C # Three methods to determine whether the field values taken out of the database are empty (NULL)

The recent operation of the database, you need to determine whether the returned field value is empty, collected on the Internet 3 ways for everyone to refer

1 through System.DBNull, most of the online use of this method.

Copy CodeThe code is as follows:
DataTable DT; Assuming the field is name, DT has saved the data
dt.rows[0]["name"] = = System.DBNull.Value; Determines whether the name field of the first row of data is empty

2 Judging by IsNull

Copy CodeThe code is as follows:
DataTable DT; Assuming the field is name, DT has saved the data
Dt.rows[0].   IsNull ("name"); Determines whether the name field of the first row of data is empty

3 Judging by ToString ()

Copy CodeThe code is as follows:
DataTable DT; Assuming the field is name, DT has saved the data
dt.rows[0]["Name"].   ToString () = = ""; Determine if the name field of the first row of data is empty address: http://www.jb51.net/article/35234.htm

C # Three methods to determine whether the field values taken out of the database are empty (NULL)