Inserting DateTime into datetime field TSQL - tsql

Question

I'm trying to call a stored procedure in SQL Server 2012 Express from a C# program, to insert a DateTime data type into a column (which is also datetime).
For some reason, I keep getting errors about "Conversation failed when converting date and/or time from character string."
I've checked the culture settings in my SQL server, which is set to us_english, but the datetime format is the ISO standard.
Here's the code from the stored procedure. The values are exactly how they're passed by the C# app.
USE testdb;
DECLARE #Name NVARCHAR(50) = 'Somename',
#Location NVARCHAR(50) = 'somelocation',
#Date DateTime = '2013-10-11 11:00:05.000'
BEGIN
SET NOCOUNT ON;
SELECT #Name, #Location, #Date
if exists (select name from ComputerHistory where name = #Name)
begin
DECLARE #Query1 NVARCHAR(MAX)
if #Location <> 'disconnected'
begin
set #Query1 = '
update ComputerHistory
set ' + #Location + ' = 1 + ISNULL((select MAX(' + #Location + ') from ComputerHistory where name = ''' + #Name + '''),0),
lastdateonline = ''' + #Date + '''
where name = ''' + #Name + '''
'
--EXEC sp_executesql #Query1
end
else
begin
set #Query1 = '
update ComputerHistory
set ' + #Location + ' = 1 + ISNULL((select MAX(' + #Location + ') from ComputerHistory where name = ''' + #Name + '''),0)
where name = ''' + #Name + '''
'
EXEC sp_executesql #Query1
end
end
else
begin
DECLARE #Query2 NVARCHAR(150)
set #Query2 = 'insert into ComputerHistory(name, ' + #Location + ') VALUES(''' + #Name + ''', ''1'')'
EXEC sp_executesql #Query2
end
END

Answer 1

Try cast(#Date as nvarchar(50))
set #Query1 = '
update ComputerHistory
set ' + #Location + ' = 1 + ISNULL((select MAX(' + #Location + ') from ComputerHistory where name = ''' + #Name + '''),0),
lastdateonline = ''' + cast(#Date as nvarchar(50)) + '''
where name = ''' + #Name + '''
'