Configuration :: Web Application Is Locked Up?
Dec 16, 2010
We have ASP.Net 2.0 application. It was running corretly and suddenly get loked up, when I kept opened a member edit page for 20 minutes or so. And after 20 minutes when I cliked on save. It is locked. Not it does not let me login. Niether it opens the login page sometimes.
This has happened twice.
In hosting server architecture we have two app servers and two db servers for fail over purposes.
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Object reference not set to an instance of an object.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.
Source Error: An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below
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HTTP Error 500.19 - Internal Server Error
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[Code]....
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Is this piece of code where I lock a part of the function correct? Or can it have use drawbacks when multiple sessions ask concurrently for the same Exam? Purpose is that client that first asks for the Exam will assemble it, all next clients will get the cached version.
public Exam GetExamByExamDto(ExamDTO examDto, int languageId)
{
Log.Warn("GetExamByExamDto");
lock (LockString)
{
if (!ContainsExam(examDto.id, languageId))
{
Log.Warn("Assembling ExamDto");
var examAssembler = new ExamAssembler();
var exam = examAssembler.createExam(examDto);
if (AddToCache(exam))
{
_examDictionary.Add(examDto.id + "_" + languageId, exam);
}
Log.Warn("Returning non cached ExamDto");
return exam;
}
}
Log.Warn("Returning cached ExamDto");
return _examDictionary[examDto.id + "_" + languageId];
}
I have a feeling that this isn't the way to do it.
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[Code]....
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