"Kejriwal remained with the religious preacher for about 30 minutes," an AAP spokesman said.
Dhadrianwale survived a murderous assault allegedly by men from radical Sikh group Damdami Taksal last week in which his associate was killed.
Taksal chief Harnam Singh Dhumma has justified the attack.
Kejriwal came by train and left by air for the national capital, the spokesman said.
He inquired about Dhadrianwale's health and took first-hand information about the attack, which occurred on May 17 in Ludhiana district, when his aide Bhupinder Singh Khalsa was shot dead as they halted at the venue of a road-side 'Chhabeel' put up by the assailants as a part of a conspiracy to kill the Sikh preacher.
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Hitting out at Kejriwal, the Congress today said that he "knows nothing" about business and wants to "confuse" the people of Punjab.
"He (Kejriwal) is roaming the whole state to announce his election manifesto but he is not saying how will he fulfil those promises," former Industries minister of Punjab Avatar Henry said.
"He is promising that he will bring back the state's industries back on track. I want to ask him, how many new industries have you helped set up in Delhi? How many old industries have you helped revive? He is in power in Delhi, if he hasn't done anything there, how will he bring a change here?" he asked.