Please, how do I fix access to the is denied in C# window application

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C#4.0

System.UnauthorizedAccessException: 'Access to the path 'C:\Users\user\Desktop\New folder (3)' is denied.'

Please, am facing problem in my c# window form application.am try to delete a file after zip the file using using File.delet() method.but it giving an error that System.UnauthorizedAccessException: Access to the path C:\Users\user\Desktop\New folder (3)' is denied.

What I have tried:

public bool CallZiperFolder(List<string> listSelectedFile, string word, string DestinationPath, string ZipName)
        {
            if (listSelectedFile != null)
            {
                Thread thread = new Thread(t =>
                {
                    using (ZipFile zip = new ZipFile())
                {
                    zip.Password = word;
                    // DirectoryInfo directory = new DirectoryInfo(FolderPathToZip);
                    //  zip.Save(Format("{0}{1}.zip", directory.Parent.FullName, directory.Name));
                    foreach (var file in listSelectedFile)
                    {
                            if (YesDo)
                            {
                                zip.AddDirectory(file);
                                DirectoryInfo directory = new DirectoryInfo(file); 
                                File.Delete(file);
                            }
                            else
                            {
                                zip.AddDirectory(file);
                            }
                        }
                    zip.SaveProgress += Zip_SaveProgress;
                    zip.Save(DestinationPath + "\\" + ZipName + ".zip");
                }
            })
                { IsBackground = true };
            thread.Start();
                return true;
            }
            else
                return false;
        }

        private void compressASZipToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (string.IsNullOrEmpty(textBox.Text))
            {
                MessageBox.Show("please select a file", "Message", MessageBoxButtons.OK, MessageBoxIcon.Information);
                textBox.Focus();
                return;
            }
            foreach (object item in listBox.Items)
                listSelectedFile.Add(item.ToString());
            DestinationPath = txtBoxdestination.Text;
            ZipName = txtBoxFileName.Text;
            status = CallZiperFolder(listSelectedFile, Password, DestinationPath, ZipName);
            if (status == true)
                MessageBox.Show("Successfully Zipped :", "Successfull", MessageBoxButtons.OK, MessageBoxIcon.Information);
            else
                MessageBox.Show("Some Error Occurred :", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
}