I am a beginner and I have problem with namespace and Property, could someone show me where I have made the mistake.

// Exception Handling

using System;
using Students;

public class ExceptionHandling {

 static void Main(){

// We declare two students object references, but only instantiate one
// Student object; s2 is given a value of null, indicating that it
// isn't presently holding onto any object.

student s1 = new student();
student s2 = null;

// Exception handling is now in place.

try {
 Console.WriteLine("Initializing students....");

 // this line executes without throwing exception.

 s1.Name = "Fred";

 // This next line of code throws a NullReferenceException at run time because
 // s2 was never initialized to refer to an actual Student object ...

 s2.Name = "Mary";

 // ... and as soon as the exception is detected by the runtime, execution
 // jumps out of the try block -- none of the remaining code in
 // this try block will be executed -- and into the first catch block
 // below that is found to match a NullReferenceException, if any.

 s1.Major = "MATH";
 S2.Major = "SCIENCE";

 Console.WriteLine("Initialization successfully completed.");
} // end of try block

//Pseudocode.

catch (UnrelatedExceptionType e1) {
 // exception handing code fo this type of (hypothetical) exception
 // goes here ... but, since our example doesn't involve throwing this
 // particular type of exception at run time, this catch block will be
 // skipped over without being executed.

 Console.WriteLine("UnrelatedExceptionType was detected ...");
} // end of catch (UnrelatedExceptionType e1)

catch (NullReferenceException e2) {

 // Here where we place the code for what the program should do if
 // a null reference ws detected at run time.

 Console.WriteLine("Whoops -- we forgot to initialize all of the students!");
} // end of catch (NullReference Exception e2)

finally {

 // This code gets executed whether or not an exception occured;  that is,
 // whether we made it through the try block without any exceptions being
  // thrown, or whether one of the catch blocks was triggered.

 Console.WriteLine("Finally");
} // end of finally

// After the finally block executes, control transfers to the
// line of code immediately following block.

Console.WriteLine("Continuing along our merry way ...");
}
}

// This class has the simple name "Student".
using System;

namespace Students

{
public class student {

private string name;
private string major;

public string Name {
get{
return name;
}
set {
name = value;
}
}
public string Major {
get{
return name;
}
set {
major = value;
}
}

}
}