly ‘contained’ and it’s pretty simple.

EX:

public partial class Form3 : Form
{
   public String form1Text {get; set;}

   public Form3()
   {
       InitializeComponent();
   }
}

---

public partial class Form2 : Form
{
   public Form2()
   {
       InitializeComponent();
       string loginname = form2_textbox.Text;
   }

   public String form2Text {get; set;}

   private void send_to_form1_button_Click(object sender, EventArgs e)
   {

       form2Text = form2_textbox.Text;
       this.DialogResult = DialogResult.Ok;
       this.Close();
   }
}

Then in form 1:

public partial class Form1 : Form
{
   string receivefromForm2a;

   public Form1()
   { InitializeComponent(); }       

    private void openform3_Click(object sender, EventArgs e)
    {
        Form3 f3 = new Form3();
        f3.form1Text = receivefromForm2a;
        f3.Show();
    }

private void OPENFORM2_Click(object sender, EventArgs e)
{
    Form2 f2 = new Form2();
    if(f2.ShowDialog() == DialogResult.Ok)
    {
      receivefromForm2a = f2.form2Text; //New Property on Form2.
    }
}
}