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public static long GetFilesSize(String path){
DirectoryInfo directoryInfo=new DirectoryInfo(path);
long length=0;
foreach( FileSystemInfo fsi in directoryInfo.GetFileSystemInfos() ) {
if ( fsi is FileInfo ) {
length += ((FileInfo)fsi).Length;
}
else {
length +=GetFilesSize(fsi.FullName);
}
}
return length;
}