Get Mindate And Max Date froa

 
 public class Student
        {            private int id;            public int Id
            {
                get { return id; }
                set { id = value; }
            }
            private string name;            public string Name
            {
                get { return name; }
                set { name = value; }
            }            private DateTime admissionDate;            public DateTime AdmissionDate
            {
                get { return admissionDate; }
                set { admissionDate = value; }
            }        }
//ready list and call List<Student> stdList = new List<Student> {

new Student{Id=1,Name="A", AdmissionDate = DateTime.Now.AddDays(-100)},

new Student{Id=2,Name="B", AdmissionDate = DateTime.Now.AddDays(-10)},

new Student{Id=3,Name="C", AdmissionDate = DateTime.Now.AddDays(-101)},

new Student{Id=4,Name="D", AdmissionDate = DateTime.Now.AddDays(-102)},

new Student{Id=5,Name="E", AdmissionDate = DateTime.Now.AddDays(-107)},

new Student{Id=6,Name="F", AdmissionDate = DateTime.Now.AddDays(-106)},

new Student{Id=7,Name="G", AdmissionDate = DateTime.Now.AddDays(-11)},

new Student{Id=8,Name="H", AdmissionDate = DateTime.Now.AddDays(-150)},

new Student{Id=9,Name="I", AdmissionDate = DateTime.Now.AddDays(-150)},

new Student{Id=10,Name="J", AdmissionDate = DateTime.Now.AddDays(-170)},

new Student{Id=11,Name="K", AdmissionDate = DateTime.Now.AddDays(-160)},

new Student{Id=12,Name="L", AdmissionDate = DateTime.Now.AddDays(-170)},

new Student{Id=13,Name="M", AdmissionDate = DateTime.Now.AddDays(-130)},

new Student{Id=14,Name="N", AdmissionDate = DateTime.Now.AddDays(-120)},

new Student{Id=15,Name="O", AdmissionDate = DateTime.Now.AddDays(-30)},

new Student{Id=16,Name="P", AdmissionDate = DateTime.Now.AddDays(-120)},

new Student{Id=17,Name="Q", AdmissionDate = DateTime.Now.AddDays(-80)},

new Student{Id=18,Name="R", AdmissionDate = DateTime.Now.AddDays(-104)},

};

DateTime minDate;

DateTime maxDate;

ExtensionCLS.GetMinMaxDate(stdList, "AdmissionDate",out minDate, out maxDate);

string outPutString = "The Mindate Is:" + minDate + " The max date Is:" + maxDate;

Console.WriteLine(outPutString);

Console.ReadLine();

}

      public static void GetMinMaxDate<T>(this List<T> source, string valueField, out DateTime minDate, out DateTime maxDate)
        {            List<T> obsColl = new List<T>();            DateTime _maxDate = DateTime.Now;            DateTime _minDate = DateTime.Now;            if (source.Count > 0)
            {                foreach (T element in source)
                {                    if (element.GetType().GetProperty(valueField).GetValue(element, null) != null)
                    {                        obsColl.Add(element);                    }                }                _minDate = (DateTime)(dynamic)(from obj in obsColl select obj.GetType().GetProperty(valueField).GetValue(obj, null)).Min();                _maxDate = (DateTime)(dynamic)(from obj in obsColl select obj.GetType().GetProperty(valueField).GetValue(obj, null)).Max();            }            minDate = _minDate;            maxDate = _maxDate;        } 



Output: The Mindate Is:11/29/2012 2:16:11 AM  The max date Is:5/8/2013 2:16:11 AM