How To Validate The Username And Password As Userdefiene Thing I Winform?

Question

1.00/5 (1 vote)

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VS2008

i want to validate the username and password in winformm using visual c#.

in program.cs class,

C#

 static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new Form1());
            if(Username==abcd amp;& Password==abcd)
            {
                DialogResult=DialogResult.OK;

            }
            else
            {
                MessageBox.Show("invalid Username and password);
            }

        }
    }
}
i want to validate the login page , when i enter the username as "abcd" and 
password "abcd" it would show next form if it is wrong it show message box as wrong

Posted 28-Aug-15 21:18pm

Xaavier

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OriginalGriff · Answer 1 · 2015-08-28T21:37:00

Solution 1

Don't do it there. The validation code will only ever be executed when the form is closed - which terminates your application.

In your normal Main form, edit the Load event handler and display your login form from that using the ShowDialog method.
If the validation fails, show the messagebox and call Application.Exit.
If it passes, just continue and your main form will be displayed.

Posted 28-Aug-15 21:37pm

OriginalGriff

Comments

Xaavier 29-Aug-15 5:45am

can you please share the code....

OriginalGriff 29-Aug-15 6:05am

You are kidding, right? :laugh:
You know how to handle an event, you know how to create a form instance, you know how to use ShowDialog.
So what code do you want me to write that you can't?

csdp000 · Answer 2 · 2015-08-29T07:17:00

1.call loginform and flipped the MainForm instance in the argument.
2.if login succ in loginform , show MainForm
3.fail - > application.exit();

http://csdp000.org/?p=154

namespace test  
{
    class LoginForm : Form
    {
        private Form _mainForm; // Main Form Instance

        private TextBox pwTextBox;
        private Button loginButton;
        private TextBox idTextBox; 

        public LoginForm(Form form)
        {
            InitializeComponent();
            _mainForm = form; 
        }

        private void InitializeComponent()
        {
            this.idTextBox = new System.Windows.Forms.TextBox();
            this.pwTextBox = new System.Windows.Forms.TextBox();
            this.loginButton = new System.Windows.Forms.Button();
            this.SuspendLayout(); 

            this.idTextBox.Location = new System.Drawing.Point(12, 12);
            this.idTextBox.Name = "idTextBox";
            this.idTextBox.Size = new System.Drawing.Size(159, 21);
            this.idTextBox.TabIndex = 0; 

            this.pwTextBox.Location = new System.Drawing.Point(12, 39);
            this.pwTextBox.Name = "pwTextBox";
            this.pwTextBox.Size = new System.Drawing.Size(159, 21);
            this.pwTextBox.TabIndex = 1; 

            this.loginButton.Location = new System.Drawing.Point(177, 10);
            this.loginButton.Name = "loginButton";
            this.loginButton.Size = new System.Drawing.Size(121, 50);
            this.loginButton.TabIndex = 2;
            this.loginButton.Text = "Login";
            this.loginButton.UseVisualStyleBackColor = true;
            this.loginButton.Click += new System.EventHandler(this.loginButton_Click); 

            this.ClientSize = new System.Drawing.Size(310, 70);
            this.Controls.Add(this.loginButton);
            this.Controls.Add(this.pwTextBox);
            this.Controls.Add(this.idTextBox);
            this.Name = "LoginForm";
            this.Text = "Login";
            this.ResumeLayout(false);
            this.PerformLayout();

        }

        private void loginButton_Click(object sender, EventArgs e)
        {
            if (idTextBox.Text == "abcd" && pwTextBox.Text == "abcd")
            {
                MessageBox.Show("Login");
                this.Hide();
                _mainForm.Show();
            }
            else MessageBox.Show("Fail");
        }
    }
}
 
namespace test
{
    static class Program 
    { 
        [STAThread]
        static void Main() // entry point 
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new LoginForm(new Form1()));
        }
    }
}