Initial commit

vscode/Chapter11/Ch11Ex02LinqQueries/Program.cs

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+using Packt.Shared; // Northwind, Customer
+
+using (Northwind db = new())
+{
+  IQueryable<string?> distinctCities =
+    db.Customers.Select(c => c.City).Distinct();
+
+  WriteLine("A list of cities that at least one customer resides in:");
+  WriteLine($"{string.Join(", ", distinctCities)}");
+  WriteLine();
+
+  Write("Enter the name of a city: ");
+  string city = ReadLine()!;
+
+  IQueryable<Customer> customersInCity = db.Customers.Where(c => c.City == city);
+
+  if (customersInCity is null)
+  {
+    WriteLine($"No customers found in {city}.");
+    return;
+  }
+
+  WriteLine($"There are {customersInCity.Count()} customers in {city}:");
+  foreach (Customer c in customersInCity)
+  {
+    WriteLine($"  {c.CompanyName}");
+  }
+}