Check out example codes for "c# mongodb update multiple fields". It will help you in understanding the concepts better.

Code Example 1

var update = Update.Set("Email", "[email protected]")
                    .Set("Phone", "4455512");

Code Example 2

var update = Update<Person>.
    Set(p => p.Email, "[email protected]").
    Set(p => p.Phone, "4455512");

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