Q:

IN query using LINQ for IEnumerable List of items

Struggling to get this right. 
So I have a model view which has the Ienumerable BusinessUnits to bind a ListBox multiselect for the view and I have the Ienumerable selectedBusinessUnit to hold the selected values. 
Once the multiple values are selected and postback to the controller I am struggling to use linq query to check values in database against the IEnumberable selectedBusinessUnit. More like a SQL "IN" query. 
Code below
public class ProjectsSearchViewModel
    {
        public IEnumerable<string> selectedBusinessUnit { get; set; }  //Selected Revenue Organization (Business Unit)
        [Display(Name = "Business Unit")]
        public IEnumerable<SelectListItem> BusinessUnits { get; set; } //populate list of business units from database for the listbox
    }

// My View
@Html.LabelFor(m => m.BusinessUnits, new { @class = "col-md-4 control-label" })
@Html.ListBoxFor(m => m.selectedBusinessUnit, Model.BusinessUnits, new { @class = "form-control", type = "dropdownlist", size = 5 })

// Controller
if (projectsSearchViewModel.selectedBusinessUnit != null)
                {                
                    result = result.Where(x => x.Project.Revenue_Organization.Contains(projectsSearchViewModel.selectedBusinessUnit));}

It says cannot convert IEnumerable to string
Has anyone managed to do something like this successfully. If so would be keen to know how. 
More code
 var results = (from project in db.Projects
         join emp in db.Employees
         on project.Project_Manager equals emp.Employee_ID
         select new ProjectsList
         {
             Project = project,
             Employee = emp
         });

Revenue_organization is one of the columns (property if you like) in the project table (project object) in case any one is wondering. 
so end result i am looking for to get list of projects where revenue_organization IN selected list of businessunits

A:

Assuming that Project.Revenue_Organization is a string you need to reverse the statement. The collection should contain the string but as you have it written its checking if the string contains the collection (which does not make sense).
result = result.Where(x => projectsSearchViewModel.selectedBusinessUnit.Contains(x.Project.Revenue_Organization));}

