File sharing lock count exceeded. Increase maxlocksperfile registry entry

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VS2010

Hi.. i am using VB.net code and access DB. In my application i am doing some major table structure level changes through vb.net code. while doing this i am getting error

File sharing lock count exceeded. Increase MaxLocksPerFile registry entry

Access DB file version is 2000.
using vb.net(desktop application), vs10, access

What I have tried:

I have gone through this[^]
but i cannot do this activity at all end user's PC. So please help me to solve this at code level.

sample code

sSql = "ALTER TABLE tblTimeRegister ALTER COLUMN STATUS longtext"
            If Common.con1.State <> ConnectionState.Open Then
                Common.con1.Open()
            End If
            Dim cmd As OleDbCommand
            cmd = New OleDbCommand(sSql, Common.con1)            
            cmd.ExecuteNonQuery()

            If Common.con1.State <> ConnectionState.Closed Then
                Common.con1.Close()
            End If

note: this is just a one part of code... there are so many ADD COLUMN and ALTER COLUMN

Posted 19-Jul-19 19:44pm

Nitin Surya

Updated 19-Jul-19 20:01pm

v2

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OriginalGriff · Answer 1 · 2019-07-19T20:01:00

At a guess - and that's all it can be, we don't have access to your full code, or to your DB - you've opened so many Commands and so forth that you have exceeded the systems lock count, possibly combined with accessing the same Access file from too many users simultaneously.

To fix the former, use Using blocks around your Command constructors to automatically Close and Dispose them when you are finished.
To fix the latter, don't use Access as a multi-user database, it always gives problems which are a PITA to fix.