Step 1: Click New Project, then select Visual C# on the left, then Windows and then select Windows Forms Application. Name your project "LoginForm" and then click OK
Step 2: Design your login form as below

Step 3: Create a user table, then add the user table to Entity Framework Model First as below

Step 4: Add a click event handler to the button
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace LoginForm
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void txtUsername_KeyPress(object sender, KeyPressEventArgs e)
{
if (e.KeyChar == (char)13)//Enter key
txtPassword.Focus();
}
private void txtPassword_KeyPress(object sender, KeyPressEventArgs e)
{
if (e.KeyChar == (char)13)
btnLogin.PerformClick();
}
private void btnLogin_Click(object sender, EventArgs e)
{
if (string.IsNullOrEmpty(txtUsername.Text))
{
MessageBox.Show("Please enter your username.", "Message", MessageBoxButtons.OK, MessageBoxIcon.Warning);
txtUsername.Focus();
return;
}
try
{
using (TestEntities test = new TestEntities())
{
//using linq to query data
var query = from o in test.Users
where o.Username == txtUsername.Text && o.Password == txtPassword.Text
select o;
//check if user exists
if (query.SingleOrDefault() != null)
{
MessageBox.Show("You have been successfully logged in.", "Message", MessageBoxButtons.OK, MessageBoxIcon.Information);
//Add your code process login here
}
else
{
MessageBox.Show("Your username or password is incorrect.", "Message", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "Message", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}
}
}
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