query: c# windows service Object reference not set to an instance of an object
positive_passages.docid: 289
positive_passages.text: What is a NullReferenceException, and how do I fix it?
negative_passages.docid: 48221
negative_passages.text: Solving "The ObjectContext instance has been disposed and can no longer be used for operations that require a connection" InvalidOperationException
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negative_passages.text: WCF chokes on properties with no "set ". Any workaround?
negative_passages.docid: 140217
negative_passages.text: C# Reflection: How to get class reference from string?
negative_passages.docid: 151687
negative_passages.text: C# compile error: "Invoke or BeginInvoke cannot be called on a control until the window handle has been created."
negative_passages.docid: 127363
negative_passages.text: WPF, 'Object reference not set to an instance of an object' in Designer
negative_passages.docid: 65671
negative_passages.text: Error "Settings to access printer 'printername' are not valid" when printing from Windows service
negative_passages.docid: 137225
negative_passages.text: Accessing derived class property members from base class object in CSharp
negative_passages.docid: 61239
negative_passages.text: Windows service stops automatically
negative_passages.docid: 91943
negative_passages.text: What is the use of "ref" for reference-type variables in C#?
negative_passages.docid: 92187
negative_passages.text: Unable to cast object of type 'System.DBNull' to type 'System.String`
negative_passages.docid: 81752
negative_passages.text: Run a Windows Service as a console app
negative_passages.docid: 157468
negative_passages.text: Active Directory Administrative Center Crashes when updating object
negative_passages.docid: 26664
negative_passages.text: How can a windows service programmatically restart itself?
negative_passages.docid: 71955
negative_passages.text: WPF Dispatcher {"The calling thread cannot access this object because a different thread owns it."}
negative_passages.docid: 1087
negative_passages.text: The calling thread cannot access this object because a different thread owns it
negative_passages.docid: 73430
negative_passages.text: C# .Equals(), .ReferenceEquals() and == operator