How do I pass data from child of child form to parent form in C#?

naouf10

I am new to c#. I have the following in my project in windows forms: Form1 with button and DataGridView. Form2 with button. Form3 with button and 3 textBoxes. In form1, I click buttonOpenForm2 form2 pops up. Then in form2 I click buttonOpenForm3 form3 pops up which has 3 text boxes and button. Now the 3 forms are open. now in form3, I enter values in textBox1, textBox2 and textBox3 and when click buttonAddRow ( from form3) I want these values to be inserted into the DataGRidView in Form1. My question is: How can I add a row into DataGridView in Form1 ( parent) from form3 (child of child form) WITHOUT closing form2 and form3? I mean I want to pass the data while form2 and form3 are still open. Please help me. Thank you

Form1:

public partial class Form1 : Form
{

public Form1()
{
    InitializeComponent();

}

private void buttonOpenForm2 \_Click(object sender, EventArgs e)
{
    Form2 frm2 = new Form2();
    frm2.Show();
}

}

Form2:

public partial class Form2 : Form
{
public Form2()
{
InitializeComponent();
}

private void buttonOpenForm3 \_Click(object sender, EventArgs e)
{
    Form3 frm3 = new Form3();
    frm3.Show();
}

}

Form3:

public partial class Form3 : Form
{
public Form3()
{
InitializeComponent();
}

private void buttonAddRow \_Click(object sender, EventArgs e)
{
    //What to write here to insert the 3 textboxes values into DataGridView?

}

}

OriginalGriff

Use events and properties: Form3 signals to it's "parent" Form2, which gathers the data and signals an event to it's parent, Form1. Sound complex, but it's really simple! See here: Transferring information between two forms, Part 2: Child to Parent[^]

Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...

BillWoodruff

What was wrong with the answer you got on November 6th. when you asked the same question: [^] ? Why use three Forms when you can use one Form and UserControls ?

«I want to stay as close to the edge as I can without going over. Out on the edge you see all kinds of things you can't see from the center» Kurt Vonnegut.

naouf10

Hi, thank you for the help, I will have to study the properties and events then i will test the code written in the answer. thank you

naouf10

Hi . nothing wrong but i am new to c# and i have to study the events and property then i will test the code. yes i will try to use form and user control instead, thank you

OriginalGriff

You're welcome!

Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...

susad

Build some business logic, i.e. class(es) for storing the text entered form3 and pass it/them to form1 in buttonAddRow_Click or make something like this

public struct EnteredText
{
public string t1, t2, t3;
};

public partial class Form3 : Form
{
public delegate void ButtonClick(EnteredText data);
public event ButtonClick OnClick;
...
private void buttonAddRow _Click(object sender, EventArgs e)
{
EnteredText args;
args.t1 = textbox1.Text; args.t2 = ...
if (OnClick != null)
OnClick(args);
}
}

Means you copy the text from the boxes into the struct and fire the event OnClick. Somewhere in Form2 you should do something like this:

Form3 f3 = new Form3();
f3.OnClick += f3_OnClick;
f3.Show();
}
private void f3_OnClick(EnteredText txt)
{
// do something with the text or refire a new event.
}