[Solved] How to Add Items to List of Lists C# [closed]

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You can correct your structure as follows.

public class SisterFiles 
{
    public List<string> lstString;
}

public class FileGroups
{
    public List<SisterFiles> lstSisterFiles;
}

class Program
{
    static void Main(string[] args)
    {
        SisterFiles sisterFiles = new SisterFiles();
        sisterFiles.lstString.Add("My String");

        FileGroups fileGroup = new FileGroups();
        fileGroup.lstSisterFiles = new List<SisterFiles>();
        fileGroup.lstSisterFiles.Add(sisterFiles);
    }
}

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solved How to Add Items to List of Lists C# [closed]