private string name = string.Empty;
public string Name
{
    get { return this.name; }
    set 
    {
        if (value == null)
        {
            this.name = "";
            return;
        }
        this.name = value; 
    }
}

public IList<string> GetCultures()
{
    //...
}

public static class LanguageExtender
{
        public static string GetSafeStringValue(this XElement input)
        {
            return (input == null) ? string.Empty : input.Value;
        }

        public static DateTime GetSafeDateValue(this XElement input)
        {
            return (input == null) ? DateTime.MinValue : DateTime.Parse(input.Value);
        }
}

    public class FingerPrint
    {
        private static string fingerPrint = string.Empty;
        public static string Value()
        {
            if (string.IsNullOrEmpty(fingerPrint))
            {
                fingerPrint = GetHash("CPU >> " + cpuId() + "\nBIOS >> " +
            biosId() + "\nBASE >> " + baseId()
                    +"\nDISK >> "+ diskId() + "\nVIDEO >> " + 
                    videoId() +"\nMAC >> "+ macId());
            }
            return fingerPrint;
        }
        private static string GetHash(string s)
        {
            MD5 sec = new MD5CryptoServiceProvider();
            ASCIIEncoding enc = new ASCIIEncoding();
            byte[] bt = enc.GetBytes(s);
            return GetHexString(sec.ComputeHash(bt));
        }
        private static string GetHexString(byte[] bt)
        {
            string s = string.Empty;
            for (int i = 0; i < bt.Length; i++)
            {
                byte b = bt[i];
                int n, n1, n2;
                n = (int)b;
                n1 = n & 15;
                n2 = (n >> 4) & 15;
                if (n2 > 9)
                    s += ((char)(n2 - 10 + (int)'A')).ToString();
                else
                    s += n2.ToString();
                if (n1 > 9)
                    s += ((char)(n1 - 10 + (int)'A')).ToString();
                else
                    s += n1.ToString();
                if ((i + 1) != bt.Length && (i + 1) % 2 == 0) s += "-";
            }
            return s;
        }


        #region Original Device ID Getting Code
        //Return a hardware identifier
        private static string identifier
        (string wmiClass, string wmiProperty, string wmiMustBeTrue)
        {
            string result = "";
            System.Management.ManagementClass mc =
        new System.Management.ManagementClass(wmiClass);
            System.Management.ManagementObjectCollection moc = mc.GetInstances();
            foreach (System.Management.ManagementObject mo in moc)
            {
                if (mo[wmiMustBeTrue].ToString() == "True")
                {
                    //Only get the first one
                    if (result == "")
                    {
                        try
                        {
                            result = mo[wmiProperty].ToString();
                            break;
                        }
                        catch
                        {
                        }
                    }
                }
            }
            return result;
        }
        //Return a hardware identifier
        private static string identifier(string wmiClass, string wmiProperty)
        {
            string result = "";
            System.Management.ManagementClass mc =
        new System.Management.ManagementClass(wmiClass);
            System.Management.ManagementObjectCollection moc = mc.GetInstances();
            foreach (System.Management.ManagementObject mo in moc)
            {
                //Only get the first one
                if (result == "")
                {
                    try
                    {
                        result = mo[wmiProperty].ToString();
                        break;
                    }
                    catch
                    {
                    }
                }
            }
            return result;
        }
        private static string cpuId()
        {
            //Uses first CPU identifier available in order of preference
            //Don't get all identifiers, as it is very time consuming
            string retVal = identifier("Win32_Processor", "UniqueId");
            if (retVal == "") //If no UniqueID, use ProcessorID
            {
                retVal = identifier("Win32_Processor", "ProcessorId");
                if (retVal == "") //If no ProcessorId, use Name
                {
                    retVal = identifier("Win32_Processor", "Name");
                    if (retVal == "") //If no Name, use Manufacturer
                    {
                        retVal = identifier("Win32_Processor", "Manufacturer");
                    }
                    //Add clock speed for extra security
                    retVal += identifier("Win32_Processor", "MaxClockSpeed");
                }
            }
            return retVal;
        }
        //BIOS Identifier
        private static string biosId()
        {
            return identifier("Win32_BIOS", "Manufacturer")
                + identifier("Win32_BIOS", "SMBIOSBIOSVersion")
            + identifier("Win32_BIOS", "IdentificationCode")
                + identifier("Win32_BIOS", "SerialNumber")
                + identifier("Win32_BIOS", "ReleaseDate")
                + identifier("Win32_BIOS", "Version");
        }
        //Main physical hard drive ID
        private static string diskId()
        {
            return identifier("Win32_DiskDrive", "Model")
            + identifier("Win32_DiskDrive", "Manufacturer")
            + identifier("Win32_DiskDrive", "Signature")
            + identifier("Win32_DiskDrive", "TotalHeads");
        }
        //Motherboard ID
        private static string baseId()
        {
            return identifier("Win32_BaseBoard", "Model")
            + identifier("Win32_BaseBoard", "Manufacturer")
            + identifier("Win32_BaseBoard", "Name")
            + identifier("Win32_BaseBoard", "SerialNumber");
        }
        //Primary video controller ID
        private static string videoId()
        {
            return identifier("Win32_VideoController", "DriverVersion")
            + identifier("Win32_VideoController", "Name");
        }
        //First enabled network card ID
        private static string macId()
        {
            return identifier("Win32_NetworkAdapterConfiguration",
                "MACAddress", "IPEnabled");
        }
        #endregion
    }

/// Generates a 16 byte Unique Identification code of a computer 
/// Example: 4876-8DB5-EE85-69D3-FE52-8CF7-395D-2EA9

var computerId = FingerPrint.Value();

public class Article
{
    public int Id { set; get; }

    public string Title { set; get; }

    public string Content { set; get; }

    public int AuthorId { set; get; }
}

List<Article> articles = new()
{
    new Article { Id = 1, Title = "Best title one", Content = "Amazing content", AuthorId = 1 },
    new Article { Id = 2, Title = "Another title", Content = "More amazing content", AuthorId = 1 },
    new Article { Id = 3, Title = "Unicorns", Content = "Even more amazing content", AuthorId = 1 },
    new Article { Id = 4, Title = "Best title one", Content = "Amazing content", AuthorId = 1 },
    new Article { Id = 5, Title = "Another title", Content = "More amazing content", AuthorId = 1 },
    new Article { Id = 6, Title = "Unicorns", Content = "Even more amazing content", AuthorId = 1 },
    new Article { Id = 7, Title = "Best title one", Content = "Amazing content", AuthorId = 1 },
    new Article { Id = 8, Title = "Another title", Content = "More amazing content", AuthorId = 1 },
    new Article { Id = 9, Title = "Unicorns", Content = "Even more amazing content", AuthorId = 1 },
    new Article { Id = 10, Title = "Best title one", Content = "Amazing content", AuthorId = 1 },
    new Article { Id = 11, Title = "Another title", Content = "More amazing content", AuthorId = 1 },
    new Article { Id = 12, Title = "Unicorns", Content = "Even more amazing content", AuthorId = 1 },
};

var pageNumber = 1;
var itemsPerPage = 5;
IEnumerable<Article> pageArticles = articles.Skip((pageNumber - 1) * itemsPerPage).Take(itemsPerPage);
Console.WriteLine($"Articles of page: {pageNumber}");
foreach (var article in pageArticles)
{
    Console.WriteLine($" Id: {article.Id}, Title:{article.Title}, Content:{article.Content}, AuthorId:{article.AuthorId}");
}

pageNumber = 1;
itemsPerPage = 5;
IEnumerable<Article[]> allPagesArticles = articles.Chunk(itemsPerPage);
Console.WriteLine($"Articles of page: {pageNumber}");
foreach (var article in allPagesArticles.ElementAt(pageNumber - 1))
{
    Console.WriteLine($" Id: {article.Id}, Title:{article.Title}, Content:{article.Content}, AuthorId:{article.AuthorId}");
}

 public interface CopyFileListener
    {
        void PublishProgress(long fileSize,long copiedSize);
    }

 textView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                
            }
        });

public class MemoryWare {

    public interface CopyFileListener
    {
        void PublishProgress(long fileSize,long copiedSize);
    }
....
}

SetOnClickListener

 editText.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {

            }

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {

            }

            @Override
            public void afterTextChanged(Editable s) {

            }
        });

  @Override
    public View getView(int position, View rowView, ViewGroup parent) {

        ViewHolder viewHolder=null;
        if(rowView==null)
        {
            // 1. Create inflater
            LayoutInflater inflater = (LayoutInflater) context
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);

            // 2. Get rowView from inflater
            rowView = inflater.inflate(R.layout.row_bank_group_list, parent, false);
            viewHolder=new ViewHolder();
            viewHolder.txtGroupName=(TextView) rowView.findViewById(R.id.text_groupName);
            rowView.setTag(viewHolder);
        }
        else
        {
            viewHolder=(ViewHolder)rowView.getTag();
        }
        viewHolder.txtGroupName.setText(getItem(position).getName());
        viewHolder.txtGroupName.setTypeface(new FontSystem().get_General_Font(context));
        viewHolder.txtGroupName.setTextColor(context.getResources().getColor(R.color.black));

        return rowView;
    }

File file=new File(sdcardPath,fileName);

if(file.CanWrite())
{
  .....
}

File file=new File(sdcardPath);

if(file.CanWrite())
{
file=new File(sdcardPath,filePath);
  .....
}

Environment.getExternalStorageDirectory()

/Data/Data

/Data/Data/Info.Dotnettips.MyApp

    /**
     * it will returns sd path for you
     *  <p>
     *  <b>Required Permission: </b>android.permission.READ_EXTERNAL_STORAGE<br/>
     * </p>
     * @return
     */
    public  List<String> GetExternalMounts() {
        final List<String> out = new ArrayList<>();
        String reg = "(?i).*vold.*(vfat|ntfs|exfat|fat32|ext3|ext4).*rw.*";
        String s = "";
        try {
            final Process process = new ProcessBuilder().command("mount")
                    .redirectErrorStream(true).start();
            process.waitFor();
            final InputStream is = process.getInputStream();
            final byte[] buffer = new byte[1024];
            while (is.read(buffer) != -1) {
                s = s + new String(buffer);
            }
            is.close();
        } catch (final Exception e) {
            e.printStackTrace();
        }

        // parse output
        final String[] lines = s.split("\n");
        for (String line : lines) {
            if (!line.toLowerCase(Locale.US).contains("asec")) {
                if (line.matches(reg)) {
                    String[] parts = line.split(" ");
                    for (String part : parts) {
                        if (part.startsWith("/"))
                            if (!part.toLowerCase(Locale.US).contains("vold"))
                                if(new File(part).canWrite())
                                    out.add(part);
                    }
                }
            }
        }
        return out;
    }

notesIntent.putExtra("PartyId", PartyId);
startActivity(notesIntent);

PartyId=getIntent().getLongExtra("PartyId",0);

i.putExtra(FilePickerActivity.EXTRA_ALLOW_MULTIPLE, false);
i.putExtra(FilePickerActivity.EXTRA_ALLOW_CREATE_DIR, false);
i.putExtra(FilePickerActivity.EXTRA_MODE, FilePickerActivity.MODE_FILE);

public class MyClass {
    public static final int SOME_CONSTANT = 42;
    public int publicField;
    private static MyClass sSingleton;
    int mPackagePrivate;
    private int mPrivate;
    protected int mProtected;
}

public, protected, private,abstract, static, transient, volatile, synchronized, final, native.

Settings>Editor>Code Style>Arrangement

Settings>Editor>Completion>Case-sensitive Completion>None