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public class Person
{    public string FirstName{set;get;}    public string LastName{set;get;}    public Person(){}    public Person(string firstName, string lastName)
    {
        FirstName = firstName;
        LastName = lastName;
    }
}

List<Person> personList=new List<Person>();
personList.Add(new Person() { FirstName = "Mickey", LastName = "Mouse" });
personList.Add(new Person() { FirstName = "Mickey", LastName = "Mouse" });
personList.Add(new Person() { FirstName = "zhang", LastName = "san" });string columnName="FirstName";var dics=personList.GroupBy(x => GetPropertyValue(x, columnName)).ToDictionary(x=>x.Key,x=>x.Count());foreach(var dic in dics)
{
    textBox1.AppendText(string.Format("{0},{1}\r\n",dic.Key,dic.Value));
}