C# - Change text property of one Form from a second Form

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I've been having this issue for quite a time.

I'm using a LoginForm that when I click the textbox, a second Form called KeyboardForm appears. When I click a button on the KeyboardForm it's supposed to send it's text property and increment it to the text property of the textbox in the LoginForm.

I've been using a very unpractical way, that is using a public string that saves the input, and the KeyboardForm when closing, closes the LoginForm and Reloads it, causing the textbox to change to the designated value I inserted.

But that way it wouldn't change the textbox as I clicked the buttons, but instead would only change it after I reloaded it.

What I wanted to know is, if there is a way, from a second form, to change the textbox.text value in the LoginForm as I click the buttons on the KeyboardForm.

Sorry for the long description, and thank you for the patience.

Posted 3-Jul-12 5:15am

Steven Borges

Updated 3-Jul-12 5:16am

v2

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[no name] 3-Jul-12 11:22am

Pass the textbox to your keyboard form.

2 solutions

Solution 1

create an function in first form, call it from second form by creating an object of first form.
than pass the sting value to that form.

or else
u can call directly that textbox.text property through creating an object of first form from second form

Posted 3-Jul-12 5:30am

santosha epili

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Steven Borges 3-Jul-12 11:38am

Could you explain it better ^^
I'm kinda new to this, I unfortunately don't have your knowledge when it comes to coding.

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DamithSL · Accepted Answer · 2012-07-03T06:22:00

in your child form

C#

//delegate type for the event declare first
public delegate void UpdateEventHandler(object sender, EventArgs e);

public partial class KeyboardForm : Form
{

    //Next, the event itself is declared.
    public event UpdateEventHandler UpdateParent;

    public KeyboardForm()
    {
        InitializeComponent();
    }

    private void UpdateParent_Click(object sender, EventArgs e)
    {
        //Invoking an event
        if (UpdateParent != null)
            UpdateParent(this, null);
    }
}

in your login form

C#

public LoginForm()
{
    InitializeComponent();
}

private void login_Click(object sender, EventArgs e)
{
    KeyboardForm child = new KeyboardForm();
    // subscribe to child event 
    child.UpdateParent += new UpdateEventHandler(child_UpdateParent);
    child.Show();
}

void child_UpdateParent(object sender, EventArgs e)
{
    // increment text box value
    int newValue = int.Parse(textBox1.Text) +1;
    textBox1.Text = newValue.ToString();
}