1)My app call GetNextDataPart,i send all data(16k) ,and return ETrue
2)then app call ReleaseData,in this function i don't call NotifyNewRequestBodyPartL
3)I compute GetNextDataPart() sended data length,that equal with OverallDataSize return length。
4)result, data had send to server, but app don't run into MHFRunL,wait about 10 sec, app call OverallDataSize----Reset-----GetNextDataPart----ReleaseData, and wait again ,app will go through step 4)

I don't know why?