Attempt to invoke virtual method '...' on a null object reference
49
What is a NullPointerException, and how do I fix it?
31537
Checking for null before event dispatching... thread safe?
20892
C# nullable string error
7935
CS0120: An object reference is required for the nonstatic field, method, or property 'foo'
95
Calling virtual functions inside constructors
92187
Unable to cast object of type 'System.DBNull' to type 'System.String`
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#?
72740
Invoking methods with optional parameters through reflection
80631
NullPointerException but compiling?
92446
C#: How to pass null to a function expecting a ref?
122276
Error: Unable to generate a temporary class (result=1) ... When Invoking Methods on a Web Service
1605
What is the reason behind "non-static method cannot be referenced from a static context"?
88920
Is using NULL references OK?
28348
How do I handle null or optional DLL struct parameters
42958
Method Overloading for null argument
81518
Find out what variable is throwing a NullPointerException programmatically