what is the meaning of .close in binaryreader

[urib]

I have binary file of integers and I use some C# code to read from it.

I am a complete beginner in C#(I know better C)

looking at some examples I see that .Close() is used in the end for a binaryreader(never used binaryreader in C)

but if I try to use it then it cause errors if I use the same function twice.

It seems better simply not to close binaryreader and I wonder what is the advantage of closing it

Here is a simple example for a code that works only after I commented r.close out of the program
You can see that I never close r in the code and I wonder if this type of code
can cause problems.

  using System;
using System.IO;
// Program start class
 
class InteractiveWelcome 
{
 
    private const string FILE_NAME = "outputfile.bin";
    public int find_number(int place, FileStream fs)
    {
        int num;
        BinaryReader r = new BinaryReader(fs);
        fs.Seek(place * sizeof(Int32), SeekOrigin.Begin);
        num = r.ReadInt32();
  //      r.Close();
        return num; 
    }
 
    public static void Main(String[] args)
    {
        InteractiveWelcome fd=new InteractiveWelcome();
        FileStream fs = new FileStream(FILE_NAME, FileMode.Open, FileAccess.Read);
        Console.WriteLine(fd.find_number(0,fs));
        Console.WriteLine(fd.find_number(1,fs));
        fs.Close();
    }
 
}

[Plater]

.Close() does just what it sounds like, it closes the stream, releasing the memory it used (and also probably the file it was reading from).
You would call it when you are done with the object

[urib]

Thanks
I guess that closing the file is the reason for the error if I use r.Close()

In this case the question is if closing the file by fs.Close() when I finish the program is enough and I do not need to close the binary reader..

[Plater]

I would say yes, fs.close() is enough.
the binary read would just call it internally anyway.