Can I Create Instance Of One Class In Other Class Which I Wrote In Notepad And Compile Through Developer Command Prompt In C#.Net

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I have created a folder with name learncs in c drive and it contains two notepads and i wrote code in them and saved as Class1.cs and Class2.cs.(C:\learncs\Class1.cs,Class2.cs).

code in Class1.cs

C#

using System;
class Class1
{
  public void Display()
  {
    Console.WriteLine("This is Display() in Class1");
  }
}

code in Class2.cs

C#

using System;
class Class2
{
  static void Main()
  {
    Class1 c=new Class1();
    c.Display();
    Console.ReadLine();
  }
}

When i compile Class2.cs it is giving me the error like

error CS0246 :The type or namespace name 'Class1' could not be found(are you missing a using directive or an assembly rererence?)

so i tried by adding name space also i.e., namespace learncs before the class type and also using learncs statement in Class2.cs but not able to resolve it .Can anyone help me out plz...

Posted 30-Apr-15 16:42pm

Pras Rafi

Updated 30-Apr-15 17:19pm

PIEBALDconsult

v2

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virang_21 30-Apr-15 23:04pm

Declare your class1 as public.

Access modifiers https://msdn.microsoft.com/en-us/library/ms173121.aspx

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PIEBALDconsult · Answer 1 · 2015-04-30T17:21:00

Yes, if you do it right. Which are you trying to do?

0) Compile both into one EXE, the following works:
csc /t:exe class1.cs class2.cs

1) Compile Class1 into a DLL and compile Class2 into an EXE that refers to the DLL, the following gives errors like you describe:
csc /t:library class1.cs
csc /t:exe /r:class1.dll class2.cs

"
Classes and structs that are declared directly within a namespace (in other words, that are not nested within other classes or structs) can be either public or internal. Internal is the default if no access modifier is specified.
" -- MSDN

Karthik_Mahalingam · Answer 2 · 2015-04-30T17:30:00

Solution 2

make class1 as public

C#

public class Class1  // add public access modifier
   {
       public void Display()
       {
           Console.WriteLine("This is Display() in Class1");
       }
   }

Posted 30-Apr-15 17:30pm

Karthik_Mahalingam