Date : November 22 2020, 02:59 PM
I wish did fix the issue. Just because you initialized the object doesn't mean that all of its properties are initialized: each of those carries its default value until you change it, and the default for a List (or any class-type object) is null (more details in this post). You need to initialize the list.
You can inline this in your Report constructor like:
code :
public class Report : BaseReportModel
    public Report()
        StudentSummary = new StudentSummary
            StudentDetails = new List<StudentDetails>()
    public StudentSummary StudentSummary { get; set; }
public class StudentSummary
    public StudentSummary()
        StudentDetails = new List<StudentDetails>();

    public string Name { get; set; }
    public List<StudentDetails> StudentDetails { get; set; }

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LINQ left join throwing System.NullReferenceException or System.InvalidCastException

LINQ left join throwing System.NullReferenceException or System.InvalidCastException

By : Ader
Date : March 29 2020, 07:55 AM
hope this fix your issue You are trying to cast an anonymous type to a string. Remove the use of the anonymous type as follows:
code :
var result = from t1 in subordinates.AsEnumerable()
                 join t2 in logins.AsEnumerable()
                 on t1.ADAccountName equals t2.ADAccountName
                 into joinedDT
                 from t2 in joinedDT.DefaultIfEmpty()
                 select (string)(t2.LoginName ?? t1.ADAccountName);

return result.ToList();
An unhandled exception of type 'System.NullReferenceException' Array of System::String

An unhandled exception of type 'System.NullReferenceException' Array of System::String

By : Sheetal Saraswat
Date : March 29 2020, 07:55 AM
wish help you to fix your issue You are creating a new array of Picture but you are not filling the array itself with any pictures so when you try to access the element at location 0 you will get null which is why you are getting the exception, you should do something like:
code :
TrackPicOnSlide = 2;
array<Picture::Picture^>^ ArrayPics = gcnew array<Picture::Picture^>(TrackPicOnSlide);
ArrayPics[0] = gcnew Picture;
ArrayPics[0]->path = "HI";
// etc..
MVC 5 EF 6.1.3 System.NullReferenceException

MVC 5 EF 6.1.3 System.NullReferenceException

By : Chintan Desai
Date : March 29 2020, 07:55 AM
should help you out Looks like _courseSvc is null. The stack trace shows that you don't even get to call EF.
ElasticSearch finds System.NullReferenceException, but not NullReferenceException - why?

ElasticSearch finds System.NullReferenceException, but not NullReferenceException - why?

By : Julien Marchand
Date : March 29 2020, 07:55 AM
this one helps. I have a basic ELK stack, where multiple machines push logs to an ElasticSearch (ES) server and I inspect them using Kibana. , Let's try to analyze the content of the message field:
code :
curl -XGET 'localhost:9200/accounts_2016_dev/_analyze?pretty' -d 'Object reference not set to an instance of an object. \r\nSystem.NullReferenceException: Object reference not set to an instance of'
    "token" : "nsystem.nullreferenceexception",
    "start_offset" : 57,
    "end_offset" : 87,
    "type" : "<ALPHANUM>",
    "position" : 12
System.NullReferenceException at System.Web.HttpRequest.FillInHeadersCollection()

System.NullReferenceException at System.Web.HttpRequest.FillInHeadersCollection()

By : Frederick Kagan
Date : March 29 2020, 07:55 AM
wish of those help You can use Response.Redirect ("Research.aspx", false); then the exception is not thrown (but the runtime will continue processing the current request).
Read more: https://support.microsoft.com/en-us/kb/312629
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