如何使用ASP.NET和实体框架在C#中创建注销

public class User
{
    public int Id { get; set; }
    public string Username { get; set; }
    public string Password { get; set; }
}

<form runat="server">
    <div>
        <label for="username">Username:</label>
        <input type="text" id="username" runat="server" />
        <br />
        <label for="password">Password:</label>
        <input type="password" id="password" runat="server" />
        <br />
        <asp:Button ID="loginButton" runat="server" Text="Login" OnClick="LoginButton_Click" />
    </div>
</form>

protected void LoginButton_Click(object sender, EventArgs e)
{
    string username = username.Value;
    string password = password.Value;

    // 验证用户名和密码是否正确，可以使用实体框架查询数据库
    // ...

    // 如果验证成功，保存用户登录状态
    Session["Username"] = username;
    Response.Redirect("Home.aspx");
}

<form runat="server">
    <div>
        <asp:Button ID="logoutButton" runat="server" Text="Logout" OnClick="LogoutButton_Click" />
    </div>
</form>

protected void LogoutButton_Click(object sender, EventArgs e)
{
    // 清除用户登录状态
    Session.Clear();
    Session.Abandon();
    Response.Redirect("Login.aspx");
}