John Gill Commentary Daniel 5:13

"Then was Daniel brought in before the king. The king spake and said unto Daniel, Art thou that Daniel, who art of the children of the captivity of Judah, whom the king my father brought out of Judah?" — Daniel 5:13 (ASV)

Then was Daniel brought in before the king
Proper officers being sent to seek and find him; and having fetched him from his house or apartment where he lived, which seems to have been in the city of Babylon, though not very probably at court as formerly, he was introduced in form into the king's presence; and the king spoke and said to Daniel, are you that Daniel, which
are of the children of the captivity of Judah, whom my father the king
brought out of Judea ?

by which it appears he did not know him, at least had forgot him; not having admitted him to any familiarity with him, as his grandfather had done; and though the queen had given such great commendations of him, yet the king does not treat him with that respect as might have been expected, and as Nebuchadnezzar did, (Daniel 4:9) , but seems to reproach him with his servile condition, being a captive whom his grandfather had brought out of Judea, as it were triumphing over him and his people; which shows the haughtiness of his heart, which was not brought down by this consternation and fright he was thrown into.