VB.NET Database Oracle ส่งค่า Parameters.AddWithValue Add ค่ามาใส่ไม่ได้ครับ

            '*** Insert to Database ***'
            Dim objConn As New OracleConnection
            Dim strConnString, strSQL As String

			strConnString = "Data Source=TCDB;User Id=myuser;Password=mypassword;"

            strSQL = "INSERT INTO files (Name,FilesName,FilesType) " & _
            " VALUES " & _
            " (:sName,:sFilesName,:sFilesType)"
            objConn.ConnectionString = strConnString
            objConn.Open()

            Dim objCmd As New OracleCommand(strSQL, objConn)
            objCmd.Parameters.Add(":sName", OracleType.VarChar).Value = Me.txtName.Text
            objCmd.Parameters.Add(":sFilesName", OracleType.Blob).Value = imbByte
            objCmd.Parameters.Add(":sFilesType", OracleType.VarChar).Value = strMIME
            objCmd.ExecuteNonQuery()

            objConn.Close()
            objConn = Nothing