SQL Parameters: Add vs. AddWithValue

Question

I'm in the process of designing an application (Visual C# 2012) that will be working with a SQL database, and have been using parameters in my queries.
My question is if there is any advantages/disadvantages to using AddWithValue over Adding the paramater and then specifying the value and type in a separate instruction (in the C# code)?
I've read a few places that sometimes with AddWithValue, either the .Net framework or SQL doesn't always select the appropriate datatype for the parameter and can cause errors.  But on the other hand, using AddWithValue can reduce the number of lines
of code you have to write (some of my queries might have 10+ parameters, which is small compared to a database for a multi-site Enterprise database system) and thus make your code faster (hopefully).
Opinions as to whether to use Add + extra statements, or just use AddWithValue?

Answer 1

that sometimes with AddWithValue, either the .Net framework or SQL doesn't always select the appropriate datatype for the parameter and can cause errors. 
It's the other way round, see
SqlParameterCollection.AddWithValue
Method => Remarks:
"AddWithValuereplaces the
SqlParameterCollection.Add method
that takes a String and an
Object. The overload of
Add that takes a string and an object was deprecated because of possible ambiguity with the
SqlParameterCollection.Add overload that takes a
String and a
SqlDbType enumeration value where passing an integer with the string could be interpreted as being either the parameter value or the corresponding
SqlDbType value. Use
AddWithValue whenever you want to add a parameter by specifying its name and value."
Olaf Helper
[ Blog] [ Xing] [ MVP]