# Exceptions

### Exceptions

When you make a request via the SDK, there is a chance of request failing due to various reasons. When such a failure happens, an exception corresponding to the error occurred is thrown.

***

### **Possible Exceptions**

* `BadRequestException` If the request returns with status code `400`
* `UnauthorizedException` If the request returns with status code `401`
* `ForbiddenException` If the request returns with status code `403`
* `NotFoundException` If the request returns with status code `404`
* `MethodNotAllowedException` If the request returns with status code `405`
* `TooManyRequestsException` If the request returns with status code `429`
* `PleaseContactBunqException` If the request returns with status code `500`. If you get this exception, please contact us preferably via the support chat in the bunq app.
* `UnknownApiErrorException` If none of the above mentioned exceptions are thrown, this exception will be thrown instead.

For more information regarding these errors, please take a look on the documentation page here: 

{% content-ref url="../../../../basics/errors" %}
[errors](https://doc.bunq.com/basics/errors)
{% endcontent-ref %}

***

### **Base exception**

All the exceptions have the same base exception which looks like this:

```csharp
   public class ApiException : System.Exception
    {
        public int ResponseCode { get;}

        /// <param name="responseCode">The HTTP Response code of the failed request.</param>
        /// <param name="message">The error messages related to this exception.</param>
        public ApiException(int responseCode, string message) : base(message)
        {
            // hidden code
        }
    } 
```

This means that each exception will have a response code and an error message related to the specific error returned by API.

***

### **Exception handling**

Since each API error has a distinct SDK exception type corresponding to it, you can catch the exact exceptions you expect 👏.

```csharp
using Bunq.Sdk.Context;
using Bunq.Sdk.Exception;

public class BadRequest
{
    private const string API_KEY = "Some invalid API key"
    private const string DESCRIPTION = "This will throw BadRequestException."
    
    public void Run()
    {
        try
        {
            ApiContext.Create(ApiEnvironmentType.SANDBOX, API_KEY, DEVICE_DESCRIPTION);
        }
        catch(BadRequestException error)
        {
            Console.WriteLine(error.getMessage())
            Console.WriteLine(error.getResponseCode())
        }
    }
}
```