Calling Button object from another winform

sheen buhay

Hi,

I need to know on how to disable a certain button in another form.
An illustration is something like:
Form1 - Button1
I am using Form2 to access Button1 object and calling a form within my Form2.
---
Form1 frm1 = new Form1();
frm1.button1.enabled = false;
---

That snippet above is not working. The button1 is not disabled.

Thanks.

10 Replies

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Kunal Vaishya14y ago
Dear have you try this

            frm1.Controls["button1"].Enabled = false;

            Form2 Objf2 = new Form2();
            Objf2.Controls["button1"].Enabled = false;
            Objf2.Show();
0
Ehtesham14y ago
And also make sure your invoking parameterised constructor instead of default

new form2().show();//this will not work with respect to my example

you need to call using

new form2(this).show();

0
Vulpes14y ago
The most likely reason why my suggestion doesn't work is because button1 has not been placed directly on Form1 but is within some container such as a panel or groupbox.

Although it's still possible to 'drill down' through the Controls collections of these containers to get at it, an easier approach is to just change the button's Modifier property from private (the default) to internal as Ehtesham suggested. You can then do:

Form1 frm1 = (Form1)Application.OpenForms["Form1"];
frm1.button1.Enabled = false;
0
Ehtesham14y ago
Make sure you have passed form1 instance to parameterised constructor of form2

public Form2(Form1 frmref)
            : this()
        {
            this.FrmRef = frmref;
            this.checkBox1.Checked = true;
        }

Use this.FrmRef.button1.Enabled=true;

The code snippet was tested and it should work
0
sheen buhay14y ago
@vulpes,

I appreciate your time looking into this however I got an error "Object reference not set to an instance of an object."

Thanks.
0
Ehtesham14y ago
Hi

Consider the below code

Form1.cs

public partial class Form1 : Form
    {

        public Form1()
        {
            InitializeComponent();

        }

        private void button1_Click(object sender, EventArgs e)
        {
            new Form2(this).Show();
        }
    }

Form2.cs

public partial class Form2 : Form
    {
        Form1 FrmRef = null;
        public Form2()
        {
            InitializeComponent();
        }
        public Form2(Form1 frmref)
            : this()
        {
            this.FrmRef = frmref;
            this.checkBox1.Checked = true;
        }

        private void checkBox1_CheckedChanged(object sender, EventArgs e)
        {
            this.FrmRef.button1.Enabled = this.checkBox1.Checked;
        }
    }

Note : At design time set the button1 Modifier property on Form1 to internal

hope you got an idea now
0
Vulpes14y ago
You need to obtain a reference to the existing instance of Form1 rather than create another one.

So I'd try:

Form1 frm1 = (Form1)Application.OpenForms["Form1"];
frm1.Controls["button1"].Enabled = false;
0
Kunal Vaishya14y ago
Dear try this

frm1.Controls["button1"].Enabled = false;

Using this you can set property

            Form2 Objf2 = new Form2();
            Objf2.Controls["button1"].Visible = false;
            Objf2.Show();
0
sheen buhay14y ago
@kunal,

i appreciate your time looking into this however your response is the same as my original post. that code is not working.

thanks.
0
Kunal Vaishya14y ago
you can also use like this

Directly as per requirement

Form1.button1.enabled = false;

or if you show form you should set enable before show
0