string rootFolderPath = @"\\server01\Report\queue\;
string destinationPath = @"\\server01\Report\Output\";
string filesToDelete = @"*.bt";
string[] fileList = System.IO.Directory.GetFiles(rootFolderPath, filesToDelete);
foreach (string file in fileList)
{
string moveTo = Path.Combine(destinationPath, Path.GetFileName(file));
System.IO.File.Move(file, moveTo);
}