Leak

Program.cs

using System.IO;
using System.Reflection;

GetResource1("MyApp.Program.cs");
GetResource2("MyApp.Program.cs");
ReadFile();

static string GetResource1(string path) {
    var asm = Assembly.GetEntryAssembly();
    var stream = asm.GetManifestResourceStream(path);
    var reader = new StreamReader(stream);
    return reader.ReadToEnd();
}

static string GetResource2(string path) {
    var asm = Assembly.GetEntryAssembly();
    using var stream = asm.GetManifestResourceStream(path);
    using var reader = new StreamReader(stream);
    return reader.ReadToEnd();
}

static void ReadFile() {
    new FileStream("a.txt", FileMode.Open, FileAccess.Read);
}