C # methods to overload Constructor

I encountered a little trouble in my work today. concerning the problem of constructor overloading, I used to directly use the same function name to input different parameters during method overloading. The following code is used:

 1     public class UserData
 2     {
 3 
 4 
 5         public bool UpdateUser(string username, string password, int age, int sex,int id)
 6         {
 7             return true;
 8         }
 9 
10         public bool UpdateUser(string username,int id)
11         {
12             return UpdateUser(username, "", 0, 0,id);
13         }
14     }

When the constructor is overloaded, the above method will not work and an error will be reported.

The reason is that I will not explain much. constructors are used for instantiation. After several attempts, I finally found a solution.

1 public class user
2 {
3 /// <summary>
4 // Initialize an empty user class instance.
5 /// </Summary>
6 public user ()
7 {
8
9}
10
11 /// <summary>
12 // initialize a user-class instance that contains user information.
13 /// </Summary>
14 /// <Param name = "username"> User Name </param>
15 /// <Param name = "password"> password </param>
16 /// <Param name = "Age"> age </param>
17 // <Param name = "sex"> gender </param>
18 public user (string username, string password, int age, int sex)
19 {
20 This. _ username = username;
21 This. _ password = password;
22 This. _ age = age;
23 This. _ sex = sex;
24}
25
26 /// <summary>
27 /// initialize a user-class instance that contains the user name and password.
28 /// </Summary>
29 // <Param name = "username"> </param>
30 /// <Param name = "password"> </param>
31 public user (string username, string password)
32: This (username, password, 0, 0)
33 {
34}
35
36 private int _ id;
37 private string _ username;
38 private string _ password;
39 private int _ age;
40 private int _ sex;
41
42
43 public int ID
44 {
45 get {return _ id ;}
46 set {_ id = value ;}
47}
48
49 public int sex
50 {
51 get {return _ sex ;}
52 set {_ sex = value ;}
53}
54
55 public int age
56 {
57 get {return _ age ;}
58 set {_ age = value ;}
59}
60
61 Public String Password
62 {
63 get {return _ password ;}
64 set {_ password = value ;}
65}
66
67 Public String Username
68 {
69 get {return _ username ;}
70 set {_ username = value ;}
71}