ODBC - unable to allocate an environment handle - vb.net

Question

Hi I am trying to insert data into Navision database from a DataTable. That DataTable contain around 5000 records, if the records count is less then it's working fine but record count is around 5000 I am getting this error.
ERROR - unable to allocate an environment handle.
This is the code I am using
Public Function InsertToHHTTransferLine(ByVal dtTransferLn As DataTable, ByVal hhtNumber As String) As Integer
Dim result As Integer
Dim cn As OdbcConnection
Dim dtTransferLine As DataTable
cn = New OdbcConnection(ConnStr)
Dim SqlStr As String = ""
Try
cn.Open()
dtTransferLine = dtTransferLn
Dim DocType As String
DocType = "Purchase"
Dim cmd As OdbcCommand
Dim hhtNo As String
hhtNo = hhtNumber
If dtTransferLine.Rows.Count > 0 Then
For i As Integer = 0 To dtTransferLine.Rows.Count - 1
If dtTransferLine.Rows(i)("DOC_TYPE").ToString() = "0" Then
DocType = "Purchase"
End If
If dtTransferLine.Rows(i)("DOC_TYPE").ToString() = "1" Then
DocType = "Transfer Receipt"
End If
If dtTransferLine.Rows(i)("DOC_TYPE").ToString() = "2" Then
DocType = "Transfer Shipment"
End If
If dtTransferLine.Rows(i)("DOC_TYPE").ToString() = "3" Then
DocType = "Stock Count"
End If
Try
SqlStr = "INSERT INTO ""HHT & Navision Line""(""Document Type"",""Document No_"",""HHT No_"",""Line No_"",""Item No_"",""Document Quantity"",""Scan Quantity"",""Unit Price"",""Posted"") VALUES('" & DocType & "','" & dtTransferLine.Rows(i)("DOC_NO").ToString() & "','" & hhtNo & "','" & dtTransferLine.Rows(i)("LINE_NO").ToString() & "','" & dtTransferLine.Rows(i)("ITEM_NO").ToString() & "'," & dtTransferLine.Rows(i)("DOC_QTY").ToString() & "," & dtTransferLine.Rows(i)("SCAN_QTY").ToString() & "," & dtTransferLine.Rows(i)("UNIT_PRICE").ToString() & ",0)"
cmd = New OdbcCommand(SqlStr, cn)
result = cmd.ExecuteNonQuery()
Catch ex As Exception
If (ex.Message.IndexOf("Illegal duplicate key") <> -1) Then
CreateLog(SqlStr, "User1", "Duplicate()", ex.Message)
Else
CreateLog(SqlStr, "User1", "Other()", ex.Message)
End If
'CreateLog(SqlStr, "User1", "Other()", ex.Message)
End Try
Next
End If
Catch ex As Exception
CreateLog(SqlStr, "User1", "InsertToHHTTransferLine()", ex.Message)
result = -1
Finally
cn.Close()
cn.Dispose()
End Try
Return result
End Function

Answer 1

Could be that "cmd" variables need to be disposed before creating new ones?
At least this is the only thing I can see in the code where you are consuming resources in a loop depending on the number of records.
Anyway this should be easy to identify with a debugger, just figure out the line giving you the error, and that will lead you to the answer.