Interview Questions and Answers

Response.Cache.SetCacheability(HttpCacheability.NoCache);
Response.Cache.SetExpires(DateTime.UtcNow.AddHours(-1));
Response.Cache.SetNoStore();
                               

public class MyController : Controller
{
    private readonly IDatabaseService _databaseService;

    public MyController(IDatabaseService databaseService)
    {
        _databaseService = databaseService;
    }

    // Controller actions that use _databaseService
}

using (var scope = serviceProvider.CreateScope())
{
    var myScopedService = scope.ServiceProvider.GetRequiredService <MyScopedService>();
    // use the scoped object within this scope
}
                                 

using (var scope = serviceProvider.CreateScope())
{
    var myScopedService = scope.ServiceProvider.GetRequiredService
    <MyScopedService>();
    // use the scoped object within this scope
}

public class MyBackgroundService : IHostedService, IDisposable
{
    private readonly ILogger _logger;
    private readonly CancellationTokenSource _cancellationTokenSource;
    private readonly Task _backgroundTask;

    public MyBackgroundService(ILogger <MyBackgroundService> logger)
    {
        _logger = logger;
        _cancellationTokenSource = new CancellationTokenSource();
        _backgroundTask = Task.Run(BackgroundTask);
    }

    private async Task BackgroundTask()
    {
        while (!_cancellationTokenSource.IsCancellationRequested)
        {
        // Perform background work here
        await Task.Delay(TimeSpan.FromMinutes(5), _cancellationTokenSource.Token);
        }
    }

    public Task StartAsync(CancellationToken cancellationToken)
    {
        _logger.LogInformation("MyBackgroundService is starting.");
        return Task.CompletedTask;
    }

    public async Task StopAsync(CancellationToken cancellationToken)
    {
        _logger.LogInformation("MyBackgroundService is stopping.");
        _cancellationTokenSource.Cancel();
        await Task.WhenAny(_backgroundTask, Task.Delay(-1, cancellationToken));
    }

    public void Dispose()
    {
        _cancellationTokenSource.Cancel();
    }
}

public class MyBackgroundService : BackgroundService
{
    private readonly ILogger <MyBackgroundService> _logger;

    public MyBackgroundService(ILogger <MyBackgroundService> logger)
    {
        _logger = logger;
    }

    protected override async Task ExecuteAsync(CancellationToken stoppingToken)
    {
        _logger.LogInformation("MyBackgroundService is starting.");

        while (!stoppingToken.IsCancellationRequested)
        {
            // Perform background work here
            await Task.Delay(TimeSpan.FromMinutes(5), stoppingToken);
        }

         _logger.LogInformation("MyBackgroundService is stopping.");
    }
}

protected void btnSubmit_Click(object sender, EventArgs e)
{
    // Force all validation controls to run
    Page.Validate();

    // Check if all validation controls passed
    if (Page.IsValid)
    {
    // Process the form data
    }
}

public class RequestLoggerModule : IHttpModule
{
    public void Init(HttpApplication context)
    {
        // Register for the BeginRequest event
        context.BeginRequest += new EventHandler(OnBeginRequest);
    }

    public void Dispose()
    {
        // Clean up any resources used by the module
    }

    private void OnBeginRequest(object sender, EventArgs e)
    {
        // Log information about the request
        HttpContext context = HttpContext.Current;
        string requestUrl = context.Request.Url.ToString();
        string clientIp = context.Request.UserHostAddress;
        string userAgent = context.Request.UserAgent;
        string logMessage = String.Format("{0} - {1} - {2}", clientIp, requestUrl, userAgent);
        Log.Write(logMessage);
    }
}
                              

<sessionState mode="SQLServer"
sqlConnectionString="Data Source=myServer;Initial Catalog=myDB;User
Id=myUsername;Password=myPassword;"
cookieless="false" timeout="20" />

<%@ OutputCache Duration="60" VaryByControl="Panel1" %>
<asp:Panel ID="Panel1" runat="server">

</asp:Panel>