[Solved] How to download multiple strings from the internet and check if one is true

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First of all this isn’t a great way to authenticate users. But assuming you’re just doing this to learn:

WebClient.DownLoadString() is getting the content of the page as one whole string. You will have to split the string. Something like this will work for your conditional:

        bool authenticated = false;
        WebClient client = new WebClient();
        string userinfoLines = client.DownloadString("http://pastebin.com/raw.php?i=LAUx2zxn");
        foreach (string userinfo in userinfoLines.Split(new[] {Environment.NewLine},StringSplitOptions.RemoveEmptyEntries))
        {
        if (userinfo == username.Text + ":" + password.Text)
        {
            authenticated = true;
            MessageBox.Show("Successfully logged in as " + username.Text + ".", Text, MessageBoxButtons.OK, MessageBoxIcon.Information);
            label1.Text = "Welcome, " + username.Text;
            label1.Visible = true;
            this.Hide();
            MainMenu ss = new MainMenu();
            ss.Show();
            break;
        }
        }
        if (!authenticated)
        {
            // Login failed, I added my own stuff here.
            MessageBox.Show("Invalid account info entered.\n If you want to buy an account msg\n YouRGenetics \nOn Skype\n Or Click On Buy Account", Text, MessageBoxButtons.OK, MessageBoxIcon.Error);
        }

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solved How to download multiple strings from the internet and check if one is true