Having “key is a directory name” exception

Question 1

S3DirectoryInfo dir= new S3DirectoryInfo(client, "bucketname", "sampledir/sample");
test.Create();
var files = dir.GetFiles();

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S3DirectoryInfo dir= new S3DirectoryInfo(client, "bucketname", "sampledir/sample");

test.Create();

var files = dir.GetFiles();

so using dir.GetFiles(), i can’t get the files inside the directory.
how can i solve this????

Question 2

Instead of above code use this below code it will work. The change is trailing slash.

S3DirectoryInfo dir= new S3DirectoryInfo(client, "bucketname","sampledir\sample");
    test.Create();
    var files = dir.GetFiles();

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S3DirectoryInfo dir= new S3DirectoryInfo(client, "bucketname","sampledir\sample");

test.Create();

var files = dir.GetFiles();

Question: