C# Error CS0574 – Name of destructor must match name of class

C# Error CS0573 – ‘field declaration’ : cannot have instance field initializers in structs

C# Error CS0572 – ‘type’ : cannot reference a type through an expression; try ‘path_to_type’ instead

C# Error CS0571 – ‘function’ : cannot explicitly call operator or accessor

C# Error CS0568 – Structs cannot contain explicit parameterless constructors

C# Error CS0549 – ‘function’ is a new virtual member in sealed class ‘class’

C# Error CS0548 – ‘property’ : property or indexer must have at least one accessor

C# Error CS0547 – ‘property’ : property or indexer cannot have void type

C# Error CS0546 – ‘accessor’ : cannot override because ‘property’ does not have an overridable set accessor

C# Error CS0545 – ‘function’ : cannot override because ‘property’ does not have an overridable get accessor

C# Error CS0544 – ‘property override’: cannot override because ‘non-property’ is not a property

C# Error CS0543 – ‘enumeration’ : the enumerator value is too large to fit in its type

C# Error CS0542 – ‘user-defined type’ : member names cannot be the same as their enclosing type

C# Error CS0540 – ‘interface member’ : containing type does not implement interface ‘interface’

C# Error CS0539 – ‘member’ in explicit interface declaration is not a member of interface

C# Error CS0538 – ‘name’ in explicit interface declaration is not an interface

C# Error CS0535 – ‘class’ does not implement interface member ‘member’

C# Error CS0534 – ‘function1’ does not implement inherited abstract member ‘function2’

C# Error CS0533 – ‘derived-class member’ hides inherited abstract member ‘base-class member’

C# Error CS0531 – ‘member’ : interface members cannot have a definition

C# Error CS0529 – Inherited interface ‘interface1’ causes a cycle in the interface hierarchy of ‘interface2’

C# Error CS0528 – ‘interface’ is already listed in interface list

C# Error CS0527 – Type ‘type’ in interface list is not an interface

C# Error CS0526 – Interfaces cannot contain instance constructors

C# Error CS0525 – Interfaces cannot contain fields

C# Error CS0523 – Struct member ‘struct2 field’ of type ‘struct1’ causes a cycle in the struct layout

C# Error CS0522 – ‘constructor’ : structs cannot call base class constructors

C# Error CS0516 – Constructor ‘constructor’ can not call itself

C# Error CS0515 – ‘function’ : access modifiers are not allowed on static constructors

C# Error CS0514 – ‘constructor’ : static constructor cannot have an explicit ‘this’ or ‘base’ constructor call

C# Error CS0513 – ‘function’ is abstract but it is contained in nonabstract class ‘class’

C# Error CS0509 – ‘class1’ : cannot derive from sealed type ‘class2’

C# Error CS0508 – ‘Type 1’: return type must be ‘Type 2’ to match overridden member ‘Member Name’

C# Error CS0507 – ‘function1’ : cannot change access modifiers when overriding ‘access’ inherited member ‘function2’

C# Error CS0506 – ‘function1’ : cannot override inherited member ‘function2’ because it is not marked “virtual”, “abstract”, or “override”

C# Error CS0505 – ‘member1’: cannot override because ‘member2’ is not a function

C# Error CS0504 – The constant ‘variable’ cannot be marked static

C# Error CS0503 – The abstract method ‘method’ cannot be marked virtual

C# Error CS0502 – ‘member’ cannot be both abstract and sealed

C# Error CS0501 – ‘member function’ must declare a body because it is not marked abstract, extern, or partial

C# Error CS0500 – ‘class member’ cannot declare a body because it is marked abstract

C# Error CS0470 – ‘method’ cannot implement interface accessor ‘accessor’ for type ‘type’. Use an explicit interface implementation

C# Error CS0463 – Evaluation of the decimal constant expression failed with error: ‘error’

C# Error CS0446 – Foreach cannot operate on a ‘Method or Delegate’

C# Error CS0443 – Syntax error, value expected

C# Error CS0442 – ‘Property’: abstract properties cannot have private accessors

C# Error CS0441 – ‘class’: a class cannot be both static and sealed

C# Error CS0439 – An extern alias declaration must precede all other elements defined in the namespace

C# Error CS0433 – The type TypeName1 exists in both TypeName2 and TypeName3

C# Error CS0432 – Alias ‘identifier’ not found

C# Error CS0431 – Cannot use alias ‘identifier’ with ‘::’ since the alias references a type. Use ‘.’ instead

C# Error CS0426 – The type name ‘identifier’ does not exist in the type ‘type’

C# Error CS0418 – ‘class name’: an abstract class cannot be sealed or static

C# Error CS0404 – ‘<' unexpected : attributes cannot be generic

C# Error CS0316 – The parameter name ‘name’ conflicts with an automatically-generated parameter name

C# Error CS0283 – The type ‘type’ cannot be declared const

C# Error CS0277 – ‘class’ does not implement interface member ‘accessor’. ‘class accessor’ is not public

C# Error CS0276 – ‘property/indexer’: accessibility modifiers on accessors may only be used if the property or indexer has both a get and a set accessor

C# Error CS0275 – ‘accessor’: accessibility modifiers may not be used on accessors in an interface

C# Error CS0274 – Cannot specify accessibility modifiers for both accessors of the property or indexer ‘property/indexer’

C# Error CS0273 – The accessibility modifier of the ‘property_accessor’ accessor must be more restrictive than the property or indexer ‘property’

C# Error CS0272 – The property or indexer ‘property/indexer’ cannot be used in this context because the set accessor is inaccessible

C# Error CS0271 – The property or indexer ‘property/indexer’ cannot be used in this context because the get accessor is inaccessible

C# Error CS0270 – Array size cannot be specified in a variable declaration

C# Error CS0269 – Use of unassigned out parameter ‘parameter’

C# Error CS0267 – The partial modifier can only appear immediately before ‘class’, ‘record’, ‘struct’, ‘interface’, or a method return type

C# Error CS0266 – Cannot implicitly convert type ‘type1’ to ‘type2’

C# Error CS0264 – Partial declarations of ‘type’ must have the same type parameter names in the same order

C# Error CS0263 – Partial declarations of ‘type’ must not specify different base classes

C# Error CS0262 – Partial declarations of ‘type’ have conflicting accessibility modifiers

C# Error CS0261 – Partial declarations of ‘type’ must be all classes, all structs, or all interfaces

C# Error CS0260 – Missing partial modifier on declaration of type ‘type’; another partial declaration of this type exists

C# Error CS0255 – stackalloc may not be used in a catch or finally block

CS0250 – Do not directly call your base class Finalize method. It is called automatically from your destructor

C# Error CS0249 – Do not override object.Finalize. Instead, provide a destructor

C# Error CS0248 – Cannot create an array with a negative size

C# Error CS0247 – Cannot use a negative size with stackalloc

C# Error CS0246 – The type or namespace name ‘type/namespace’ could not be found

C# Error CS0245 – Destructors and object.Finalize cannot be called directly

C# Error CS0244 – Neither ‘is’ nor ‘as’ is valid on pointer types

C# Error CS0243 – The Conditional attribute is not valid on ‘method’ because it is an override method

C# Error CS0239 – ‘member’ : cannot override inherited member ‘inherited member’ because it is sealed

C# Error CS0238 – ‘member’ cannot be sealed because it is not an override

C# Error CS0236 – A field initializer cannot reference the non-static field, method, or property ‘name’

C# Error CS0234 – The type or namespace name ‘name’ does not exist in the namespace ‘namespace’

C# Error CS0231 – A params parameter must be the last parameter in a formal parameter list

C# Error CS0230 – Type and identifier are both required in a foreach statement

C# Error CS0226 – An __arglist expression may only appear inside of a call or new expression

C# Error CS0225 – The params parameter must be a single dimensional array

C# Error CS0221 – Constant value ‘value’ cannot be converted to a ‘type’ (use ‘unchecked’ syntax to override)

C# Error CS0220 – The operation overflows at compile time in checked mode

C# Error CS0216 – The operator ‘operator’ requires a matching operator ‘missing_operator’ to also be defined

C# Error CS0215 – The return type of operator True or False must be bool

C# Error CS0206 – A property or indexer may not be passed as an out or ref parameter

C# Error CS0205 – Cannot call an abstract base member: ‘method’

C# Error CS0204 – Only 65534 locals, including those generated by the compiler, are allowed

C# Error CS0202 – foreach requires that the return type ‘type’ of ‘type.GetEnumerator()’

C# Error CS0201 – Only assignment, call, increment, decrement, and new object expressions can be used as a statement

C# Error CS0200 – Property or indexer ‘property’ cannot be assigned to — it is read only

C# Error CS0199 – Fields of static readonly field ‘name’ cannot be passed ref or out

C# Tips & Tricks

List of C# Compiler Errors