Unable to upload picture when sending as Base64 String topic

I am trying to send an image to our asp.net webservice from android.Here is my sample code :

// Getting image from Gallery

Code:

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Uri selectedImage = data.getData();
String[] filePathColumn = { MediaStore.Images.Media.DATA };

Cursor cursor = getContentResolver().query(selectedImage,
                                        filePathColumn, null, null, null);
cursor.moveToFirst();

int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
picturePath = cursor.getString(columnIndex);

cursor.close();

/*        BitmapFactory.Options options = new BitmapFactory.Options();
options.inSampleSize = 4;*/

thumbnail = (BitmapFactory.decodeFile(picturePath));
img_photo.setImageBitmap(thumbnail);

---

// converting imag into base64 string

Code:

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img_photo.buildDrawingCache();
                Bitmap bm = img_photo.getDrawingCache();
               
                ByteArrayOutputStream baos = new ByteArrayOutputStream();
                bm.compress(Bitmap.CompressFormat.PNG, 100, baos); // bm is the bitmap
                                                                                                                       
                byte[] photo = baos.toByteArray();
                System.out.println("this is byte array" + bytearray);
               
                String temp_base =Base64.encodeToString(photo,Base64.NO_WRAP);

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// calling webservice

Code:

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SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME);

request.addProperty("CarID", SellCarDetailView.sellcardetails_carid);
request.addProperty("pic",temp_base);
                System.out.println("this is piccontent" +temp_base);
try {

                        SoapSerializationEnvelope soapEnvelope = new SoapSerializationEnvelope(
                                        SoapEnvelope.VER11);
soapEnvelope.encodingStyle = SoapEnvelope.ENC;
                        // new MarshalBase64().register(soapEnvelope);
                        soapEnvelope.dotNet = true;
                        soapEnvelope.setOutputSoapObject(request);
                        HttpTransportSE aht = new HttpTransportSE(URL);
                        //AndroidHttpTransport aht = new AndroidHttpTransport(URL);
                        aht.call(SOAP_ACTION, soapEnvelope);

                        // SoapObject response = (SoapObject)envelope.getResponse();
                        SoapPrimitive response = (SoapPrimitive) soapEnvelope.getResponse();
                        String temp3 = response.toString();
               
                        Log.v("TAG", temp3);
                       
                } catch (Exception e) {
                        e.printStackTrace();
                }

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How ever i am getting "invalid parameter" at web service end.

// Asp.net code

Code:

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[ScriptMethod(UseHttpGet = false, ResponseFormat = ResponseFormat.Xml)]
[WebMethod(EnableSession = true)]
public string UploadPictureByCarIDFromAndroid(string CarID, string make, string model, string year, string UserID, string pic, string AuthenticationID, string CustomerID, string SessionID)
{
   
    string bStatus = "Failed";
    MobileBL objMobile = new MobileBL();
    UsedCarsInfo objCarPicInfo = new UsedCarsInfo();
   
    try
    {
                  try
            {
                if (AuthenticationID == ConfigurationManager.AppSettings["AppleID"].ToString())
                {
                    objCarPicInfo.Carid = Convert.ToInt32(CarID);
                    byte[] picContent = Convert.FromBase64String(pic);
                    // byte[] picContent = Base64.decode(pic);
                    MemoryStream ms = new MemoryStream(picContent, 0,picContent.Length); // getting "invalid length"
                    ms.Write(picContent, 0, picContent.Length);
                    Bitmap oBitmap1 = new Bitmap(ms);// getting "invalid length" error here
                    // System.Drawing.Image image = System.Drawing.Image.FromStream(ms, true);
                   
                   
                   
                   
                }
            }
            catch (Exception ex)
            {
               
            }
       
    }
    catch (Exception ex)
    {
    }
   
   
    return bStatus;
}

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I am getting "invalid length" error when sending the image.Any help is highly appreciated.