Why can t I call a public method in another class

Question

I have got these two classes interacting and I am trying to call four different classes from class one for use in class two   The methods are public and they do return values but for some reason there is not a connection being made  The error I get when I try is   An object reference is required for the nonstatic field  method  or property  GradeBook  method I want called       I have everything initialized  I don t want to create the methods as static  I read over the specifics of my assignment again and I m not even supposed to but I can t seem to get this to work anyway I word it   myGradeBook  method  GraceBook  method   It all seems to create errors   The current errors   The best overloaded method match or  System Console WriteLine string  object   has some invalid arguments   Arugment  2   cannot convert from  method group  to  object    I m not even sur what those mean      EDIT  I just fixed that problem thanks to the Step Into feature of Visual Studio  I don t know why it took me so long to use it

User · Answer

You have to create a variable of the type of the class, and set it equal to a new instance of the object first.

GradeBook myGradeBook = new GradeBook();

Then call the method on the obect you just created.

myGradeBook.[method you want called]

User · Answer

For example 1 and 2 you need to create static methods   public static string InstanceMethod    return  Hello World      Then for example 3 you need an instance of your object to invoke the method   object o   new object    string s   o InstanceMethod

User · Answer

You re trying to call an instance method on the class   To call an instance method on a class you must create an instance on which to call the method   If you want to call the method on non-instances add the static keyword   For example  class Example     public static string NonInstanceMethod         return  static         public string InstanceMethod          return  non-static          static void SomeMethod       Console WriteLine Example NonInstanceMethod       Console WriteLine Example InstanceMethod         Does not compile   Example v1   new Example      Console WriteLine v1 InstanceMethod

User · Answer

It sounds like you re not instantiating your class  That s the primary reason I get the  an object reference is required  error   MyClass myClass   new MyClass      once you ve added that line you can then call your method  myClass myMethod      Also  are all of your classes in the same namespace  When I was first learning c  this was a common tripping point for me

User · Answer

For example 1 and 2 you need to create static methods   public static string InstanceMethod    return  Hello World      Then for example 3 you need an instance of your object to invoke the method   object o   new object    string s   o InstanceMethod

User · Answer

It sounds like you re not instantiating your class  That s the primary reason I get the  an object reference is required  error   MyClass myClass   new MyClass      once you ve added that line you can then call your method  myClass myMethod      Also  are all of your classes in the same namespace  When I was first learning c  this was a common tripping point for me

User · Answer

You re trying to call an instance method on the class   To call an instance method on a class you must create an instance on which to call the method   If you want to call the method on non-instances add the static keyword   For example  class Example     public static string NonInstanceMethod         return  static         public string InstanceMethod          return  non-static          static void SomeMethod       Console WriteLine Example NonInstanceMethod       Console WriteLine Example InstanceMethod         Does not compile   Example v1   new Example      Console WriteLine v1 InstanceMethod

User · Answer

You have to create a variable of the type of the class, and set it equal to a new instance of the object first.

GradeBook myGradeBook = new GradeBook();

Then call the method on the obect you just created.

myGradeBook.[method you want called]

User · Answer

You have to create a variable of the type of the class, and set it equal to a new instance of the object first.

GradeBook myGradeBook = new GradeBook();

Then call the method on the obect you just created.

myGradeBook.[method you want called]

User · Answer

You have to create a variable of the type of the class, and set it equal to a new instance of the object first.

GradeBook myGradeBook = new GradeBook();

Then call the method on the obect you just created.

myGradeBook.[method you want called]

User · Answer

It sounds like you re not instantiating your class  That s the primary reason I get the  an object reference is required  error   MyClass myClass   new MyClass      once you ve added that line you can then call your method  myClass myMethod      Also  are all of your classes in the same namespace  When I was first learning c  this was a common tripping point for me

User · Answer

You re trying to call an instance method on the class   To call an instance method on a class you must create an instance on which to call the method   If you want to call the method on non-instances add the static keyword   For example  class Example     public static string NonInstanceMethod         return  static         public string InstanceMethod          return  non-static          static void SomeMethod       Console WriteLine Example NonInstanceMethod       Console WriteLine Example InstanceMethod         Does not compile   Example v1   new Example      Console WriteLine v1 InstanceMethod

User · Answer

You re trying to call an instance method on the class   To call an instance method on a class you must create an instance on which to call the method   If you want to call the method on non-instances add the static keyword   For example  class Example     public static string NonInstanceMethod         return  static         public string InstanceMethod          return  non-static          static void SomeMethod       Console WriteLine Example NonInstanceMethod       Console WriteLine Example InstanceMethod         Does not compile   Example v1   new Example      Console WriteLine v1 InstanceMethod

User · Answer

For example 1 and 2 you need to create static methods   public static string InstanceMethod    return  Hello World      Then for example 3 you need an instance of your object to invoke the method   object o   new object    string s   o InstanceMethod

User · Answer

For example 1 and 2 you need to create static methods   public static string InstanceMethod    return  Hello World      Then for example 3 you need an instance of your object to invoke the method   object o   new object    string s   o InstanceMethod

User · Answer

It sounds like you re not instantiating your class  That s the primary reason I get the  an object reference is required  error   MyClass myClass   new MyClass      once you ve added that line you can then call your method  myClass myMethod      Also  are all of your classes in the same namespace  When I was first learning c  this was a common tripping point for me

[c#] Why can't I call a public method in another class?

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