Tak že upravil jsem podle toho příkladu a výsledek je

email cant send successfully under below reasons
Služba není k dispozici. Kanál přenosu bude uzavřen. Odpověď serveru: Cannot connect to SMTP server 77.75.76.48 (77.75.76.48:25), connect error 10060

tak že mi to nefunguje pořád
Output okno

'SendMail.vshost.exe' (CLR v4.0.30319: SendMail.vshost.exe): Loaded 'C:\WINDOWS\Microsoft.Net\assembly\GAC_32\mscorlib\v4.0_4.0.0.0__b77a5c561934e089\mscorlib.dll'. Symbols loaded.
'SendMail.vshost.exe' (CLR v4.0.30319: SendMail.vshost.exe): Loaded 'C:\WINDOWS\assembly\GAC_MSIL\Microsoft.VisualStudio.HostingProcess.Utilities\14.0.0.0__b03f5f7f11d50a3a\Microsoft.VisualStudio.HostingProcess.Utilities.dll'. Symbols loaded.
'SendMail.vshost.exe' (CLR v4.0.30319: SendMail.vshost.exe): Loaded 'C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\System.Windows.Forms\v4.0_4.0.0.0__b77a5c561934e089\System.Windows.Forms.dll'. Symbols loaded.
'SendMail.vshost.exe' (CLR v4.0.30319: SendMail.vshost.exe): Loaded 'C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\System\v4.0_4.0.0.0__b77a5c561934e089\System.dll'. Symbols loaded.
'SendMail.vshost.exe' (CLR v4.0.30319: SendMail.vshost.exe): Loaded 'C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\System.Drawing\v4.0_4.0.0.0__b03f5f7f11d50a3a\System.Drawing.dll'. Symbols loaded.
'SendMail.vshost.exe' (CLR v4.0.30319: SendMail.vshost.exe): Loaded 'C:\WINDOWS\assembly\GAC_MSIL\Microsoft.VisualStudio.HostingProcess.Utilities.Sync\14.0.0.0__b03f5f7f11d50a3a\Microsoft.VisualStudio.HostingProcess.Utilities.Sync.dll'. Symbols loaded.
'SendMail.vshost.exe' (CLR v4.0.30319: SendMail.vshost.exe): Loaded 'C:\WINDOWS\assembly\GAC_MSIL\Microsoft.VisualStudio.Debugger.Runtime\14.0.0.0__b03f5f7f11d50a3a\Microsoft.VisualStudio.Debugger.Runtime.dll'.
'SendMail.vshost.exe' (CLR v4.0.30319: SendMail.vshost.exe): Loaded 'C:\Users\xxxxxx\documents\visual studio 2015\Projects\SendMail\SendMail\bin\x86\Debug\SendMail.vshost.exe'. Symbols loaded.
'SendMail.vshost.exe' (CLR v4.0.30319: SendMail.vshost.exe): Loaded 'C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\System.Core\v4.0_4.0.0.0__b77a5c561934e089\System.Core.dll'. Symbols loaded.
'SendMail.vshost.exe' (CLR v4.0.30319: SendMail.vshost.exe): Loaded 'C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\System.Xml.Linq\v4.0_4.0.0.0__b77a5c561934e089\System.Xml.Linq.dll'. Symbols loaded.
'SendMail.vshost.exe' (CLR v4.0.30319: SendMail.vshost.exe): Loaded 'C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\System.Data.DataSetExtensions\v4.0_4.0.0.0__b77a5c561934e089\System.Data.DataSetExtensions.dll'. Symbols loaded.
'SendMail.vshost.exe' (CLR v4.0.30319: SendMail.vshost.exe): Loaded 'C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\Microsoft.CSharp\v4.0_4.0.0.0__b03f5f7f11d50a3a\Microsoft.CSharp.dll'. Symbols loaded.
'SendMail.vshost.exe' (CLR v4.0.30319: SendMail.vshost.exe): Loaded 'C:\WINDOWS\Microsoft.Net\assembly\GAC_32\System.Data\v4.0_4.0.0.0__b77a5c561934e089\System.Data.dll'. Symbols loaded.
'SendMail.vshost.exe' (CLR v4.0.30319: SendMail.vshost.exe): Loaded 'C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\System.Net.Http\v4.0_4.0.0.0__b03f5f7f11d50a3a\System.Net.Http.dll'. Symbols loaded.
'SendMail.vshost.exe' (CLR v4.0.30319: SendMail.vshost.exe): Loaded 'C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\System.Xml\v4.0_4.0.0.0__b77a5c561934e089\System.Xml.dll'. Symbols loaded.
The thread 0x2360 has exited with code 0 (0x0).
The thread 0x7bc has exited with code 0 (0x0).
'SendMail.vshost.exe' (CLR v4.0.30319: SendMail.vshost.exe): Loaded 'C:\Users\xxxxxx\documents\visual studio 2015\Projects\SendMail\SendMail\bin\x86\Debug\SendMail.exe'. Symbols loaded.
'SendMail.vshost.exe' (CLR v4.0.30319: SendMail.vshost.exe): Loaded 'C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\System.Configuration\v4.0_4.0.0.0__b03f5f7f11d50a3a\System.Configuration.dll'. Symbols loaded.
'SendMail.vshost.exe' (CLR v4.0.30319: SendMail.vshost.exe): Loaded 'C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\System.resources\v4.0_4.0.0.0_cs_b77a5c561934e089\System.resources.dll'. Module was built without symbols.
Exception thrown: 'System.Net.Mail.SmtpException' in System.dll
Exception thrown: 'System.Net.Mail.SmtpException' in System.dll
The thread 0x328c has exited with code 0 (0x0).
The thread 0x14f0 has exited with code 0 (0x0).
The program '[7564] SendMail.vshost.exe' has exited with code 0 (0x0).

takový výstup v Output okněi byl před úpravou po skončení programu díky