where in linq code example

Example 1: linq c# where condition

var query = MemberTable.Where(x=>x.sex.Equals(Sex))

if (members != null)
     query = query.Where(x=>members.Contains(x.membercode))

//use your query
query.ToList();

Example 2: linq c# or

filteredTasks = filteredTasks.Where(p => p.TaskStateID == 10 || 
                                         p.TaskStateID == 11 || 
                                         p.TaskStateID == 12);