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Home/ Questions/Q 7557447
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Editorial Team
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Editorial Team
Asked: May 30, 20262026-05-30T12:08:02+00:00 2026-05-30T12:08:02+00:00

I have a List of strings called Names in a class called data .

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I have a List of strings called Names in a class called data. The code for the list looks like this:

public class data {
  public List<string> Names = new List<string>();
  Names.Add("C1");
}

When I run the program, the code fails on the line with names.Add("C1");

[edit] The error message given is “The type or namespace Names could not be found (Are you missing a using directive or an assembly reference?)“

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1 Answer

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  1. Editorial Team
    Editorial Team
    2026-05-30T12:08:03+00:00Added an answer on May 30, 2026 at 12:08 pm

    I am going to take a shot in the dark and guess your class looks like this:

    public class data
    {
        public List<string> Names = new List<string>();
        Names.add("C1");
    }
    

    In this case the problem is infact the add method is not a member or method declaration and cannot exist where it is. One solution would be to add that in the constructor:

    public class data
    {
        public List<string> Names = new List<string>();
    
        public data()
        {
            Names.Add("C1");
        }
    }
    

    Another option is to add it to the declaration:

    public List<string> Names = new List<string>(){ "C1" };
    
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