how to update primary key which is auto inrement in sql

You have to run, please read the documentation

 

https://docs.microsoft.com/en-us/sql/t-sql/database-console-commands/dbcc-checkident-transact-sql?view=sql-server-ver15 

when run this in ms-sql query

 

DBCC CHECKIDENT('tableName', RESEED, NEW_RESEED_VALUE)

DBCC CHECKIDENT('EnrollmentForm', 10158, 99999)

 

 

Msg 2560, Level 16, State 9, Line 1

If you will read my previous answer carefully then you could get the solution. By the way you can also read and follow the answer available at the below link.

 

https://stackoverflow.com/questions/19155775/how-to-update-identity-column-in-sql-server 

Turn off the identity column by editing the table definition after opening in the design mode. After updating the value you can change it again into the identity column.

 

Alternativel, you can delete the existing record and enable the identity insert and insert the new record for the desired column values as shown below. 

You can also reset the identity column values by the new one as shown below.

One thing you need to remember even after removing the identity column you need to insert / update with the unique value as you have said your column ins the primary key which does not accept the duplicate values in any case.