How to perform batch update in Sql through C# code

Question

I want to update multiple rows like below

update mytable set s_id = {0} where id = {1}

(Here s_id is evaluated based on some

Answer 1

Create a set of those updates (with the id's filled in), separate them by semicolon in one string, set the resulting string to a SqlCommand's CommandText property, then call ExecuteNonQuery().