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PinnedThe C++ / CLI is for managed and mixed-mode C++ programming only Pin
Chris Maunder9-Jan-06 10:36
cofounderChris Maunder9-Jan-06 10:36 
QuestionHeap Corruption in richedit Pin
ForNow15-Jan-23 13:49
ForNow15-Jan-23 13:49 
AnswerRe: Heap Corruption in richedit Pin
Victor Nijegorodov15-Jan-23 21:26
Victor Nijegorodov15-Jan-23 21:26 
GeneralRe: Heap Corruption in richedit Pin
ForNow16-Jan-23 1:10
ForNow16-Jan-23 1:10 
Questiontrying to understand DLL and Thread local storage Pin
ForNow4-Dec-22 9:52
ForNow4-Dec-22 9:52 
AnswerRe: trying to understand DLL and Thread local storage Pin
Richard Deeming4-Dec-22 22:42
mveRichard Deeming4-Dec-22 22:42 
GeneralRe: trying to understand DLL and Thread local storage Pin
ForNow5-Dec-22 3:40
ForNow5-Dec-22 3:40 
GeneralRe: trying to understand DLL and Thread local storage Pin
Richard Deeming5-Dec-22 5:29
mveRichard Deeming5-Dec-22 5:29 
GeneralRe: trying to understand DLL and Thread local storage Pin
ForNow5-Dec-22 5:41
ForNow5-Dec-22 5:41 
GeneralRe: trying to understand DLL and Thread local storage Pin
Richard Deeming5-Dec-22 7:01
mveRichard Deeming5-Dec-22 7:01 
GeneralRe: trying to understand DLL and Thread local storage Pin
ForNow5-Dec-22 8:39
ForNow5-Dec-22 8:39 
AnswerRe: trying to understand DLL and Thread local storage Pin
Richard MacCutchan5-Dec-22 6:56
mveRichard MacCutchan5-Dec-22 6:56 
GeneralRe: trying to understand DLL and Thread local storage Pin
ForNow5-Dec-22 8:33
ForNow5-Dec-22 8:33 
GeneralRe: trying to understand DLL and Thread local storage Pin
Richard MacCutchan5-Dec-22 8:54
mveRichard MacCutchan5-Dec-22 8:54 
GeneralRe: trying to understand DLL and Thread local storage Pin
ForNow5-Dec-22 9:00
ForNow5-Dec-22 9:00 
AnswerRe: trying to understand DLL and Thread local storage Pin
jschell5-Dec-22 7:06
jschell5-Dec-22 7:06 
GeneralRe: trying to understand DLL and Thread local storage Pin
ForNow5-Dec-22 8:37
ForNow5-Dec-22 8:37 
GeneralRe: trying to understand DLL and Thread local storage Pin
jschell12-Dec-22 11:21
jschell12-Dec-22 11:21 
NewsGood news, /clr builds will soon add C++ 20 support! Pin
John Schroedl15-Nov-22 6:49
professionalJohn Schroedl15-Nov-22 6:49 
Questionrekursif Pin
Achmad Roihan28-Oct-22 3:31
Achmad Roihan28-Oct-22 3:31 
AnswerRe: rekursif Pin
OriginalGriff28-Oct-22 3:38
mveOriginalGriff28-Oct-22 3:38 
Questionrekursif program (Recursive Program) Pin
Achmad Roihan26-Oct-22 20:51
Achmad Roihan26-Oct-22 20:51 
AnswerRe: rekursif program (Recursive Program) Pin
OriginalGriff26-Oct-22 21:02
mveOriginalGriff26-Oct-22 21:02 
QuestionHow to close & clear the oledbconnection on form2()_load? Pin
Paramu19739-Oct-22 15:10
Paramu19739-Oct-22 15:10 
Hi,
I am using vs-2015. Managed C++/Cli Windows Forms Applications. I have Form1-MdiContainer & Form2. From Form1_Button_Click() accessing Form2.
In Form2_Load() I have OLEDBConnection. For When I press Form1-Button_Click(),
First time it's working good. Also when I re-click() the same Form1-Button()
the whole application is getting closed. I analysed that when I close the OLEDBConnection, the whole program is also getting closed. And the same code working good in c#. I can't understand my mistakes..! Thanks.

Note:- For First time when I click the Form1-Button no problem it's working good. But for re-click() whole application is getting closed().
Thanks Again

My Codes
Form1-MdiContainer()
private: System::Void button1_Click(System::Object^  sender, System::EventArgs^  e) {
    Form2^ MyStForm = Form2::GetForm(true, this);
    MyStForm->MdiParent = this;
    MyStForm->FormBorderStyle = System::Windows::Forms::FormBorderStyle::None;
    MyStForm->Dock = DockStyle::Fill;
    MyStForm->Show();
}
Form2-Top side
    public ref class Form2 : public System::Windows::Forms::Form
    {
        public: static Form2^ Form2::_instance = nullptr;
        public: static Form2^ Form2::GetForm(bool IsMDIChild, System::Windows::Forms::Form^ MyInstFrm) {
            if (_instance == nullptr)
                _instance = gcnew Form2();
            if (_instance->IsDisposed)
                _instance = gcnew Form2();
            if (IsMDIChild)
                _instance->MdiParent = MyInstFrm;
            return _instance;
        }
        blah..blah...blah...
         }

Form2-Load()
private: System::Void Form2_Load(System::Object^  sender, System::EventArgs^  e) {
    String^ MyStrConn = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + MyExcelFile + "; Extended Properties=\"Excel 12.0; HDR=YES; OLE DB Services=-1; \"";
    String^ MyExcelFile="C:\Students\Names.xlsx";
    String^ MyExcelSheet = "[Sheet1$]";
    String^ MySQLSelect = "select * from " + MyExcelSheet;
    System::Data::OleDb::OleDbConnection^ Cn1 = nullptr;
    Cn1 = gcnew System::Data::OleDb::OleDbConnection();
    Cn1->ConnectionString = MyStrConn;
    System::Data::OleDb::OleDbCommand^ MyCmd = nullptr;
    MyCmd = gcnew System::Data::OleDb::OleDbCommand();
    MyCmd->CommandText = MySQLSelect;
    MyCmd->Connection = Cn1;
    Cn1->Open();
        System::Data::OleDb::OleDbDataAdapter^ Da1 = gcnew System::Data::OleDb::OleDbDataAdapter(MyCmd);
        Da1->Fill(MyDataTable);
    Cn1->Close(); //????????????????? getting stuck
    if (Cn1 != nullptr){
        MyCmd->Cancel();
    }
    //Cn1->ConnectionString = nullptr;
    //Cn1->ReleaseObjectPool();
    MyCmd = nullptr;
    Cn1 = nullptr;

} 
Thanks
AnswerRe: How to close & clear the oledbconnection on form2()_load? Pin
Gerry Schmitz9-Oct-22 20:32
mveGerry Schmitz9-Oct-22 20:32 

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