?ex.StackTrace
"at System.Data.SqlClient.SqlConnection.OnError()
at System.Data.SqlClient.SqlInternalConnection.OnError()
at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning()
at System.Data.SqlClient.TdsParser.Run()
at System.Data.SqlClient.TdsParser.Run()
at System.Data.SqlClient.SqlInternalConnection.Login()
at System.Data.SqlClient.SqlInternalConnection.OpenAndLogin()
at System.Data.SqlClient.SqlInternalConnection..ctor()
at System.Data.SqlClient.SqlConnection.Open()
at APC.APC.LoadDatabase()
at APC.APC.Button_Click()
at System.Windows.Forms.Control.OnClick()
at System.Windows.Forms.Button.OnClick()
at System.Windows.Forms.ButtonBase.WnProc()
at System.Windows.Forms.Control._InternalWnProc()
at Microsoft.AGL.Forms.EVL.EnterMainLoop()
at System.Windows.Forms.Application.Run()
at APC.APC.Main()
"