--------------------
Here's the error text:

SqlException
 Implicit conversion from data type text to nvarchar is not allowed. Use the CONVERT function to run this query.

Source     : .Net SqlClient Data Provider

Stack Trace:
   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(TdsParserStateObject stateObj)
   at System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj)
   at System.Data.SqlClient.SqlDataReader.ConsumeMetaData()
   at System.Data.SqlClient.SqlDataReader.get_MetaData()
   at System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString)
   at System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async)
   at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, DbAsyncResult result)
   at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method)
   at System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method)
   at System.Data.SqlClient.SqlCommand.ExecuteDbDataReader(CommandBehavior behavior)
   at System.Data.Common.DbCommand.System.Data.IDbCommand.ExecuteReader(CommandBehavior behavior)
   at System.Data.Common.DbDataAdapter.FillInternal(DataSet dataset, DataTable[] datatables, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior)
   at System.Data.Common.DbDataAdapter.Fill(DataTable[] dataTables, Int32 startRecord, Int32 maxRecords, IDbCommand command, CommandBehavior behavior)
   at System.Data.Common.DbDataAdapter.Fill(DataTable dataTable)
   at MicroFour.StrataFrame.Data.DbDataSourceItem.GetDataTable(DbCommand Command, OnChangeEventHandler CallBack)
   at MicroFour.StrataFrame.Data.SqlDataSourceItem.GetDataTable(DbCommand Command, OnChangeEventHandler CallBack)
   at MicroFour.StrataFrame.Data.DataLayer.GetDataTable(DbCommand Command, Boolean RegisterNotification)
   at MicroFour.StrataFrame.Business.BusinessLayer.FillDataTable(DbCommand CommandToExecute)
   at MicroFour.StrataFrame.AddIns.DTEprojectsBO.FillProjects(String[] ProjectPaths)
   at MicroFour.StrataFrame.AddIns.PartialClassBuilderDialog.BuildProjectNode(PartialClassBuilderVSProject Prj)
   at MicroFour.StrataFrame.AddIns.PartialClassBuilderDialog.BuildTreeView()
   at MicroFour.StrataFrame.AddIns.PartialClassBuilderDialog.InitForm()

I'm not sure if it comes with Visual Studio or not, but there is a SQL Server Express Manager that you can download for free from Microsoft.  And, if you have an MSDN subscription (which chances are good you do with the way Microsoft has been pushing VS2005 to its customers), you can download the SQL Server 2005 tools containing SQL Server Management Studio (the new replacement for Enterprise Manager).

SSMS is a WONDERFUL app, and is quite a good ways beyond the capabilities and ease of use of Enterprise Manager.  Not to mention that it works great with existing pre-2005 SQL Server machines. 

There's also some functionality within VS itself to open databases, build queries and such, but I don't use it much since I have the other tools.