lista generica como parametro de un metodo en c#

public static  List<T> pesquisa_lista<T>(string campo, string valor, List<T> lista)  
{
   return new List<T>();
}
List<Employee> emp = new List<Employee>();

//Maintaining DataTable on ViewState
//For Demo only

DataTable dt = ViewState["CurrentEmp"] as DataTable;

//read data from DataTable 
//using lamdaexpression


emp = (from DataRow row in dt.Rows

   select new Employee
   {
       _FirstName = row["FirstName"].ToString(),
       _LastName = row["Last_Name"].ToString()

   }).ToList();
 class SomeTestClass { public DateTime Start { get; } = DateTime.Now; public DateTime Now => DateTime.Now; }