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Ramana123Ramana123 

Display list of accounts in a block with checkbox, if the user selects the accounts and click on "Show Contacts " button the selected account related contacts should display in the pageBlocktable beside the accounts list block

ANUTEJANUTEJ (Salesforce Developers) 
Hi Srikanth,

I found the below disucussion where it shows a similar implementation which you can modify according to your business requirement.

https://developer.salesforce.com/forums/?id=906F0000000DBmuIAG

Kindly let me know if this helps and please close the thread by marking a best answer so that it can be useful to others ans also it would help us in keeping the community clean.

Regards,
Anutej