Basically Commands has Parameters and parameters has functions like Add, AddWithValue, and etc. In all tutorials i've seen, i usually noticed that they are using Add instead of AddWithValue. 

.Parameters.Add("@ID", SqlDbType.Int)

vs

.Parameters.AddWithValue("@ID", 1)

Is there a reason NOT to use AddWithValue? I'd prefer to use that over 

Parameters.Add("@ID", SqlDbType.Int, 4).Value = 1

since it saves my coding time. So which is better to use? Which is safe to use? Does it improves performance?

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