Hi all, in mfc dialog based application i have the following function. void Reverse() { // TODO: Add your control notification handler code here int nIndex, nStrLength, nWordIndex; TCHAR *pStrWord, *pStrFinal, ch; UpdateData(TRUE); nStrLength = m_strInput.GetLength(); pStrWord = new TCHAR [nStrLength + 1]; pStrFinal = new TCHAR [nStrLength + 1]; *pStrWord = '\0'; *pStrFinal = '\0'; nWordIndex = 0; for (nIndex = 0;nIndex < nStrLength; nIndex++) { ch = m_strInput.GetAt(nIndex); if ( ch != ' ' || nIndex == nStrLength ) { pStrWord[nWordIndex] = m_strInput.GetAt(nIndex); nWordIndex++; } if ( ch == ' ' ) { pStrWord[nWordIndex++] = ' '; pStrWord[nWordIndex] = '\0'; _tcscat(pStrFinal,_tcsrev(pStrWord)); nWordIndex=0; } if ( nIndex == (nStrLength - 1) ) { pStrWord[nWordIndex++] = ' '; pStrWord[nWordIndex] = '\0'; _tcscat(pStrFinal,_tcsrev(pStrWord)); nWordIndex = 0; } } pStrFinal = _tcsrev(pStrFinal); pStrFinal[nStrLength] = '\0'; m_strOutput = pStrFinal; UpdateData(FALSE); delete [] pStrWord; delete [] pStrFinal; } I get error when deleting pStrFinal could anyone tell me why this happens. can any one of you explain me how to dump memory and to verify it.