OLEDB CONNECTION IN VC++

COledb_connectView.h
public:
COledb_connectDoc* GetDocument();
bool flag;



COledb_connectView.cpp
void COledb_connectView::OnInitialUpdate()
{
m_pSet = &GetDocument()->m_oledb_connectSet;
{
CWaitCursor wait;
HRESULT hr = m_pSet->Open();
if (hr != S_OK)
{
AfxMessageBox(_T("Record set failed to open."), MB_OK);
// Disable the Next and Previous record commands,
// since attempting to change the current record without an
// open RecordSet will cause a crash.
m_bOnFirstRecord = TRUE;
m_bOnLastRecord = TRUE;
}
}
m_rollno=m_pSet->m_rollno;
m_marks=m_pSet->m_marks;
COleDBRecordView::OnInitialUpdate();

}
void COledb_connectView::Onfirst()
{
// TODO: Add your control notification handler code here
UpdateData();
m_pSet->MoveFirst();
m_rollno=m_pSet->m_rollno;
m_marks=m_pSet->m_marks;

UpdateData(false);
}

void COledb_connectView::Onlast()
{
// TODO: Add your control notification handler code here
UpdateData();
m_pSet->MoveLast();
m_rollno=m_pSet->m_rollno;
m_marks=m_pSet->m_marks;
UpdateData(false);

}

void COledb_connectView::Oninsert()
{
// TODO: Add your control notification handler code here
UpdateData();
m_rollno=0;
m_marks=0;
UpdateData(false);
}

void COledb_connectView::Onsave()
{
// TODO: Add your control notification handler code here
UpdateData();
m_pSet->m_rollno=m_rollno;
m_pSet->m_marks=m_marks;
if(flag==true)//if flag is true then update operation will perform
{

m_pSet->SetData();
}
else //if flag is true then INSERT operation will perform
{
m_pSet->Insert();
}
flag=false;

UpdateData(false);
}

void COledb_connectView::Onnext()
{
// TODO: Add your control notification handler code here
UpdateData();
m_pSet->MoveNext();
m_rollno=m_pSet->m_rollno;
m_marks=m_pSet->m_marks;

UpdateData(false);
}

void COledb_connectView::Onprevious()
{
// TODO: Add your control notification handler code here
UpdateData();
m_pSet->MovePrev();
m_rollno=m_pSet->m_rollno;
m_marks=m_pSet->m_marks;

UpdateData(false);
}

void COledb_connectView::Onupdate()
{
// TODO: Add your control notification handler code here
UpdateData();
m_pSet->m_rollno=m_rollno;
m_pSet->m_marks=m_marks;
m_pSet->Update();
flag=true;
UpdateData(false);
}

void COledb_connectView::Ondelete()
{
// TODO: Add your control notification handler code here
UpdateData();
m_pSet->Delete();
m_pSet->MoveFirst();

m_rollno=m_pSet->m_rollno;
m_marks=m_pSet->m_marks;
UpdateData(false);

}