regarding C# adding objects to list using foreach loop

Question

foreach (string f in fileName)
{
    if (list.Where(p => p.FileName.Trim().Equals(f.Trim(), StringComparison.OrdinalIgnoreCase)).Count() == 0)
    {
        Serve         


        

Answer 1

Becasue you're adding the same instance each time, just overwriting its properties. You need

projectfile = new WhateverClassNameProjectFileIs();

at the top of your innermost foreach loop.