CODEWITHSUNDEEP
c#
Majid Khan
Majid Khan

Reputation: 111

Hide a custom input form

I have three forms in my application.

Form1 is the main form. Form2 is a form with two input fields. Form3 is a password verification form which is triggered from Form1 and upon successful authentication, Form2 is shown.

Form1 -> Form3 -> Form2

private void button1_Click(object sender, EventArgs e)
{
    if (string.IsNullOrEmpty(this.textBox_entry_password.Text))
    {
        MessageBox.Show("Please enter a password", "Error", MessageBoxButtons.OK,
                        MessageBoxIcon.Error, MessageBoxDefaultButton.Button1);
        this.textBox_entry_password.Focus();
    }

    else
    {
        // Authentication not Implemented so far
        Form Form2 = new Form2();
        Form2.StartPosition = FormStartPosition.CenterScreen;

        // Code for hiding Form3 -- Needed ????
        Form2.ShowDialog();
    }

I want Form1 to stay as such and hide Form3 and show Form2.

this.hide()

hides Form1.

If i try 

Form Form3 = new Form3();
Form3.Hide();

It does nothing. Form3 stays right there.

How do i hide Form3?

Upvotes: 1

Views: 152

Answers (3)

groverboy
groverboy

Reputation: 1135

Ther are many ways to do this. Below is an approach that I like because the password form is only concerned with obtaining and authenticating a password, and knows nothing about Form1 and Form2.

Code in Form3:

private void button1_Click(object sender, EventArgs e)
{
    if (string.IsNullOrEmpty(this.textBox_entry_password.Text))
    {
        MessageBox.Show("Please enter a password", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error, MessageBoxDefaultButton.Button1);
        this.textBox_entry_password.Focus();
    }
    else
    {
        // Authentication code here
        // if (isAuthenticated)
        // {
        //     DialogResult = DialogResult.OK;
        //     Close(); // hides and closes the form
        // }
     }
}

Code in Form1, to use Form 3 and Form2:

var dialogResult = DialogResult.Cancel;

// Always explicitly dispose a form shown modally; using clause will do this.
using (var form3 = new Form3())
{
    dialogResult = form3.ShowDialog(this);
}

if (dialogResult == DialogResult.OK) // password authenticated
{
    // Always explicitly dispose a form shown modally; using clause will do this.
    using (var form2 = new Form2())
    {
        dialogResult = form2.ShowDialog(this);
    }
}

Upvotes: 0

user2905764
user2905764

Reputation:

Create an overload of your Form3() constructor and pass Form1 instance to it. 

private Form form;
public Form3(Form frm)
{
  form = frm;
}

Now wherever you want to hide/show form1, just use form.Hide(), form.Show();

In your case use

if (string.IsNullOrEmpty(this.textBox_entry_password.Text))
        {
            MessageBox.Show("Please enter a password", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error, MessageBoxDefaultButton.Button1);
            this.textBox_entry_password.Focus();
        }

        else
        {

            // Authentication not Implemented so far

            Form Form2 = new Form2();
            Form2.StartPosition = FormStartPosition.CenterScreen;

            // Code for hiding Form3 -- Needed ????
            Form2.ShowDialog();
            this.Hide();
            form.ShowDialog();

        }

Upvotes: 0

Lamloumi Afif
Lamloumi Afif

Reputation: 9081

try this :

  Form2 a = new Form2 ();
     a.Show();
     this.Close();

in the button click event inside Form3

Upvotes: 1

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