LINQ to SQL in and not in

Question

What is in and not in equals in LINQ to SQL?

For example

select * from table in ( ...)
and 
select * from table not in (.         


        

Answer 1

I'm confused by your question. in and not in operate on fields in the query, yet you're not specifying a field in your example query. So it should be something like:

select * from table where fieldname in ('val1', 'val2')

or

select * from table where fieldname not in (1, 2)

The equivalent of those queries in LINQ to SQL would be something like this:

List validValues = new List() { "val1", "val2"};
var qry = from item in dataContext.TableName
          where validValues.Contains(item.FieldName)
          select item;

and this:

List validValues = new List() { 1, 2};
var qry = from item in dataContext.TableName
          where !validValues.Contains(item.FieldName)
          select item;