How do I find out the count of how many classlist there are

public class Class1
{
    public Int32 id { get; set; }
    public string col1 { get; set; }
    public string col2 { get; set; }
    public string col3 { get; set; }
}

List<Class1> classlist = new List<Class1>();
classlist.Add(new Class1() { id = 1, col1 = "11", col2 = "22", col3="33" });
classlist.Add(new Class1() { id = 2,  col1 = "44", col2 = "55", col3="66" });
classlist.Add(new Class1() { id = 3,  col1 = "77", col2 = "88", col3="99" });