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Posez votre questionpublic class machin { public void ConnectToSql () { System.Data.SqlClient.SqlConnection conn = new System.Data.SqlClient.SqlConnection (); conn.ConnectionString = "integrated security=SSPI;data source=SQL Server Name;" + "persist security info=False;initial catalog=northwind"; try { conn.Open(); } catch (Exception ex) { MessageBox.Show("Failed to connect to data source"); } finally { conn.Close(); } } }