Can a Second Form change First Form's text?-CodePudding

My form 2 is opened by form 1, like this:

Form2 fm2 = new Form2();

fm2.Show();

So now, can my form 2 change the text in the TextBox of the current form 1?

I have tried using the following:

Form1 fm1 = new Form1();

fm1.textBox_A.Text = "123";

But it is not working.

CodePudding user response：

Oh, I just found a way to do what I want.

for form2:

Form1 fm1;
public Form2(Form1 _Form1)
    {
        fm1 = _Form1;
        InitializeComponent();
        ...
    }

Then form1:

        private void Form1_Load(object sender, EventArgs e)
    {
        Form2 fm2 = new Form2(this);
        fm2.Show();
    }

    public string ChangeText
    {
        get { return this.textBox_A.Text; }
        set
        {
            this.textBox_A.Text = value;
        }
    }

So now I can use the following in form 2 to change the Text in current Form1 by Form2:

fm1.ChangeText= "YAAAAAAAAAAAAAAAA";

CodePudding user response：

in first step you should add new constructor in Form2

System.Windows.Forms.Form fm1;
public Form2(System.Windows.Forms.Form frm1)
{
    this.fm1 = frm1;
    InitializeComponent();
}

then just write this

fm1.textBox_A.Text = "123";