sudo apt-get update
sudo apt-get upgrade -y
sudo apt-get install apache2

 sudo apt-get install libapache2-mod-mono mono-apache-server4

 sudo gedit /etc/apache2/sites-available/default

 MonoAutoApplication disabled
AddHandler mono .aspx .ascx .asax .ashx .config .cs .asmx .axd
MonoApplications "/:/var/www"
MonoServerPath default "/usr/bin/mod-mono-server4"

 SetHandler mono
DirectoryIndex index.aspx index.html default.aspx Default.aspx

 <DirectoryMatch "/([bB]in|[Aa]pp_[Cc]ode|[Aa]pp_[Dd]ata|[Aa]pp_[Gg]lobal[Rr]esources|[Aa]pp_[Ll]ocal[Rr]esources)/">
Order deny,allow
Deny from all
</DirectoryMatch>

 sudo service apache2 restart

 # r,w,exec for user + group
sudo chgrp -R www-data /var/www
sudo chown -R www-data /var/www
sudo chown -R www-data:www-data /var/www
sudo chmod -R 755 /var/www

 gedit /var/www/index.html

 sudo nautilus

 sudo gedit /etc/apache2/sites-available/default

 AddMonoApplications default "/webforms_test:/var/www/WebFormsApp/"
<Location /webforms_test>
SetHandler mono
</Location>

 AddMonoApplications default "/mvc_test:/var/www/Mvc4ProjectApp/"
<Location /mvc_test>
SetHandler mono
</Location>

<VirtualHost *:80>
ServerAdmin webmaster@localhost
        MonoAutoApplication disabled
        AddHandler mono .aspx .ascx .asax .ashx .config .cs .asmx .axd
        MonoApplications "/:/var/www"
        MonoServerPath default "/usr/bin/mod-mono-server4"

DocumentRoot "/var/www"
<Directory />
Options FollowSymLinks
AllowOverride None
</Directory>
<Directory /var/www/>
                SetHandler mono
                DirectoryIndex index.aspx index.html default.aspx Default.aspx
Options Indexes Includes FollowSymLinks MultiViews
AllowOverride None
Order allow,deny
allow from all                
</Directory>

ScriptAlias /cgi-bin/ /usr/lib/cgi-bin/
<Directory "/usr/lib/cgi-bin">
AllowOverride None
Options +ExecCGI -MultiViews +SymLinksIfOwnerMatch
Order allow,deny
Allow from all
</Directory>

        <DirectoryMatch "/([bB]in|[Aa]pp_[Cc]ode|[Aa]pp_[Dd]ata|[Aa]pp_[Gg]lobal[Rr]esources|[Aa]pp_[Ll]ocal[Rr]esources)/">
          Order deny,allow
          Deny from all
        </DirectoryMatch>

        AddMonoApplications default "/webforms_test:/var/www/WebFormsApp/"
        <Location /webforms_test> 
         SetHandler mono
        </Location>

       AddMonoApplications default "/mvc_test:/var/www/Mvc4ProjectApp/"
        <Location /mvc_test> 
         SetHandler mono
        </Location>

ErrorLog ${APACHE_LOG_DIR}/error.log

# Possible values include: debug, info, notice, warn, error, crit,
# alert, emerg.
LogLevel warn

CustomLog ${APACHE_LOG_DIR}/access.log combined
</VirtualHost>

a:first

p:odd

p:even

<table id="languages">
     <thead>
          <tr>
               <th>Language</th>
               <th>Type</th>
               <th>Invented</th>
          </tr>
     </thead>
<tbody>
<tr>
     <td>Java</td>
     <td>Static</td>
     <td>1995</td>
</tr>
<tr>
     <td>Ruby</td>
     <td>Dynamic</td>
     <td>1993</td>
</tr>
<tr>
     <td>Smalltalk</td>
     <td>Dynamic</td>
     <td>1972</td>
</tr>
<tr>
     <td>C++</td>
     <td>Static</td>
     <td>1983</td>
</tr>
</tbody>
</table>

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                    xmlns:system="clr-namespace:System;assembly=mscorlib">
    <system:String x:Key="button1">Hello!</system:String>
    <system:String x:Key="button2">How Are You?</system:String>
    <system:String x:Key="button3">Are You OK?</system:String>
 
</ResourceDictionary>

<Application x:Class="BeRMOoDA.WPF.LocalizationSample.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             StartupUri="MainWindow.xaml">
    <Application.Resources>
 
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>
                <ResourceDictionary Source="Culture_en-US.xaml"/>
            </ResourceDictionary.MergedDictionaries>
        </ResourceDictionary>
 
    </Application.Resources>
</Application>

<Button Content="{DynamicResource ResourceKey=button1}" />
<Button Content="{DynamicResource ResourceKey=button2}" />
<Button Content="{DynamicResource ResourceKey=button3}" />

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                    xmlns:system="clr-namespace:System;assembly=mscorlib">
    <ResourceDictionary.MergedDictionaries>
        <ResourceDictionary Source="Culture_fa-IR_Farsi.xaml"/>
    </ResourceDictionary.MergedDictionaries>
    <system:String x:Key="button1">سلام!</system:String>
    <system:String x:Key="button2">حالت چطوره؟</system:String>
    <system:String x:Key="button3">خوبی؟</system:String>
</ResourceDictionary>

public class CultureAssemblyModel
    {
        //the text will be displayed to user as language name (like Farsi)
        public string DisplayText { get; set; }
        //name of .dll file (like Culture_fa-IR_Farsi.dll)
        public string Name { get; set; }
        //standar notation of this culture (like fa-IR)
        public string Culture { get; set; }
        //name of resource dictionary file inside the loaded .dll (like Culture_fa-IR.xaml)
        public string XamlFileName { get; set; }
    }

//will keep information about loaded assemblies
public List<CultureAssemblyModel> CultureAssemblies { get; set; }
 
//loads assmeblies in languages folder and adds their info to list
 void LoadCultureAssemblies()
 {
      //we should be sure that list is empty before adding info (do u want to add some cultures more than one? of course u dont!)
      CultureAssemblies.Clear();
      //creating a directory represents applications directory\languages
      DirectoryInfo dir = new DirectoryInfo(System.IO.Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location) + "\\languages");
      //getting all .dll files in the language folder and its sub dirs. (who knows? maybe someone keeps each culture file in a seperate folder!)
      var assemblies = dir.GetFiles("*.dll", SearchOption.AllDirectories);
      //for each found .dll we will create a model and set its properties and then add to list  for (int i = 0; i < assemblies.Count(); i++)
      {

                string name = assemblies[i].Name;

                CultureAssemblyModel model = new CultureAssemblyModel() { DisplayText = name.Split('.', '_')[2], Culture = name.Split('.', '_')[1], Name = name  , XamlFileName =name.Substring(0, name.LastIndexOf(".")) + ".xaml" };
                CultureAssemblies.Add(model);
      }
 }

comboboxLanguages.ItemsSource = CultureAssemblies;

<ComboBox HorizontalAlignment="Left" Margin="10" VerticalAlignment="Top" MinWidth="100" Name="comboboxLanguages">
            <ComboBox.ItemTemplate>
                <DataTemplate>
                    <Label Content="{Binding DisplayText}"/>
                </DataTemplate>
            </ComboBox.ItemTemplate>
</ComboBox>

//loads selected culture
 public void LoadCulture(CultureAssemblyModel culture)
 {
     //creating a FileInfo object represents .dll file of selected cultur
     FileInfo assemblyFile = new FileInfo("languages\\" + culture.Name);
     //loading .dll into memory as a .net assembly
     var assembly = Assembly.LoadFile(assemblyFile.FullName);
     //getting .dll file name
     var assemblyName = assemblyFile.Name.Substring(0, assemblyFile.Name.LastIndexOf("."));
     //creating string represents structure of a pack uri (something like this: /{myassemblyname;component/myresourcefile.xaml}
     string packUri = string.Format(@"/{0};component/{1}", assemblyName, culture.XamlFileName);
     //creating a pack uri
     Uri uri = new Uri(packUri, UriKind.Relative);
     //now we have created a pack uri that represents a resource object in loaded assembly
     //and its time to load that as a resource dictionary (do u remember that we had resource dictionary in culture assemblies? don't u?)
     var dic = Application.LoadComponent(uri) as ResourceDictionary;
     dic.Source = uri;
     //here we will remove current merged dictionaries in our resource dictionary and add recently-loaded resource dictionary as e merged dictionary
     var mergedDics = this.Resources.MergedDictionaries;
     if (mergedDics.Count > 0)
          mergedDics.Clear();
     mergedDics.Add(dic);
 }

void comboboxLanguages_SelectionChanged(object sender, SelectionChangedEventArgs e)
 {
     var selectedCulture = (CultureAssemblyModel)comboboxLanguages.SelectedItem;
     App app = Application.Current as App;
     app.LoadCulture(selectedCulture);
 }

partial class MyType
{
   partial void OnModelCreating(string input); // C# 8.0

   public partial bool IsPet(string input);  // C# 9.0
}

partial class MyType
{
   public partial bool IsPet(string input) =>
     input is "dog" or "cat" or "fish";
}

Button btn = FindViewById<Button>(Resource.Id.button1);

FindViewById<EditText>(Resource.Id.txtname).Text = "";

Intent _intent = new Intent(this, typeof(Activity2));
StartActivity(_intent);

Intent _intent = new Intent(this, typeof(Activity2));
string Test="Vlaueone";

_intent.PutExtra("mainactivity", Test);
StartActivity(_intent);

string Getintent = Intent.GetStringExtra("mainactivity");

List<Product> products;
products = new List<Product>();
Product p = new Product
            {

                name = FindViewById<EditText>(Resource.Id.mainedittextname).Text,
                price = Convert.ToInt32(FindViewById<EditText>(Resource.Id.mainedittextprice).Text)
            };
products.Add(p);
Intent _intent = new Intent(this, typeof(Activity2));
_intent.PutExtra("products", JsonConvert.SerializeObject(products));
StartActivity(_intent);

var p = JsonConvert.DeserializeObject<List<Product>>(Intent.GetStringExtra("products"));
foreach (var item in p)
{
   Toast.MakeText(this, $" {item.name} , {item.price}",
                  ToastLength.Long).Show();
};

//set alert for executing the task
AlertDialog.Builder alert = new AlertDialog.Builder(this);
alert.SetTitle("Confirm delete");
alert.SetMessage("Lorem ipsum dolor sit amet, consectetuer adipiscing elit.");
alert.SetPositiveButton("Delete", (senderAlert, args) =>
            {
                Toast.MakeText(this, "Deleted!", ToastLength.Short).Show();
            });

alert.SetNegativeButton("Cancel", (senderAlert, args) =>
            {
                Toast.MakeText(this, "Cancelled!", ToastLength.Short).Show();
            });

Dialog dialog = alert.Create();
dialog.Show();

public class DialogFragmentActivity : DialogFragment
{
        public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
        {
            var dlg = inflater.Inflate(Resource.Layout.layoutDialog, container, false);
            return dlg;
        }
}

DialogFragmentActivity dlg = new DialogFragmentActivity ();
dlg.Show(this.FragmentManager, "Fragment");

public override void OnStart()
{
            base.OnStart();
            Dialog dialog = Dialog;
            if (dialog != null)
            {
                dialog.Window.SetLayout(ViewGroup.LayoutParams.MatchParent, ViewGroup.LayoutParams.WrapContent);
                dialog.Window.SetBackgroundDrawable(new ColorDrawable(Color.Transparent));
            }
}

public override Dialog OnCreateDialog(Bundle savedInstanceState)
{
            Dialog NotTitle = base.OnCreateDialog(savedInstanceState);
            NotTitle.Window.RequestFeature(WindowFeatures.NoTitle);

            return NotTitle;
}

var src = new Mat(@"..\..\Images\corridor.jpg", LoadMode.AnyDepth | LoadMode.AnyColor);
var srcCopy = new Mat();
src.CopyTo(srcCopy);
 
var markerMask = new Mat();
Cv2.CvtColor(srcCopy, markerMask, ColorConversion.BgrToGray);
 
var imgGray = new Mat();
Cv2.CvtColor(markerMask, imgGray, ColorConversion.GrayToBgr);
markerMask = new Mat(markerMask.Size(), markerMask.Type(), s: Scalar.All(0));
 
var sourceWindow = new Window("Source (Select areas by mouse and then press space)")
{
    Image = srcCopy
};
 
var previousPoint = new Point(-1, -1);
sourceWindow.OnMouseCallback += (@event, x, y, flags) =>
{
    if (x < 0 || x >= srcCopy.Cols || y < 0 || y >= srcCopy.Rows)
    {
        return;
    }
 
    if (@event == MouseEvent.LButtonUp || !flags.HasFlag(MouseEvent.FlagLButton))
    {
        previousPoint = new Point(-1, -1);
    }
    else if (@event == MouseEvent.LButtonDown)
    {
        previousPoint = new Point(x, y);
    }
    else if (@event == MouseEvent.MouseMove && flags.HasFlag(MouseEvent.FlagLButton))
    {
        var pt = new Point(x, y);
        if (previousPoint.X < 0)
        {
            previousPoint = pt;
        }
 
        Cv2.Line(img: markerMask, pt1: previousPoint, pt2: pt, color: Scalar.All(255), thickness: 5);
        Cv2.Line(img: srcCopy, pt1: previousPoint, pt2: pt, color: Scalar.All(255), thickness: 5);
        previousPoint = pt;
        sourceWindow.Image = srcCopy;
    }
};

Point[][] contours; //vector<vector<Point>> contours;
HiearchyIndex[] hierarchyIndexes; //vector<Vec4i> hierarchy;
Cv2.FindContours(
    markerMask,
    out contours,
    out hierarchyIndexes,
    mode: ContourRetrieval.CComp,
    method: ContourChain.ApproxSimple);

var markers = new Mat(markerMask.Size(), MatType.CV_32S, s: Scalar.All(0));
 
var componentCount = 0;
var contourIndex = 0;
while ((contourIndex >= 0))
{
    Cv2.DrawContours(
        markers,
        contours,
        contourIndex,
        color: Scalar.All(componentCount + 1),
        thickness: -1,
        lineType: LineType.Link8,
        hierarchy: hierarchyIndexes,
        maxLevel: int.MaxValue);
 
    componentCount++;
    contourIndex = hierarchyIndexes[contourIndex].Next;
}

var rnd = new Random();
var colorTable = new List<Vec3b>();
for (var i = 0; i < componentCount; i++)
{
    var b = rnd.Next(0, 255); //Cv2.TheRNG().Uniform(0, 255);
    var g = rnd.Next(0, 255); //Cv2.TheRNG().Uniform(0, 255);
    var r = rnd.Next(0, 255); //Cv2.TheRNG().Uniform(0, 255);
 
    colorTable.Add(new Vec3b((byte)b, (byte)g, (byte)r));
}
 
Cv2.Watershed(src, markers);
 
var watershedImage = new Mat(markers.Size(), MatType.CV_8UC3);
 
// paint the watershed image
for (var i = 0; i < markers.Rows; i++)
{
    for (var j = 0; j < markers.Cols; j++)
    {
        var idx = markers.At<int>(i, j);
        if (idx == -1)
        {
            watershedImage.Set(i, j, new Vec3b(255, 255, 255));
        }
        else if (idx <= 0 || idx > componentCount)
        {
            watershedImage.Set(i, j, new Vec3b(0, 0, 0));
        }
        else
        {
            watershedImage.Set(i, j, colorTable[idx - 1]);
        }
    }
}
 
watershedImage = watershedImage * 0.5 + imgGray * 0.5;
Cv2.ImShow("Watershed Transform", watershedImage);
Cv2.WaitKey(1); //do events