DateTime format to SQL format using C#

I am trying to save the current date time format from C# and convert it to an SQL Server date format like so yyyy-MM-dd HH:mm:ss so I can use it for my UPDATE query.

This was my first code:

DateTime myDateTime = DateTime.Now;
string sqlFormattedDate = myDateTime.Date.ToString("yyyy-MM-dd HH:mm:ss");

The output on date is okay, but time is always "12:00:00" so I changed my code to the following:

string sqlFormattedDate = myDateTime.Date.ToString("yyyy-MM-dd") + " " + 
myDateTime.TimeOfDay.ToString("HH:mm:ss");

It gave me this compile error:

FormatException was unhandled

And suggested I need to parse. So I tried doing this to my code as per my research here in StackOverflow:

string sqlFormattedDate = myDateTime.Date.ToString("yyyy-MM-dd") + " " + 
myDateTime.Parse.TimeOfDay.ToString("HH:mm:ss");

string sqlFormattedDate = myDateTime.Date.ToString("yyyy-MM-dd") + " " + 
myDateTime.tryParse.TimeOfDay.ToString("HH:mm:ss");

But it's telling me that it's a method which is not valid for given context. I tried searching for solutions to my problem and I have been stuck for two hours now. I'm still a bit new in C#, can you help me please?

try this below

DateTime myDateTime = DateTime.Now;
string sqlFormattedDate = myDateTime.ToString("yyyy-MM-dd HH:mm:ss.fff");

Using the standard datetime format "s" will also ensure internationalization compatibility (MM/dd versus dd/MM):

myDateTime.ToString("s");

=> 2013-12-31T00:00:00

Complete Options: (code: sample result)

d: 6/15/2008 
D: Sunday, June 15, 2008 
f: Sunday, June 15, 2008 9:15 PM 
F: Sunday, June 15, 2008 9:15:07 PM 
g: 6/15/2008 9:15 PM 
G: 6/15/2008 9:15:07 PM 
m: June 15 
o: 2008-06-15T21:15:07.0000000 
R: Sun, 15 Jun 2008 21:15:07 GMT 
s: 2008-06-15T21:15:07 
t: 9:15 PM 
T: 9:15:07 PM 
u: 2008-06-15 21:15:07Z 
U: Monday, June 16, 2008 4:15:07 AM 
y: June, 2008 

'h:mm:ss.ff t': 9:15:07.00 P 
'd MMM yyyy': 15 Jun 2008 
'HH:mm:ss.f': 21:15:07.0 
'dd MMM HH:mm:ss': 15 Jun 21:15:07 
'\Mon\t\h\: M': Month: 6 
'HH:mm:ss.ffffzzz': 21:15:07.0000-07:00

Supported in .NET Framework: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0
Reference: DateTime.ToString Method

DateTime format to SQL format using C#

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