Attempt to invoke interface method on a null object reference while implement interface
49
What is a NullPointerException, and how do I fix it?
108336
Nullable Object must have a value #2
81518
Find out what variable is throwing a NullPointerException programmatically
6882
try catch exception always returns null
80018
Accessing class members on a NULL pointer
12827
Are nullable types reference types?
144204
Implementing the same interface at different generic instantiations
54938
Cannot invoke method or retrieve property from null object. Object returned by the following call stack is null. \"File\r\n\"
12296
How can I return NULL from a generic method in C#?
140738
Does setting Java objects to null do anything anymore?
156400
NullReferenceException when using NUnit
89755
Why is "throw null" not creating a compilation error in Java?
128903
ExecuteScalar throws NullReferenceException
45869
Why null cast a parameter?
10581
Avoiding NullPointerException in Java
92053
How to implement events through interface in C#?
34696
Why is TargetInvocationException treated as uncaught by the IDE?