Introduction to the code of simple program examples of c#

static void main(string[] args) 
{ 
("Enter something");
string s=(); 
("Welcome"+s);
(); 
} 

namespace 
{ 
  struct student 
   { 
     public string stu_id; 
     public string name; 
     public int age; 
     public int score; 
    } 
  class program  
   { 
     static void maini(string[] args) 
    { 
    student s; 
    s.stu_id='' 09306101''; 
=''Xiaohong'';
    =29; 
    =99; 
(''Student number:''+s.stu_id);
    (); 
  }  
}  
} 

static void mian(string[] args) 
{ 
  int max,min; 
  int[] a=new int[10]{1,24,3,72,37,45,41,5,44,8}; 
max=a[0]; 
min=a[0]; 
for(int i=1;i<;i++) 
{ 
 if(max<a[i]) 
max=a[i]; 
if(min>a[i]) 
min=a[i]; 
} 
(''maximum value {0}'',max);
(''Min {0}'',miin);
(); 
  } 
 } 
} 

static void main(string[] args) 
{ 
("Please enter the user name:");
string s=(); 
if((s,''wxy'')==0) 
{ 
('' The demonstration method is started: ");
string str='' hello''; 
("Copy string: {0},(str1));
("String: {}",(3.2));
("Insert: {0}'',(3,"******"));
} 
else 
{ 
("User name is wrong, exit the program");
} 
(); 
}}} 

static void main(string[] args) 
{ 
("Implicit conversion:");
  short i=1234; 
 (i); 
  int s=i; 
(s); 
("Explanatory conversion:");
long l=12345; 
(l); 
int l1=(int)l; 
(l1); 
(); 
} 

static void main(string[] args) 
{ 
int i=123; 
object obj=123; 
int j=(int)obj; 
("x={0}",i); 
("obj={0}",obj); 
("j={0}",j); 
(); 
}