How To Add A Login Screen - C# [In-Depth]

[NadeHouse]

Let's Jump Right Into It...

Lets say you already have a fully working program and just want to add it that you need a password to lets say 'Activate' it. Without having to add a seperate form that starts at the begining...

You could do some thing like this

Goto your Form1.load and add something like

button1.Enabled = false;

And keep doing that till you disable every thing on start up, and then have a textbox and a button that checks if the password is correct then every thing will be re-enabled by doing

button1.Enabled = true;

------------------
You should be able to know that from doing what I am about to show...
This is going to be a loginscreen before your program starts


Start off by adding a Button and a Textbox.

Lets add a string...

string password;

Now a bit of this... (Don't worry pictures at the end)

password = textBox1.Text;

Add that stuff in the button1_Click -> This can be done by double clicking the button...

Now the first part.. Check if they even bothered to type some thing in

if (password == "")
{
     MessageBox.Show("Ha you forgot to type in st00f");
}

Basically if textbox1 is left blank, prompt this message

But what if they typed the correct password?

else if (password == "nadehousefortehlulz")
{
     this.Visible = false;
     Form2 NEXTWINDOW = new Form2();
     NEXTWINDOW.Show();
}

What this means is that the password we want them to enter will always be "nadehousefortehlulz" <-- PS this is how you change the password
and if it is valid we want the login screen to close and move to our next form, in this case Form2

Hang on.. What if they typed the wrong password?

else
{
     MessageBox.Show("Ha you are a noob", "Invalid Password")
}

This is our last check, if all else fails the program will read this code, and it is saying to show a messagebox saying what ever we put there

---

Wait, I want the password system you used in your trainer, where it closes on the 5th attempt!

This is simple

Above our code we will add

int fail = 1;

and inside our code when ever they do something wrong add

fail++;

This will add a count to fail

Thus fail = 2 now.
----

How to make the program close on the 5th attempt?

Add a timer,

if (fail ==5)
{
Application.Exit();
}


Now this is the fun part, notice how mine changes colour every time it goes up and the text changes on the label?


We could add things to the timer such as more if's

if (fail ==4)
{
   label1.ForeColor = System.Drawing.Color.Translator.FromHtml("#FF0000");
}

Hold up you may say, why HTML colours? I used to play a game where you could use HTML codes in your guild announcments so I know a few off by heart soo yeah >.>

Mess around with this people!

Show me your screenshots I wanna see what you younge minds can do!

Now for le picture

[Skinksteek]

Thanks Nadehousey! It helped me well.
Maybe may we chat on skype anytime?

Skype:
fablewow_xd

[Horror]

Usefull, but in this case only one password is the right one, ppl cant create accounts , etc ... So yea, but thats illegal on MPHH anyways ...

[mwxplayer]

I already know this and all knows to make a Simple login Screen

[NadeHouse]

I already know this and all knows to make a Simple login Screen

Thanks for the put down brew maybe next time il just post a picture of someone flipping you off as the post.

[Kenshin13]

Somehow this code looks simpler to me:

private int tries = 0;
private void button1_Click(object sender, EventArgs e)
{
	++tries;
	string password = textBox1.Text;
	if(password == NULL) MessageBox.Show("Ha you forgot to type in st00f");
	else 
		if(password == "nadehousefortehlulz")
		{
		   Visible = false;
		   Form2 NEXTWINDOW = new Form2();
		   NEXTWINDOW.Show();
		}
	else MessageBox.Show("Ha you are a noob", "Invalid Password");
	if(tries == 5) Application.Exit();
}

[mwxplayer]

Thanks for the put down brew maybe next time il just post a picture of someone flipping you off as the post.

ops not screen but form

[Slendyy]

Thanks 4 the steps

[Eidolon]

.NET fails unless you obfuscate (decompilernoobs are everywhere).
Nice share for the newbs anyway.

BTW check this out

.field private string password

.field private int32 tries

.NET is even recognized in a debugger.
Its really easy avoiding passwords this way so please don't use this way with any mindblowing info (like MPGH username + password)

[Jorndel]

Here you have an very short code, and easy to use.


+ Instead of making "many" small tutorials.
Go write a mini-book or so with tutorials
_____________________________________________


As said, using this, IS not a good way to make your applications safe.
It's mainly just one ASM code change, and you have bypassed it. [JE=JUMP IF EQUAL-TO-JNZ=Jump IF NOT EQUAL]

Or you just read it

[C4P]

Good job for making this tutorial, might help few people.

[NadeHouse]

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