InvalidOperationException: Sequence contains no elements - asp.net-mvc

Question

I have written a code in .net using mvc and entity framework:
#{
List<DAL.Project> oldProjectList = new BL.ProjectLogic().getProjects(userName).Where(s => s.Status == "Not Active").ToList();
}
#foreach (DAL.Project p in oldProjectList)
{
{some code}
}
The first line of code should return a list of "Not Active" projects, and it actually works.
but it only works on users that have "Non Active" projects, other users get an exception in the foreach line saying:
[InvalidOperationException: Sequence contains no elements]
How to fix it?
Thanks

Answer 1

Are you sure that the exception is being thrown in your foreach? In this small reproducible example, I can't get the same error while executing:
using System;
using System.Collections.Generic;
using System.Linq;
namespace LinqPlayground
{
class Program
{
public class Project
{
public string Status { get; set; }
}
static void Main(string[] args)
{
var projects = GetProjects("test").Where(project => project.Status == "Not Active").ToList();
foreach (var project in projects)
{
Console.WriteLine(project.Status);
}
}
public static IEnumerable<Project> GetProjects(string userName)
{
return new List<Project>();
}
}
}

Answer 2

Use the first part of that line, but not the ToList().
Instead, save the result of the Where() in a var, and then check that VAR using. Any():
var temp = new BL.Proje s ctLogic().getProjects(userName)
.Where( => s.Status == "Not Active");
List<DAL.Project> oldProjectList =
temp.Any() ?
temp.ToList() :
new List<DAL.Project>() ;