Querying data using LINQ

Let's take a look at how we can use LINQ to query data in our applications. The following code snippet illustrates how you can use LINQ to display the contents of an array:

String[] employees = {"Joydip", "Douglas", "Jini", "Piku", "Amal",
                      "Rama", "Indronil"};
var employeeNames = from employee in employees select employee;
foreach (var empName in employeeNames)
    Response.Write(empName);

Now, let's discuss how to use LINQ to query a generic list. Consider the following GenericEmployeeList list:

public List<String> GenericEmployeeList = new List<String>()
{
  "Joydip", "Douglas", "Jini", "Piku",
  "Rama", "Amal", "Indronil"
};

You can use LINQ to query this list as shown in the following code snippet:

IEnumerable<String> employees = from emp in GenericEmployeeList
   select emp;
  foreach (string employee in employees)
  {
    Response.Write(employee);
  }

You can use conditions with your LINQ query as well. The following example...