Filter list using a dynamically created LINQ

I assume your user will enter Name=aa or ItemCode=bb etc in that format. In that case you would need to split the entry into it's 2 parts using something like this:-

string[] searchArray = txtNameSearch.Text.Split(new char[] { '=' });

you could then use a switch statement to call a method that takes a Predicate<> as a parameter and pass in a lambda expression when you call it, something like this:-

private void Filter(Predicate<myClass> filter)
       {
           List<myClass> filteredClassList = (from myclass in myClassList where filter(myclass) select myclass).ToList();
           dgMyClass.DataContext = filteredClassList;
       }

switch (searchArray[0])
           {
               case "Name":
                   Filter(myclass => myclass.Name.Contains(searchArray[1]) == true);
                   break;
               case "ItemCode":
                   Filter(myclass => myclass.ItemCode.Contains(searchArray[1]) == true);
                   break;
                   //etc
           }

I used a WPF form and DataGrid to test this but it would be the same for a WinForms project, just change DataContext to DataSource

Hope this helps