Check Connection From C# Application To SQL Server.

Jun 28, 2007

Hey anyone,

I got a problem to check a connection whether it is established or not from my C# Application to SQL Server.

I am developing my application which can run in 2 modes:

1. Online: There must be a connection to SQL Server to get new data updates.

2. Offline: I dont need a connection to SQL Server. I set a timer to tick every 5 seconds and it will check the connection with SQL Server and my problem here: (this is my code)1 public static bool checkConnection()
2 {
3 SqlConnection conn = new SqlConnection("mydatasource");
4 try
5 {
6 conn.Open();
7 return true;
8 }
9 catch (Exception ex) { return false; }
10 }


 Yes, it works but my application seems to wait about >3 seconds to get the return "False"; I tried to add "Connect TimeOut=1" in my Connection String, but the problem is still there.

I dont know whether there is a faster way to check the connection to SQL server which is established or not.

Thank you very much,

Joesy

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inline void _bstr_t::Data_t::_Free() throw()
{

if (m_wstr != NULL) {
::SysFreeString(m_wstr);
}
if (m_str != NULL) {

delete [] m_str;
}
}





This is being called from.



Code Snippet

inline void Command15::PutRefActiveConnection ( struct _Connection * ppvObject ) {

HRESULT _hr = putref_ActiveConnection(ppvObject);
if (FAILED(_hr)) _com_issue_errorex(_hr, this, __uuidof(this));
}





The exception that occurs: First-chance exception at ...: 0xC0000005: Access violation reading location 0xcccccccc.

Similarly when one instance releases a command using





Code Snippet
inline void Command15::PutRefActiveConnection ( struct _Connection * ppvObject ) {


HRESULT _hr = putref_ActiveConnection(ppvObject);
if (FAILED(_hr)) _com_issue_errorex(_hr, this, __uuidof(this));
}







The second instance of the application fails when running the command at the exact same time.



Code Snippet

inline _RecordsetPtr Command15::Execute ( VARIANT * RecordsAffected, VARIANT * Parameters, long Options ) {


struct _Recordset * _result = 0;
HRESULT _hr = raw_Execute(RecordsAffected, Parameters, Options, &_result);
if (FAILED(_hr)) _com_issue_errorex(_hr, this, __uuidof(this));
return _RecordsetPtr(_result, false);
}







The command and connections are not static and there should be completely seperate instances of these for each instance of the application. Does anybody know why this may be happening. Any help would be appreciated. Thanks in advance.

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