How to hide main form in c sharp

Question

2.00/5 (1 vote)

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I made a Staff Attendance Project, but I want to set a password and user name.

How do I prevent main program form appearing before login?

And after login how to hide the login form?

Posted 13-Mar-11 4:29am

Sendian

Updated 13-Mar-11 6:35am

Dalek Dave

v2

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Comments

Dalek Dave 13-Mar-11 12:36pm

Edited for Readability and Grammar.

7 solutions

Solution 1

The simplest way is to handle the Form.Load event of your main form.
Add:

formLogin fl = new FormLogin();
do
   {
   if (fl.ShowDialog() == DialogResult.Cancel)
      {
      Close();
      return;
      }
   } while (!LoginOK(fl.Username, fl.Password));

That will suspend loading the main form while the user logs in, and close the form if they cancel it.

It assumes your login form has appropriate properties, and you write a LoginOK methods to check the user details.

Posted 13-Mar-11 4:35am

OriginalGriff

Comments

Sendian 13-Mar-11 10:40am

by the way i call login form from main project form
at load mainForm {formLogin fl = new FormLogin();} But how to handle working or hide mainForm to login

OriginalGriff 13-Mar-11 10:48am

Follow the code I gave you: just creating the form instance does not cause it to display.

Solution 7

private void btnOk_Click(object sender, EventArgs e)
{

txtBoxPassword.Clear();
txtBoxloginname.Clear();
this.Visible = false;
Main mainForm = new mainForm();
mainForm.FormClosed += new FormClosedEventHandler(mainForm_FormClosed);
mainForm.ShowDialog();

}

private void mainForm_FormClosed(object sender, FormClosedEventArgs e)
{
    this.Visible = true;
}

This will work surely.

Posted 13-Mar-11 21:52pm

SwaxRak

Solution 3

what is the problem there. to show a form you have to do is call Show

LoginForm form = new LoginForm()<br />
form.<a href="http://msdn.microsoft.com/en-us/library/system.windows.forms.form.show.aspx">Show</a>]();<br />

to close

form.<a href="http://msdn.microsoft.com/en-us/library/system.windows.forms.form.close.aspx">Close</a>()

Posted 13-Mar-11 4:40am

Yusuf

Updated 13-Mar-11 4:41am

v2

Comments

OriginalGriff 13-Mar-11 10:48am

No, Show() won't work: It returns immediately. He needs ShowDialog() to prevent the main form continuing unit the username/password is correct.

Yusuf 13-Mar-11 11:13am

Absolutely right. What was I chewing?

OriginalGriff 13-Mar-11 11:15am

I don't want to know! :laugh:

Yusuf 13-Mar-11 11:21am

:-)

Solution 5

I think u need to set login form as the startup form.
u can set the startup form in Program.cs file from Solution Explorer

open Program.cs
u can see the line

Application.Run(new Form1());

u can replace Form1 with any form which has to be start first.

then if login is success then show the main page and u can hide the Login form using
Form1.Hide(); or u can close it using Form1.Close(); or Form1.Dispose();

Posted 13-Mar-11 9:04am

sharoncep

Updated 13-Mar-11 9:06am

v2

Comments

charles henington 14-Mar-11 14:40pm

You would have to use Form1.Hide(); using Form1.Close if is the MainForm will Close the Application imediately after login

Solution 6

Wait all why you give my this ways it is so easy

when you type loginForm.Close() or .Hide() or .Dispose() it is not possible

You Have to Write
{
Form1 f1 = new Form1();
f1.Show();
this.Hide();
}

You are make it so complicated

Posted 13-Mar-11 21:47pm

Sendian

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Henry Minute · Accepted Answer · 2011-03-13T04:37:00

Solution 2

This question is asked so often that it is getting boring.

If you had searched this forum before asking you might have found Login form [^] question and it's answers and wouldn't have needaed to ask.

Posted 13-Mar-11 4:37am

Henry Minute

Comments

Espen Harlinn 13-Mar-11 10:42am

You're right, it seems we have seen something like this before :)

Yusuf 13-Mar-11 11:22am

Agree. +5

Dalek Dave 13-Mar-11 12:36pm

Ho Ho Ho.

Sergey Alexandrovich Kryukov 13-Mar-11 15:32pm

No wonder that most trivial Questions are most popular, my 5.
--SA

Espen Harlinn · Accepted Answer · 2011-03-13T04:45:00

Solution 4

About 350 000 answers[^] - seems like somebody got this one fixed long ago :)

Best regards
Espen Harlinn

Posted 13-Mar-11 4:45am

Espen Harlinn

Comments

Sergey Alexandrovich Kryukov 13-Mar-11 15:35pm

Correct :-), a 5.
--SA

Espen Harlinn 13-Mar-11 16:01pm

Thanks SAKryukov :)