Question

This might be a Windows 7 issue, but calling

using (var context = new DataClassesDataContext())
{
    if (!context.DatabaseExists())
    {
        context.CreateDatabase();
    }
}

Results in the following error:

System.Data.SqlClient.SqlException was
unhandled Message=Database
‘C:\Temp\SmallBusinessManager.mdf’
already exists. Choose a different
database name. Source=.Net SqlClient
Data Provider ErrorCode=-2146232060
Class=16 LineNumber=1 Number=1801
Procedure=””
Server=\.\pipe\952FCA9D-B4B6-4C\tsql\query
State=3 StackTrace:
at System.Data.SqlClient.SqlConnection.OnError(SqlException
exception, Boolean breakConnection)
at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException
exception, Boolean breakConnection)
at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning()
at System.Data.SqlClient.TdsParser.Run(RunBehavior
runBehavior, SqlCommand cmdHandler,
SqlDataReader dataStream,
BulkCopySimpleResultSet
bulkCopyHandler, TdsParserStateObject
stateObj)
at System.Data.SqlClient.SqlCommand.RunExecuteNonQueryTds(String
methodName, Boolean async)
at System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(DbAsyncResult
result, String methodName, Boolean
sendToPipe)
at System.Data.SqlClient.SqlCommand.ExecuteNonQuery()
at System.Data.Linq.SqlClient.SqlProvider.ExecuteCommand(String
command)
at System.Data.Linq.SqlClient.SqlProvider.System.Data.Linq.Provider.IProvider.CreateDatabase()
at System.Data.Linq.DataContext.CreateDatabase()

However I’ve deleted the database files. What could be causing this? Are the files really there but invisible somehow? Something to do with junctions?

Answer 1

Grab Process Monitor and you’ll be able to see the file io operations and why they fail. I find that this is often the best and quickest way to get to the root of the problem. It’s an excellent utility.