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class Program
{

public static void Main(string[] args)
{
Console.WriteLine("Bağlanmaya Çalışıyor..nBekleyiniz..");
ConnSingleton cs = ConnSingleton.getDbInstance();
cs.GetDBConnection();
Console.WriteLine("MSSQL Bağlantısı Gerçekleşti");
}


public class ConnSingleton
{
private static ConnSingleton dbInstance; //sistemde olan bir sql gir deneme için
private readonly SqlConnection conn = new SqlConnection("Data Source=DESKTOP-OHPLPDT\SQLEXPRESS;Initial Catalog=HastaneM;Integrated Security=true;");//Eger veri tabanı varsa basarılı yoksa hata verır

private ConnSingleton()
{
}

public static ConnSingleton getDbInstance() //burda sql dosyalarını tanıması için Istance methodu yazıyoruz erişilebilir olması için statıc yapıyoruz
{
if (dbInstance == null)
{
dbInstance = new ConnSingleton();
}
return dbInstance;
}

public SqlConnection GetDBConnection() //bu model de try carch ile bağlantı gercekleştirldi yada gercekleştirilmediyi control edceğiz
{
try
{
conn.Open();
Console.WriteLine("MSSQL Bağlantısı Gerçekleşti");//open yanı proje varsa gerçekleşti
}
catch (SqlException e)
{
Console.WriteLine("Bağlantı Gercekleştirilemedi : " + e.ToString());//eğer proje yok sa gerçekleşmedi diyip yazdırıyoruz
Console.ReadLine();
}
Console.ReadLine();
return conn;
}
}
     
 
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