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POAccessViolationException on service
 

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    <p>I have a service running, that is connected to a few clients. It has been up and running for weeks and this function is called many times every minute, I have a few catches in the different function, but this exception made it all the way to crash. I never seen the issue before. Whan can make this occure? </p> <p>Stack:</p> <pre><code>Framework Version: v4.0.30319 Description: The process was terminated due to an unhandled exception. Exception Info: System.AccessViolationException Stack: at System.Data.OleDb.OleDbServicesWrapper.GetDataSource(System.Data.OleDb.OleDbConnectionString, System.Data.OleDb.DataSourceWrapper ByRef) at System.Data.OleDb.OleDbConnectionInternal..ctor(System.Data.OleDb.OleDbConnectionString, System.Data.OleDb.OleDbConnection) at System.Data.OleDb.OleDbConnectionFactory.CreateConnection(System.Data.Common.DbConnectionOptions, System.Object, System.Data.ProviderBase.DbConnectionPool, System.Data.Common.DbConnection) at System.Data.ProviderBase.DbConnectionFactory.CreateNonPooledConnection(System.Data.Common.DbConnection, System.Data.ProviderBase.DbConnectionPoolGroup) at System.Data.ProviderBase.DbConnectionFactory.GetConnection(System.Data.Common.DbConnection) at System.Data.ProviderBase.DbConnectionClosed.OpenConnection(System.Data.Common.DbConnection, System.Data.ProviderBase.DbConnectionFactory) at System.Data.OleDb.OleDbConnection.Open() at EServer.Database.DBManager.DoesObjectExsist(System.String) at EServer.Database.DBManager.setObjectOnline(System.String, Boolean, System.String, System.String) at EServer.Network.SocketListener.handleToDo() at EServer.Network.Token.ProcessData(System.Net.Sockets.SocketAsyncEventArgs) at EServer.Network.SocketListener.ProcessReceive(System.Net.Sockets.SocketAsyncEventArgs) at EServer.Network.SocketListener.OnIOCompleted(System.Object, System.Net.Sockets.SocketAsyncEventArgs) at System.Net.Sockets.SocketAsyncEventArgs.OnCompleted(System.Net.Sockets.SocketAsyncEventArgs) at System.Net.Sockets.SocketAsyncEventArgs.ExecutionCallback(System.Object) at System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean) at System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object) at System.Net.Sockets.SocketAsyncEventArgs.FinishOperationSuccess(System.Net.Sockets.SocketError, Int32, System.Net.Sockets.SocketFlags) at System.Net.Sockets.SocketAsyncEventArgs.CompletionPortCallback(UInt32, UInt32, System.Threading.NativeOverlapped*) at System.Threading._IOCompletionCallback.PerformIOCompletionCallback(UInt32, UInt32, System.Threading.NativeOverlapped*) </code></pre> <p>Code:</p> <pre><code>public bool DoesObjectExsist(String ID) { try { String connectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source='" + dbPath + "'"; string mySelectQuery = "SELECT * FROM Object WHERE ID = \"" + ID + "\""; OleDbConnection myConnection = new OleDbConnection(connectionString); OleDbCommand myCommand = new OleDbCommand(mySelectQuery, myConnection); myConnection.Open(); OleDbDataReader myReader = myCommand.ExecuteReader(); try { while (myReader.Read()) { return true; } } finally { myReader.Close(); myConnection.Close(); } return false; } catch (Exception e) { return false; } } </code></pre>
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    1. COUsing an Access database in a multi-user service scenario is very unwise. It just isn't bullet-proof enough for such an application. You'll need help from Microsoft Support to find a solution, they'll need at least a minidump to work from. But high odds they'll just tell you to stop doing this because they won't support it. Consider at least SQL Server Express as a substitute.
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