title: Error after deleting an argument (the "method arguments" error)
body: <p>I have built a class called "MemoryDB" (whose c'tor takes 6 arguments) and created unit-test for her.
  Everything was OK until today - I tried deleting one of the arguments, so they remain 5. Even though (after re-building, saving, re-creating the class MemoryDB, etc.), the unit-test does not recognize the change and the error message appears: <code>TimeTable.DB.MemoryDB does not contain a constructor that takes 5 arguments.</code>
  I also tried to re-create the unit-test, but for some reason the automatic c'tor it creates is the old c'tor, with 6 arguments.</p>
  
  <p>Have I deleted the argument in a wrong way? How can I fix this? Do other errors in the project might cause this weird problem?</p>
  
  <p>p.s. here is the old c'tor:</p>
  
  <pre><code>    public MemoryDB(List&lt;Grade&gt; allGrades, List&lt;Teacher&gt; allTeachers, ForbiddenHours forbiddenHours, List&lt;Group&gt; allGroups, List&lt;List&lt;Teacher&gt;&gt; staffs, List&lt;List&lt;Group&gt;&gt; parallelGroups)
      {
          CheckParametersValidation(allGrades, allTeachers, forbiddenHours, allGroups, staffs, parallelGroups);
  
          this.allGrades = allGrades;
          this.allTeachers = allTeachers;
          this.forbiddenHours = forbiddenHours;
          this.allGroups = allGroups;
          this.staffs = staffs;
          this.parallelGroups = parallelGroups;
      }
  </code></pre>
  
  <p>the new c'tor, after deleting "forbiddenHours":</p>
  
  <pre><code>    public MemoryDB(List&lt;Grade&gt; allGrades, List&lt;Teacher&gt; allTeachers, List&lt;Group&gt; allGroups, List&lt;List&lt;Teacher&gt;&gt; staffs, List&lt;List&lt;Group&gt;&gt; parallelGroups)
      {
          CheckParametersValidation(allGrades, allTeachers, allGroups, staffs, parallelGroups);
  
          this.allGrades = allGrades;
          this.allTeachers = allTeachers;
          this.allGroups = allGroups;
          this.staffs = staffs;
          this.parallelGroups = parallelGroups;
      }
  </code></pre>