Mysterious Error With SQLBulkCopy

I have encountered a very frustrating situation when trying to use SQLBulkCopy.
I have two excel files that I am trying to import into two tables in an MSSQL Server 2005 Express DB. One excel file has 5,000 rows, while the other file has 500,000 rows.
I was able to import the smaller file successfully using this vb.net code:
 
 Protected Sub L26ExcelToSQL()

'Declare Variables
Dim sSQLTable As String = "Local26Members"
Dim sExcelFileName As String = "Full Local 26 List Formatted.xls"
Dim sWorkbook As String = "[Sheet1$]"

'Create connection strings
Dim sExcelConnectionString As String = "Provider=Microsoft.Jet.OLEDB.4.0;" & _
"Data Source=D:hostingmemberwolsite1l26voterreg" & sExcelFileName & ";" & _
"Extended Properties=""Excel 8.0;HDR=YES"""



Dim sSqlConnectionString As String = ConfigurationManager.ConnectionStrings("SiteSqlServer").ConnectionString.ToString

'Execute a query to erase any previous data from our destination table
Dim sClearSQL = "DELETE FROM " & sSQLTable
Dim SqlConn As SqlConnection = New SqlConnection(sSqlConnectionString)
Dim SqlCmd As SqlCommand = New SqlCommand(sClearSQL, SqlConn)
SqlConn.Open()
SqlCmd.ExecuteNonQuery()
SqlConn.Close()

'Series of commands to bulk copy data from the excel file into our SQL table
Dim OleDbConn As OleDbConnection = New OleDbConnection(sExcelConnectionString)
Dim OleDbCmd As OleDbCommand = New OleDbCommand(("SELECT * FROM " & sWorkbook), OleDbConn)

OleDbConn.Open()

Dim dr As OleDbDataReader = OleDbCmd.ExecuteReader()
Dim bulkCopy As SqlBulkCopy = New SqlBulkCopy(sSqlConnectionString)

bulkCopy.DestinationTableName = sSQLTable
bulkCopy.WriteToServer(dr)

OleDbConn.Close()
End Sub

 
 However, when I tried to import the 500,000 row excel file, I got the following error:
 

Server Error in '/L26' Application.

A
transport-level error has occurred when receiving results from the
server. (provider: TCP Provider, error: 0 - The specified network name
is no longer available.)



Description: An
unhandled exception occurred during the execution of the current web
request. Please review the stack trace for more information about the
error and where it originated in the code.



Exception Details: System.Data.SqlClient.SqlException:
A transport-level error has occurred when receiving results from the
server. (provider: TCP Provider, error: 0 - The specified network name
is no longer available.)



Source Error:






Line 438:
Line 439: bulkCopy.DestinationTableName = sSQLTable
Line 440: bulkCopy.WriteToServer(dr)
Line 441:
Line 442: OleDbConn.Close()








Source File: d:hostingmemberwolsite1L26DuesDefault2.aspx.vb    Line: 440




Stack Trace:






[SqlException (0x80131904): A transport-level error has occurred when receiving results from the server. (provider: TCP Provider, error: 0 - The specified network name is no longer available.)]
System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection) +925466
System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) +800118
System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj) +186
System.Data.SqlClient.TdsParserStateObject.ReadSniError(TdsParserStateObject stateObj, UInt32 error) +556
System.Data.SqlClient.TdsParserStateObject.ReadSni(DbAsyncResult asyncResult, TdsParserStateObject stateObj) +164
System.Data.SqlClient.TdsParserStateObject.ReadPacket(Int32 bytesExpected) +34
System.Data.SqlClient.TdsParserStateObject.ReadBuffer() +44
System.Data.SqlClient.TdsParserStateObject.ReadByte() +17
System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj) +79
System.Data.SqlClient.SqlBulkCopy.WriteToServerInternal() +1336
System.Data.SqlClient.SqlBulkCopy.WriteRowSourceToServer(Int32 columnCount) +916
System.Data.SqlClient.SqlBulkCopy.WriteToServer(IDataReader reader) +151
_Default.CSVToSQL() in d:hostingmemberwolsite1L26DuesDefault2.aspx.vb:440
_Default.ButtonTest3_Click(Object sender, EventArgs e) in d:hostingmemberwolsite1L26DuesDefault2.aspx.vb:905
System.Web.UI.WebControls.Button.OnClick(EventArgs e) +105
System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +107
System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +7
System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +11
System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +33
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1746











Version Information: Microsoft .NET Framework Version:2.0.50727.1433; ASP.NET Version:2.0.50727.1433
 After I received this error message, I tried viewing my database through the MSSQL Control Panel utilized by my hosting provider (WebHost4Life). However, I was unable to connect to the database and received this error:
 ___________________Microsoft OLE DB Provider for SQL Server error '80040e14'

Database 1496 cannot be autostarted during server shutdown or startup.

/getDBinfo.asp, line 29


_____________________ 
Now here is the most frustrating/mysterious part. I figured that maybe the error message were a result of the large size of the second excel file, so just for testing purposes, I created a new table in my MSSQL database. The table just has two fields, both set to varchar(50). I then created a test excel file, that had one row with the word "test" in the first and second column. When I tried using the code above to import the test excel data into the test table, I got the same exact error as I did with the 500,000 row file!
Please help, I'm really stumped and I am not sure when I am having so much trouble replicating the success I had the 5,000 row file.
Any suggestions are much apprecaited.
-Bryan