How to insert null value in Database through parameterized query

Question

I have a datetime datatype : dttm

Also the database field type is datatime

Now I am doing this:

if (dt         


        

Answer 1

This can be done using the null-coalescing operator: if the value of dttm is null the DBNull.Value will be inserted otherwise the value of dttm will be used

cmd.Parameters.AddWithValue("@dtb", dttm ?? (object) DBNull.Value);

This will eliminate the need for the if statment