How to fill a combo box on C# with the name files from a directory

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C#

Hello i have C# project and when i try to add code

private void button5_Click(object sender, EventArgs e)
      {
          {
              string[] files = System.IO.Directory.GetFiles(Path.Combine(@"C:\POS\Book\Book\" + label6.Text, "Prijave"));
              {

                  this.comboBox2.Items.AddRange(files);
              }

i am just getting paths.
with out of

Path.Combine

i am getting nothing

What I have tried:

I tried

string[] filePaths = Directory.GetFiles(@"C:\POS\Book\Book\" + label6.Text, "Prijave");
foreach (string file in filePaths)
{
    combobox2.items.add(file);
}

still same issue i get nothing my combobox is empty