Check the parameter in construtor

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using System;

public class Class1 {
public static void Main(string[] args) {
Student student = new Student(“AAA”, 1234);
Console.WriteLine(“Welcome new student {0}”, student.GetString());
}
}

public class Student {
string sStudentName;
int nStudentID;
int nCreditHours;

public Student(string sName, int nID) {
if (sName == null) {
sName = “invalid”;
}
sStudentName = sName;

if (nID < 0) { nID = 0; } nStudentID = nID; nCreditHours = 0; } public string GetString() { string s = String.Format("{0}({1})",sStudentName, nStudentID); return s; } } [/csharp]