N
Neil
I'd like to know what the best method is for handling NULL (or 0)
values within a DropDownList.
If a database lookup value is optional I would normally consider
leaving it NULL but this leads to problems with DropDownLists because
there is no value to bind to and an eror is raised.
I considered a method whereby the DropDownList has a an index value of
0 inserted with a space character as the text after it has retrieved
the data from the source table. As it has a 0 index value it would
appear at the top of the list and would indicate that no selection had
been made. Within the database the column would be defined with a
default value of 0. Thus the 0 value retrieved from the db would bind
to the 0 value inserted into the DropDownList.
I've tried to get this approach to work but the code always errors
because there is no value to bind the retrieved db value against. I've
obviously not got the 0 value insertion code in the right place.
The web form is filling a formview control via a sqldatasource
following the selection of a record on a gridview.
Can someone point me in the right direction as to how such optional
lookup data in a dropdownlist should be handled
values within a DropDownList.
If a database lookup value is optional I would normally consider
leaving it NULL but this leads to problems with DropDownLists because
there is no value to bind to and an eror is raised.
I considered a method whereby the DropDownList has a an index value of
0 inserted with a space character as the text after it has retrieved
the data from the source table. As it has a 0 index value it would
appear at the top of the list and would indicate that no selection had
been made. Within the database the column would be defined with a
default value of 0. Thus the 0 value retrieved from the db would bind
to the 0 value inserted into the DropDownList.
I've tried to get this approach to work but the code always errors
because there is no value to bind the retrieved db value against. I've
obviously not got the 0 value insertion code in the right place.
The web form is filling a formview control via a sqldatasource
following the selection of a record on a gridview.
Can someone point me in the right direction as to how such optional
lookup data in a dropdownlist should be handled