private void loginButton_Click(object sender, EventArgs e)
{
	username = usernameTextBox.Text;
	password = passwordTextBox.Text;

	if (String.IsNullOrEmpty(username))
	{
		MessageBox.Show("Please input username!", "Warning!",
			MessageBoxButtons.OK, MessageBoxIcon.Warning);
		return;
	}

	if (String.IsNullOrEmpty(password))
	{
		MessageBox.Show("Please input password!", "Warning!",
			MessageBoxButtons.OK, MessageBoxIcon.Warning);
		return;
	}

	loginButton.Text = "Logging...";

	string usernameResult = Database.access.GetColumnData(NCLib.ValueType.VALUETYPE_STRING, "accounts", "username", "username", username, true);
	string passwordResult = Database.access.GetColumnData(NCLib.ValueType.VALUETYPE_STRING, "accounts", "password", "password", Hash.SHA1(password), true);
	if (usernameResult != username)
	{
		MessageBox.Show("This account doesn't exist.", "Error!",
			MessageBoxButtons.OK, MessageBoxIcon.Error);
		loginButton.Text = "Login";
		return;
	}

	if (usernameResult == username && passwordResult == Hash.SHA1(password))
	{
		string hwidInfo = HWID.getHWID().ToString().Replace(" ", "");
		string hwidResult = Database.access.GetColumnData(NCLib.ValueType.VALUETYPE_STRING, "accounts", "hwid", "username", username, true);
		string rankResult = Database.access.GetColumnData(NCLib.ValueType.VALUETYPE_INT32, "accounts", "rank", "username", username, true);
		if (hwidInfo != hwidResult && rankResult != "1" && rankResult != "3")
		{
			MessageBox.Show("Your HWID doesn't match. Your account has been locked. Ask for a reset.", "Error!",
				MessageBoxButtons.OK, MessageBoxIcon.Error);
			Database.access.Update("accounts", "rank", "1", "username", username);
			loginButton.Text = "Login";
			return;
		}

		if (rankResult == "0")
		{
			MessageBox.Show("Your account is banned.", "Error!",
				MessageBoxButtons.OK, MessageBoxIcon.Error);
			loginButton.Text = "Login";
			return;
		}
		else if (rankResult == "1")
		{
			MessageBox.Show("Your account is locked due to HWID change.", "Error!",
				MessageBoxButtons.OK, MessageBoxIcon.Error);
			loginButton.Text = "Login";
			return;
		}
		else if (rankResult != "2" && rankResult != "3")
		{
			MessageBox.Show("Your rank isn't recognized.", "Error!",
				MessageBoxButtons.OK, MessageBoxIcon.Error);
			loginButton.Text = "Login";
			return;
		}

		string[] logValues = { Convert.ToString(0), username, Functions.getIP(), DateTime.Now.ToString(), "Client login" };
		Database.access.Insert("logs", logValues);

		Database.access.Update("accounts", "ip", Functions.getIP(), "username", username);
		Database.access.Update("accounts", "pcname", Functions.getPCName(), "username", username);

		this.Hide();
		var result2 = new TestApp().ShowDialog();

		if (result2 == DialogResult.Cancel)
			this.Close();
	}
	else
	{
		MessageBox.Show("The username or the password is wrong, please try again.", "Error!",
			MessageBoxButtons.OK, MessageBoxIcon.Error);
	}

	loginButton.Text = "Login";
}