It was when the poet-turned-politician was spelling out his party's priorities vis-a-vis Uttar Pradesh that the youth hurled the egg while raising slogans against the party.
The young man, who identified himself as Saif Zafri, was soon overpowered by Aam Aadmi Party activists and handed over to police.
Zafri, who identified himself as a member of the Mulayam Youth Brigade, said he belonged to Bijnor in Uttar Pradesh and had attacked Vishwas over his reported comments on islam.
Youth hurled the egg while raising slogans against the party.
"We will not be cowed down by such acts and our resolve to change the face of politics is stronger now," Vishwas told IANS.
He said that parties like the Bharatiya Janata Party, Samajwadi Party and and Congress were getting jittery following the AAP's success in Delhi.
He said the AAP will put up strong candidates against all major party leaders in the Lok Sabha polls.
The AAP leader, who plans to take on Congress vice president Rahul Gandhi in Amethi in the general election, will take out a road show in the constituency Sunday.