I'm having problems with adding a BLOB to my database

Question

I get a error (
An unhandled exception of type 'Oracle.DataAccess.Client.OracleException' occurred in system.data.dll
Additional information: System error. )
on the last line of the code
I'm coding it is Visual Basic .net
can some one tell me what is causing the error or can any one till me how to find out more on the error message.
table schema
CREATE TABLE "CWMS"."LOCAL_FILE_BLOBS" (
     "CWMS_ID_UC" VARCHAR2(16) NOT NULL,
     "FILE_TYPE" VARCHAR2(16) NOT NULL ,
     "DISPLAY_ORDER" NUMBER(10, 2) NOT NULL,
     "FILE_TEXT_DES" VARCHAR2(255) NOT NULL,
     "ORG_FILE_NAME" VARCHAR2(255) NOT NULL,
     "DATE_TIME" DATE,
     "FILE_DATA" BLOB,
PRIMARY KEY("CWMS_ID_UC", "FILE_TYPE","DISPLAY_ORDER","ORG_FILE_NAME"))
TABLESPACE "FILEBLOB"
source code
Public Function UpdateBlob(ByVal CWMS_ID As String, ByVal ORG_FILE_NAME As String, ByVal DISPLAY_ORDER As Integer, ByVal DATE_TIME As DateTime, ByVal fs As System.IO.Stream)
'To fill DataSet and update datasource
Dim printmediaAdapter As Oracle.DataAccess.Client.OracleDataAdapter
'In-memory cache of data
Dim printmediaDataSet As DataSet
''Data Row contained in Data Table
Dim printmediaRow As DataRow
''For automatically generating commands to make changes to database through DataSet
Dim printmediaCmdBldr As Oracle.DataAccess.Client.OracleCommandBuilder
printmediaAdapter = New Oracle.DataAccess.Client.OracleDataAdapter("SELECT CWMS_ID_UC, DISPLAY_ORDER, FILE_TYPE, ORG_FILE_NAME, FILE_DATA FROM LOCAL_FILE_BLOBS", conn)
'Instantiate a DataSet object
printmediaDataSet = New DataSet("LOCAL_FILE_BLOBS")
'Step 2.'     
'AddWithKey sets the Primary Key information to complete the
'schema information
printmediaAdapter.MissingSchemaAction = MissingSchemaAction.AddWithKey
'Configures the schema to match with Data Source
printmediaAdapter.FillSchema(printmediaDataSet, SchemaType.Source, "LOCAL_FILE_BLOBS")
'Step 3.'
'In this case 'OracleCommandBuilder' automatically generates
''SelectCommand'
printmediaCmdBldr = New Oracle.DataAccess.Client.OracleCommandBuilder(printmediaAdapter)
'Step 4.'
'Adapter fills the DataSet with 'PrintMedia' data
printmediaAdapter.Fill(printmediaDataSet, "LOCAL_FILE_BLOBS")
'Step 5.'
'Create a new row in the DataTable contained in the DataSet
printmediaRow = printmediaDataSet.Tables("LOCAL_FILE_BLOBS").NewRow()
'part of Step 7.'
'Assigning the value of advertisement text
printmediaRow("DISPLAY_ORDER") = DISPLAY_ORDER
Dim temp As String
temp = ORG_FILE_NAME
temp = StrReverse(temp)
temp = StrReverse(temp.Substring(0, temp.IndexOf(".")))
printmediaRow("CWMS_ID_UC") = CWMS_ID
printmediaRow("FILE_TYPE") = temp
printmediaRow("ORG_FILE_NAME") = ORG_FILE_NAME
'If image is added
'Step 6.'
'providing read access to the file chosen using the 'Browse' button
'Create a byte array of file stream length
Dim adImageData(fs.Length) As Byte
'Read block of bytes from stream into the byte array
fs.Read(adImageData, 0, System.Convert.ToInt32(fs.Length))
'Close the File Stream
fs.Close()
printmediaRow("FILE_DATA") = adImageData
'Step 8.'
'Adding the 'printmediaRow' to the DataSet
printmediaDataSet.Tables("LOCAL_FILE_BLOBS").Rows.Add(printmediaRow)
'Step 9.'
'Update the database table 'PrintMedia' with new printmedia rows
printmediaAdapter.Update(printmediaDataSet, "LOCAL_FILE_BLOBS")
End Function

Answer 1

Have you try the same code on a different clean machine (system.data.dll failing, it might be .net framework mismatch)?
Where exactly is the code failing (which line is throwing the exception?)
It is only failing with a blob?
Arnold