How do I make a button in one form to do actions in another form

Question

Ok so I have two forms Form1 & form2

in "form1" I have a "TextBox" and a "Button" that is set to open "form2".
in "form2" I have a "Button" which is set "visible" to "false".

then I want in "form1" when the "TextBox" enters the text "Sample" it will make the button in "form2" "visible" set to "true".

Keep in mind that only "form1" is opened!

The thing I have is a login form where I want the user I've added to get a button visible when the "form2" is opened, but if that user isn't logged in it won't be visible - Thanks :3

You can either expose the Button control with a property (or change the accessibility from protected to public) in form2, or create a method to control the Button's visibility. `form2.SetButtonVisibility(true);` or something similar. — itsme86, Feb 27 '18 at 16:19
Additionally to @itsme86 - to get the reference of "form2" have a look at the following https://stackoverflow.com/questions/17514251/find-form-instance-from-other-class — Rand Random, Feb 27 '18 at 16:23

Radu Tataru · Answer 1 · 2018-02-27T16:35:38.970

0

         Form form = Application.OpenForms[0]; // OR Application.OpenForms["FormName"];

        textBox.TextChanged += (sender, args) =>
        {
            textBox.Text == "Sample" ? form.button.Visible = true : return;
        };

edited Feb 27 '18 at 16:35

answered Feb 27 '18 at 16:30

Radu Tataru

49
5

3

`return` isn't a valid expression in a ternary. – Jonathon Chase Feb 27 '18 at 16:54

score 0 · Accepted Answer · answered Feb 27 '18 at 16:32

In Form1 do the following:

Form2 form2;
public void button1_Click(Object sender, EventArgs a){
    //show form2
    this.form2 = new Form2();
    this.form2.Show();
}

//This event is up to you
this.textBox.KeyUp += (s,a) => { if(this.textBox.Text == "Sample") {
    this.form2.ShowButton();
}};

And in Form2:

public void ShowButton(){
    this.button.Visible = true;
}

This should do.

How do I make a button in one form to do actions in another form

2 Answers2