In this tutorial, I'm going to tell you about getting the Geo-location of the user of your Silverlight Application. We will use Javascript as the core of our scenario.

Step 1

You will be calling following JavaScript API here in the aspx page:

 <script language="JavaScript" type="text/javascript" src="http://j.maxmind.com/app/geoip.js"></script>

Now there are functions in that API that will return the Latitude, Longitude, country name and whatever we demand. Some of the function are viz:

•     geoip_country_code()
•     geoip_country_name()
•     geoip_latitude()
•     geoip_longitude()

Instead of just calling these functions directly in Silverlight, we will write our functions that will call these functions and return whatever these functions return. For example here is the custom script written just beneath the API call:

<script type="text/javascript">

   function GetCountryCode() {

   return geoip_country_code();

      }

  function GetCountryName() {

  return geoip_country_name();

      }       

  function GetLatitude() {

  return geoip_latitude();

       }

   function GetLongitude() {

   return geoip_longitude();

        }
 </script>

So finally, here is what the aspx page with API call and the scripts that you have written:

 <script type="text/javascript" src="Silverlight.js"></script>

 <script language="JavaScript" type="text/javascript" src="http://j.maxmind.com/app/geoip.js"></script>

 <script type="text/javascript">

 function GetCountryCode() {

 return geoip_country_code();

   }

 function GetCountryName() {

 return geoip_country_name();

   }

 function GetLatitude() {

 return geoip_latitude();

    }

 function GetLongitude() {

return geoip_longitude();

      }   
 </script>

Step 2

Now let's move toward your mainpage. You must make the JavaScript function call from the main page. As you all know, it is a simple method call:

HtmlPage.Window.Invoke("<JavaScriptMethod>");

The XAML of the main page consists of four Text Blocks, each to pursue the respective value for Country code, Country Name, Latitude and Longitude.

 <Grid x:Name="LayoutRoot" Background="White">

 <TextBlock x:Name="txtCountryCode" Margin="20 20 0 0"/>

 <TextBlock x:Name="txtCountryName" Margin="20 40 0 0"/>

 <TextBlock x:Name="txtLatitude" Margin="20 60 0 0"/>

  <TextBlock x:Name="txtLongitude" Margin="20 80 0 0"/>

  </Grid>

For giving the corresponding values to the Blocks, you need to write some C# in the code behind and in the constructor of the main page.

    public MainPage()

    {

   InitializeComponent();

  txtCountryCode.Text = HtmlPage.Window.Invoke("GetCountryCode").ToString();

  txtCountryName.Text = HtmlPage.Window.Invoke("GetCountryName").ToString();

  txtLatitude.Text = HtmlPage.Window.Invoke("GetLatitude").ToString();

  txtLongitude.Text = HtmlPage.Window.Invoke("GetLongitude").ToString();  

That's it. Just hit F5 and run the project. It will provide you all the information you've requested in the code.

Happy coding!

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In this post, I will show you how to drag and drop a RichTextBox in Silverlight. For your information, the code below also could be adapted to drag any element around.

The XAML that you are going to use here consists of one Border control which contains your Rich TextBox.  The Border control has several event handlers defined to capture the Mouse Buttons and Movement:

<UserControl x:Class="TreeViewDragAndDrop.Page"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:liquidTreeView="clr-namespace:Liquid;assembly=Liquid.TreeView"
    Width="400" Height="300">
    <Grid x:Name="LayoutRoot" Background="White" VerticalAlignment="Top" HorizontalAlignment="Left">
        <liquidTreeView:Tree x:Name="tree" EnableDragAndDrop="true" Drop="Tree_Drop" Width="300" Height="151" Margin="4">
            <liquidTreeView:Tree.Nodes>
                <liquidTreeView:Node ID="0" Title="Root" Icon="images/folder.png" IconExpanded="images/folderOpen.png">
                    <liquidTreeView:Node.Nodes>
                        <liquidTreeView:Node ID="1" Title="Folder 1" Icon="images/folder.png" IconExpanded="images/folderOpen.png">
                            <liquidTreeView:Node.Nodes>
                                <liquidTreeView:Node ID="10" Title="File 1.doc" Icon="images/doc.png" />
                                <liquidTreeView:Node ID="11" Title="File 2.doc" Icon="images/doc.png" />
                            </liquidTreeView:Node.Nodes>
                        </liquidTreeView:Node>
                        <liquidTreeView:Node ID="2" Title="Folder 2" Icon="images/folder.png" IconExpanded="images/folderOpen.png">
                            <liquidTreeView:Node.Nodes>
                                <liquidTreeView:Node ID="20" Title="File 3.doc" Icon="images/doc.png" />
                                <liquidTreeView:Node ID="21" Title="File 4.doc" Icon="images/doc.png" />
                                <liquidTreeView:Node ID="21" Title="File 5.doc" Icon="images/doc.png" />
                            </liquidTreeView:Node.Nodes>
                        </liquidTreeView:Node>
                    </liquidTreeView:Node.Nodes>
                </liquidTreeView:Node>
            </liquidTreeView:Tree.Nodes>
        </liquidTreeView:Tree>
    </Grid>
</UserControl>

The C# for this tutorial contains the 3 event handlers which do the actual work here. Remember your Border control has been placed on a Canvas object which allows you to specify using absolute coordinates where the Border should be rendered:

using System.Windows.Controls;

using Liquid;

namespace TreeViewDragAndDrop
{
    public partial class Page : UserControl
    {
        public Page()
        {
            InitializeComponent();
        }

        private void Tree_Drop(object sender, TreeEventArgs e)
        {
            e.DropAction = Tree.DropActions.InsertAfter;
        }
    }
}

As you can see, you have detected when the mouse is clicked over the border (using the Border_MouseLeftButtonDown event) and set _mouseDown = true, you also call myBorder.CaptureMouse(), this is important as it tells Silverlight to route allmouse events to the Border control.

When the user moves the mouse the new position of the Border is calculated by adding the amount of pixels the cursor has moved since the last MouseMove event was called.  This is all handled in the Border_MouseMove event. And the final mouse event handler, Border_MouseLeftButtonUp clears the _mouseDown flag releases the capture lock we set previously.

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In Silverlight, due to security issues, an ordinary application is NOT allowed to write to/read from arbitrary locations on the file system (except through some dialogs). How do we save those data temporarily inside the file system (such as a text file) so that the application can retrieve and use it later? Sure you can use the Isolated Storage Feature in Silverlight.

Isolated Storage allows you to access to a small segment of hard-disk space, which you will have no idea where the files are being stored. Usually you need it when you want to store small amounts of not essential information (eg: user-specific details, user preferences). Especially when you want to communicate with the web service, having the back-up storage can enable to page to reload the data without the user retyping again.

You can save DateTime into the memory and can retrieve it using Isolated Storage. Here is the example:'

Step 1

First, you need to open an Isolated Store. You can use the IsolatedStorageFile class and call the static IsolatedStorageFile.GetUserStoreForApplication() method:

IsolatedStorageFile store = IsolatedStorageFile.GetUserStoreForApplication()

With this, you can use System.IO namespace to write and read data.

Step 2

Now, you have to write DateTime into memory as follows:

using (IsolatedStorageFile store = IsolatedStorageFile.GetUserStoreForApplication())
            {
                using (IsolatedStorageFileStream stream = store.CreateFile("Date.txt"))
                {
                    StreamWriter writer = new StreamWriter(stream);
                    writer.Write(DateTime.Now);
                    writer.Close();
                }
                textBox1.Text = "Data written";
            }

Step 3

Then, you can retrieve DateTime from memory, use this following code:

using (IsolatedStorageFile store = IsolatedStorageFile.GetUserStoreForApplication())
            {
                using (IsolatedStorageFileStream stream = store.OpenFile("Date.txt", FileMode.Open))
                {
                    StreamReader reader = new StreamReader(stream);
                    textBox2.Text = reader.ReadLine();
                    reader.Close();
                }
            }

Simple right?

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Have you ever wonder, how do you actually program on the server side to handle the requests by the client? And how do a client know that his uploading request has been complete before proceeding to the another one? There are several approaches for the solution. Here, I introduce how to create WCF (Windows Communication Foundation) web service in Silverlight, which involves lesser code.

How to Create a WCF Web Service:

a) Right-click your ASP.NET website, add the Silverlight-enabled WCF Service template.
b) Create a new method (with the OperationContract attribute)
c) Right-click your Silverlight project -> Add Service. Click Discover button. Then Click OK button.

After you have add a service reference, Visual Studio actually creates a proxy class that you can interface with the Web Service. The proxy class is named after the original Service class name + the world Client at the end.

How to use or call the WCF Web Service:

Import the namespace for the service reference. In Silverlight, all web services are asynchronous. That means after you have called the method to fire it, it returns immediately and proceed to the next line of code. When the response is received, you handle the event inside the MethodNameCompleted.

A standard order of using the web service is as follow:

    Service1Client myService = new Service1Client();
    myService.BeginUploadCompleted += new EventHandler<System.ComponentModel.AsyncCompletedEventArgs>(myService_BeginUploadCompleted);
    myService.BeginUploadAsync(...);

That's all, simple, right?

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The DataGrid control in the Silverlight is one of the very important and useful controls. It is highly customizable with support of sorting, editing, grouping and paging. Here, this tutorial will talk about how to add data dynamically into the DataGrid. Specifically, it lets the user to input the Staff data during run time, as many as he/she likes.

Here the example of output in Silverlight that I have made:

Add a DataGrid by Drag and Drop, then add 3 columns

Note that each column has a binding path to the variable it displays.

    <sdk:DataGrid AutoGenerateColumns="False" Height="206" HorizontalAlignment="Left" Margin="12,65,0,0" Name="myDataGrid" VerticalAlignment="Top" Width="352" >
                <sdk:DataGrid.Columns>
                    <sdk:DataGridTextColumn Header="Name" Binding="{Binding Path=staffName, Mode=OneWay}" Width="120"></sdk:DataGridTextColumn>
                    <sdk:DataGridTextColumn Header="ID" Binding="{Binding Path=staffID, Mode=OneWay}" Width="100"></sdk:DataGridTextColumn>
                    <sdk:DataGridTextColumn Header="Age" Binding="{Binding Path=staffAge, Mode=OneWay}" Width="100"></sdk:DataGridTextColumn>
                </sdk:DataGrid.Columns>
            </sdk:DataGrid>

Create a class for the Data Object. Eg: Staff.cs

Define the variables which used in the data binding in the class

            public string staffName { get; set; }
            public string staffID { get; set; }
            public string staffAge { get; set; }

            public Staff(string _name, string _id, string _age)
            {
                staffName = _name;
                staffID = _id;
                staffAge = _age;
            }

Add Button

This is the button that fires the event assigning the values. Here, I use ObservableCollection<Staff> to store the data inside the DataGrid. (Define it as a global variable).

            private void AddButton_Click(object sender, RoutedEventArgs e)
            {
                //Get the text from the textboxes
                string _name = textBox1.Text;
                string _id = textBox2.Text;
                string _age = textBox3.Text;
              
                //Add them inside the ObservableCollection variable: collectionInRow
                collectionInRow.Add(new Staff(_name, _id, _age));

                //This is the Most Vital line: assign the Source of the dataGrid to the ObservableCollection
                myDataGrid.ItemsSource = collectionInRow;
            }

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Unlike normal C#, in Silverlight, you can't access a control's coordinate through the object.Location.X and object.Location.Y. Instead, it is more troublesome to get and set the values. So this tutorial will tell you wow to get and set the control's coordinate/location/position.

For example, if you want to add Label on the GUI through the code instead of XAML, you have to do the following codes:

          Label[] arrayScores = new Label[MAX_PLAYERS]; //MAX_PLAYERS = 4
          for (int i = 0; i < arrayScores.Length; i++)
                {
                    arrayScores[i] = new Label();
                    arrayScores[i].Name = "Scores" + i;
                    arrayScores[i].Width = 50;
                    arrayScores[i].Height = 30;
                }

But that's not enough, you haven't set the coordinates of the Labels. You might think that adding the remaining codes at anywhere can do the job. However, it does not. Remember to put the coordinates setting code 'AFTER' the page is loaded.

Step 1

Add this.Loaded event in the constructor after the InitializeComponent()

    public MainPage()
            {
                InitializeComponent();
                ...
                ...
                this.Loaded += new RoutedEventHandler(MainPage_Loaded);
            }

Step 2

Set coordinates using CANVAS: set position, then add into canvas.

void MainPage_Loaded(object sender, RoutedEventArgs e)
        {
            Canvas.SetLeft(arrayScores[0], SCORE_OFFSET_LEFT);
            Canvas.SetLeft(arrayScores[1], SCORE_OFFSET_LEFT);
            Canvas.SetLeft(arrayScores[2], SCORE_OFFSET_LEFT);
            Canvas.SetLeft(arrayScores[3], SCORE_OFFSET_LEFT);
            canvas1.Children.Add(arrayScores[0]);
            canvas2.Children.Add(arrayScores[1]);
            canvas3.Children.Add(arrayScores[2]);
            canvas4.Children.Add(arrayScores[3]);
        }

That's all! And you're done!

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Most of us do not like applications that continuosly bothering with popup messages to make us aware that something happened. Sometimes, a message box coming up saying "Changes were saved succesfully" right after pressing the save button, this condition is so bothering because our work can be interrupted by the unimportant notification box. Maybe, we better would like to be told that it worked if it allows us to keep going or you'd better be told if something went wrong.

For example, during Christmas a lot of messages full of best wishes are going around. You can sent one of those to one friend and after a while an Overlay Notification appeared at the bottom of your screen saying "Message received by [contact]". So, in this post, I will tell you how to make that kind of notification in Silverlight which isn't keep bothering you while you were working on something.

Step 1

First, let us create a User Control. The control will be the already mentioned Overlay Notification. You canl make it appear and disappear after a while without user interaction. This could be the XAML code:

 <UserControl x:Class="SilverlightTestApp.Controls.OverlayNotification"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d">
   
    <UserControl.Resources>
        <Storyboard x:Name="ShowMessage" Completed="ShowMessage_Completed">
            <DoubleAnimation
            Duration="00:00:06"
            From="0.00"
            To="1.00"
            AutoReverse="True"
            Storyboard.TargetName="Popup"
            Storyboard.TargetProperty="Opacity"/>           
        </Storyboard>       
    </UserControl.Resources>
   
    <Grid x:Name="LayoutRoot" Background="White" HorizontalAlignment="Center" >
        <Border BorderBrush="Black" BorderThickness="1" MinWidth="150" MaxWidth="550" MaxHeight="75"
                   CornerRadius="4" Background="Transparent" Visibility="Collapsed" Opacity="0" x:Name="Popup">
            <TextBlock x:Name="lblMessage" HorizontalAlignment="Center" TextWrapping="Wrap" MaxWidth="400" MaxHeight="75"></TextBlock>
        </Border>
    </Grid>   

</UserControl>

Step 2

You have a Storyboard that will be triggered whenever you want to show the Notification. It will last 6 seconds (plus another 6 because of the AutoReverse=true). And will change the Opacity of our notification area to give the impression that it fades in and out.

Then you already had a Border with rounded corners. You'll have to make it visible whenever you want to show the message and hide it when the Storyboard is done. Inside of this Border, you will have a Textblock where your message will be displayed.

Let's take a look at the code behind:

using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;

namespace SilverlightTestApp.Controls
{
    public partial class OverlayNotification : UserControl
    {
        private string _message;
        public string Message
        {
            get
            {
                return _message;
            }
            set
            {
                _message = value;
                lblMessage.Text = value;
                Popup.Visibility = Visibility.Visible;
                ShowMessage.Begin();
            }
        }

        private System.Windows.Media.Color _color;
        public System.Windows.Media.Color Color
        {
            get
            {
                return _color;
            }
            set
            {
                _color = value;
                var newBrush = new SolidColorBrush();
                newBrush.Color = value;
                lblMessage.Foreground = newBrush;
            }
        }

        public OverlayNotification()
        {
            InitializeComponent();
        }

        private void ShowMessage_Completed(object sender, System.EventArgs e)
        {
            Popup.Visibility = Visibility.Collapsed;
        }
    }
}

You will expose at least the Message property (you also have the Color property for the font). Notice that everytime you set the Message property we update the Textblock's text, make the Border visible and trigger the Storyboard. Also noticed that you can handle the Storyboard's completed event to hide the Border.

To use it, just add this new User Control into the view where you want to use it in the same way that you would place a Textbox or any other control:

<my:OverlayNotification x:Name="myOverlayNotification"/>

Then, whenever you want to show a Notification, just set the Message property with the message you want to display:

 myOverlayNotification.Color = Colors.Red;
 myOverlayNotification.Message = "This is a test notification";

Feel free to play around with it modifying the layout and appeareance of the control in the XAML or adding more properties to be able to customize it more, for example, adding a BackgroundColor property.

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Navigation Framework is absolutely good however in some cases we have a tendency to don't need to use the Navigation Framework. This navigation technique may be used instead that provides simple Navigation. Add the following code in App.xaml:

private static Grid root    
public static void Navigate(UserControl newPage)
{
UserControl oldPage = root.Children[0] as UserControl;
root.Children.Add(newPage);
root.Children.Remove(oldPage);
}

Now, Edit the App.xaml as shown below:
Previous code: 
private void Application_Startup(object sender, StartupEventArgs e)
{
 this.RootVisual = new MainPage();
 }

Modified code:
private void Application_Startup(object sender, StartupEventArgs e)
{
root = new Grid();
root.Children.Add(new MainPage());
this.RootVisual = root;     
}

Create a new usercontrol NewPage . Add Button to the Page inorder to navigate to the home. equally produce a button within the MainPage.xaml as well inorder to navigate to the NewPage. within the Button Click event add the following code:
       App app = (App)Application.Current;
        App.Navigate(new NewPage());

Application.Current gets the System.Windows.Application object for this application. The new instance of the Page is passed to the Navigate method of App class. When we run the code we are able to navigate between the MainPage and also the NewPage.xaml.

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When you worked with Silverlight to create an GUI to let the user to upload the file, it is important to create a progress bar to make the user aware of the uploading progress.Today, I will show you how to create a progress bar while uploading a file.

Here is the sample of the progress bar that I've created:

Several resources can be obtained online, but the explaination is either not clear enough, or there are redundant codes confusing people. Here, the code is as simplest as possible, with the assumption that,
a) there is no connection lost between the client and the server during the process
b) there is no data corrupted during the transmission
c) small file size (can be edited)

Before we go with code, first you can observe that there are 4 UI components:
a) Browser button
b) Textbox shows file name (can be disabled)
c) Upload button
d) Progress bar + labels

Browser Button

Here's the code to create the browser button:

    OpenFileDialog dialog = new OpenFileDialog(); //OpenFileDialog will open a file dialog which allows the use to browser the wanted file.
    if ((bool)dialog.ShowDialog())
    {
          globalFileStream = dialog.File.OpenRead();
          ....
          ....
    }

Upload Button

An always updating progress bar means that, the upload progress has to be done 'Chunk' by 'Chunk'. To achieve this, we read the file stream 'Chunk' by 'Chunk and upload it.

Step 1 : Send First Chunck

    int steps = (int)(fileLength / (long)CHUNK_SIZE);
    progressBar1.Minimum = 0;               //set prograssbar info
    progressBar1.Maximum = steps;
    int read = 0;
    byte[] buffer = null;                                                                //buffer to store the file stream chunk by chunk
    if (globalFileStream.Length <= CHUNK_SIZE)                            //consider if the file size is smaller than the predefined chunk size
    {
          buffer = new byte[(int)globalFileStream.Length];
    }
    else
    {
          buffer = new byte[CHUNK_SIZE];
    }
    read = globalFileStream.Read(buffer, 0, buffer.Length);
    filePosition += read;
    myUpload.BeginUploadAsync(fileName, destinationFolder, buffer);       //begin upload the first chunk

Step 2: Sends second and subsequent chunk

    UpdateProgressBar(); //Update progress bar
    if (filePosition < fileLength)
    {
         int read = 0;
         int readSize = CHUNK_SIZE;
         byte[] buffer = null;
         long diff = fileLength - filePosition;
         if (diff < CHUNK_SIZE)
         {
               readSize = (int)diff;
         }
         buffer = new byte[readSize];
         globalFileStream.Seek(filePosition, SeekOrigin.Begin);
         read = globalFileStream.Read(buffer, 0, readSize);
         filePosition += read;
         myUpload.ContinueUploadAsync(theFileName, "here", buffer);

For your information, progress bar provided by Silverlight doesn't have the percentage displayed. Hence, I additionally put a label on top of the progress bar. The label contents are the percentage of the file stream sent to the server.

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