public object Clone() {
  Matr m = (Matr)mat.Clone();
  for (int i=0; i<Vrs; i++)
    for (int j=0; j<Kol; j++)
      m.mat[i,j] = mat[i,j];
  return m;
}

public object Clone() {
  Matr m = (Matr)MemberwiseClone();
  m.mat = (double[,])mat.Clone();
  return m;
}