Isolated Storage in the Silverlight Application

Isolated Storage

Isolated Storage in the Silverlight Application

Definition:
Isolated storage is a mechanism which, provide data storage isolation and safety by defining standardized ways of associating code with saved data. Standardization provides some more benefits as well.
Uses of tools from designing, reconfiguration storage, make security
policies apart from this remove unused data all are the tasks of
Administrators
Using isolated storage there no need to write unique paths in the file system, so, hard-coded things are immaterial. With this all is controlled by computer's security policy. The uses of this is appreciable in web applications where user/client must have to use some cautions while running these applications.
Security policy doe not allow to access the file system using I/O mechanism, by default all is granted to access isolated storage

For more information on Isolated Storage Visit here

How to increase the space of the issolatedStorage of the application

Steps To Test The Current Space for the application

1. Run any Silverlight Application Right click on it it will show you the silverlight button. Click on it


2. Now the Silverlight properties Dialog will appear
   Now select the Application Storage Tab It will show you the Application storgae for all the silverlight application on the system
   
   
   Steps


3. Create an application with the name "IsolatedStorageApp". You can name it as per your choice I will be using this in my example Application.
   
   
   Add New silverlight control and name it as "IncreaseIsolatedStorage.xaml"
   
4. Right-click on the IsolatedStorageApp in the solution explorer


1. Choose Add
   
2. New Item


3. Silverlight User Control. In the Name box rename it to IncreaseIsolatedStorage


5. 
   
   
   
6. For our purpose we are only taking three textblocks to
   display Space Used, Space Available, Current Quota and the textbox for the New Space request. Add The Following lines in the .xaml file
   <Canvas Canvas.Left="10" Canvas.Top="10">
   <TextBlock Canvas.Left="10" x:Name="SpacedUsed" >Current Spaced Used=</TextBlock>
   <TextBlock Canvas.Left="10" x:Name="SpaceAvaiable" Canvas.Top="20">Current
   Space Available=</TextBlock>
   <TextBlock Canvas.Left="10" x:Name="CurrentQuota" Canvas.Top="40">Current
   Quota=</TextBlock>
   <TextBlock Canvas.Left="10" x:Name="NewSpace" Canvas.Top="70">New
   space (in bytes) to request=</TextBlock>
   <TextBox Canvas.Left="255" Canvas.Top="70" Width="100" x:Name="SpaceRequest"></TextBox>
   <TextBlock Canvas.Left="365" Canvas.Top="70" Width="60">(1048576
   = 1 MB)</TextBlock>
   <Button Canvas.Left="10" Content="Increase Storage" Canvas.Top="100" Width="100" Height="50" Click="Button_Click"></Button>
   <TextBlock Canvas.Left="10"
   Canvas.Top="160" x:Name="Result"></TextBlock>
   </Canvas>
Now our page will look like:





7. To set The Values of the Three TextBlocks lets create a function GetStorageData and call it in the constructor.
   private void GetStorageData()
   {
   //creating an object for the IsolatedStorageFile
   using (IsolatedStorageFile MyAppStore = solatedStorageFile.GetUserStoreForApplication())
   {
   //calculating the space used
   SpacedUsed.Text = "Current Spaced Used = " + (MyAppStore.Quota
   - MyAppStore.AvailableFreeSpace).ToString() + " bytes";
   //getting the AvailableFreeSpace
   SpaceAvaiable.Text = "Current Space Available="
   + MyAppStore.AvailableFreeSpace.ToString() + " bytes";
   //getting the Current Quota
   CurrentQuota.Text = "Current Quota=" + MyAppStore.Quota.ToString() + " bytes";
   }
   }
   Here we will be missing a namespace "System.IO.IsolatedStorage" So include it.


8. Now the function to increase the quota
   
   /// <summary>
   /// Increases the Isolated Storage Space of the current Application
   /// </summary>
   /// <param name="spaceRequest">
   Total Space Requested to increase</param>
   private void IncreaseStorage(long spaceRequest)
   {
   //creating an object for the IsolatedStorageFile for current Application
   using (IsolatedStorageFile MyAppStore = solatedStorageFile.GetUserStoreForApplication())
   {
   //Calculating the new space
   long newSpace = MyAppStore.Quota + spaceRequest;
   try
   {
   //displays a message box for the increase request.
   //if accepted by the user then displays the result as quota increased
   //else unsuccessful.
   if (true == MyAppStore.IncreaseQuotaTo(newSpace))
   {
   Result.Text = "Quota successfully increased.";
   }

else
{
Result.Text = "Quota increase was unsuccessfull.";
}
}
catch (Exception e)
{
Result.Text = "An error occured: " + e.Message;
}
//recalculate the static
GetStorageData();
}
}

Handling the button event
private void Button_Click(object sender, RoutedEventArgs e)
{
try
{
//taking the space request in the long variable
long spaceRequest = Convert.ToInt64(SpaceRequest.Text);
//calling the function to increase the space
IncreaseStorage(spaceRequest);
}
catch
{
Result.Text = "Bad Data Entered by the user";
}
}

1. Run the Application and click on the Button after filling the textbox with the desired space to increase.
   A Dialog box will appear for the confirmation click yes to see the results.
   
   
   

Download Code

Thanks and Regards

Meetu Choudhary

My Web My Fourm

Sending Mails with attachments using Gmail

Many times I came across the question that how can we send mails with some files as attachments and in continuation do we reaky need to buy some domain of our's to send mail or there is a domain using which we can send mails using gmail or yahoo or hotmail accounts. so the answer. So I decided to write this article which will help in solving the above quest.

Let answer First the above questions and then we will code how to send mails with attachments.
Question : Do we need our own domain to send mails?
Answer : No we do not necessarily need our own domain to send mails. Gmail
provides us free pop service and yahoo, hotmail and other mail engines charge for the service. Rather if we have our own domain that would be a benefit.
Question : Can we send files as an attachment?
Answer : Yes we can and even any extension of file can be send as attachment if server allows that as Gmail do not allow to send exe files rest you can send pdf,html,doc etc. any.
Question : Some Times our code is perfectly fine still we are not able to send mails ether we get error failed to send or could not connect to the server what may be the reasons?

Answer : The Reasons is very simple that we have some firewalls or the anti
virus installed on the system which prevents us to do so Specially Mac Fee prevents us sending the mails by blocking the port. The
Remedies is just off the antivirus for some time and then try sending the mail.

Requirements:

Development Machine Requirements

1. Dotnet installed on the system VS2005 or above The Downloadable version comes for VS2008
2. Files to attach with the mails
3. Anti-Virus off while debugging the application

Client Side Requirements

1. Dotnet Framework 2.0 or above in which the application is made
2. Browser to run the Application
3. Anti-Virus off while executing the application
   

Now lets start developing the application

1. Create a web application with the name "SendMailWithAttachment". You can even use any name of your choice I am using this for my example.
2. Add The Following code in the body tag of the Default.aspx page to genrate an interface for the aplication.
<%@
Page Language="C#"
AutoEventWireup="true"
CodeBehind="Default.aspx.cs"
Inherits="SendMailWithAttachment._Default"
%>

<!DOCTYPE
html PUBLIC
"-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html
xmlns="http://www.w3.org/1999/xhtml"
>

<head
runat="server">

<title>Send
Mail Using Gmail Account With Attachments</title> </head>
<body>
<form id="Form1" method="post" runat="server">

<table borderColor="#339933" cellSpacing="0" cellPadding="4" width="55%" align="center" border="1">
<tr>
<td>
<table cellPadding="4" width="70%" align="center" border="0"> <tr bgColor="#339933"> <td align="center" colSpan="2"><asp:label id="lblHeader" Runat="server"
Font-Bold="True">Gmail Account Details for Sending Mails</asp:label></td> </tr>
<tr>
<td vAlign="middle" align="right" width="40%">Username:</td> <td
vAlign="middle" width="60%"> <asp:TextBox
ID="txtUserName" runat="server" Font-Names="Verdana" Font-Size="X-Small" Width="350px"></asp:TextBox>
</td>
</tr>
<tr>
<td vAlign="middle" align="right" width="40%">Password</td> <td
vAlign="middle" width="60%"> <asp:TextBox
ID="txtPassword" Font-Names="Verdana" Font-Size="X-Small" Width="350px" runat="server" TextMode="Password"></asp:TextBox>
</td>
</tr>
<tr bgColor="#339933"> <td align="center" colSpan="2"><asp:label id="Label1" Runat="server"
Font-Bold="True">SMTP
Mail with Attachment</asp:label></td>
</tr>
<tr>
<td vAlign="middle" align="right" width="40%">From :</td> <td vAlign="middle"
width="60%"><asp:textbox id="txtSender"
tabIndex="1" runat="server" Font-Names="Verdana" Font-Size="X-Small" Width="350px"></asp:textbox></td>
</tr>
<tr>
<td vAlign="middle" align="right">To :</td>
<td><asp:textbox id="txtReceiver" tabIndex="1"
runat="server" Font-Names="Verdana" Font-Size="X-Small"
Width="350px"></asp:textbox></td>
</tr>
<tr>
<td vAlign="middle" align="right">Cc :</td>
<td><asp:textbox id="txtCc" tabIndex="1" runat="server"
Font-Names="Verdana" Font-Size="X-Small" Width="350px"></asp:textbox></td>
</tr>
<tr>
<td vAlign="middle" align="right">Bcc :</td>
<td><asp:textbox id="txtBcc" tabIndex="1" runat="server"
Font-Names="Verdana" Font-Size="X-Small" Width="350px"></asp:textbox></td>
</tr> <tr>
<td vAlign="middle" align="right">Subject :</td>
<td><asp:textbox id="txtSubject" tabIndex="2" runat="server" Font-Names="Verdana" Font-Size="X-Small"
Width="350px"></asp:textbox></td>
</tr>
<tr>
<td vAlign="middle" align="right">Format :</td>
<td><asp:radiobuttonlist id="rblMailFormat" tabIndex="3"
runat="server" repeatcolumns="2" repeatdirection="Horizontal">
<asp:ListItem Value="Text" Selected="True">Text</asp:ListItem>
<asp:ListItem Value="HTML">HTML</asp:ListItem>
</asp:radiobuttonlist></td>
</tr>
<tr>
<td vAlign="middle" align="right">Message :</td>
<td height="84"> <p><asp:textbox id="txtBody"
tabIndex="4" runat="server" Font-Names="Verdana" Font-Size="X-Small" columns="40" rows="5" textmode="MultiLine" width="350px"></asp:textbox></p> </td>
</tr>
<tr>
<td vAlign="middle" align="right">Attachment :</td><td><input id="inpAttachment1" tabIndex="5" type="file" size="53" name="filMyFile" runat="server"></td> </tr>
<tr>
<td vAlign="middle" align="right">Attachment :</td>
<td><input id="inpAttachment2" tabIndex="6" type="file"
size="53" name="filMyFile" runat="server"></td>
</tr>
<tr>
<td vAlign="middle" align="right">Attachment :</td>
<td><input id="inpAttachment3" tabIndex="7" type="file"
size="53" name="filMyFile" runat="server"></td>
</tr>
<tr>
<td align="center" colSpan="2"><asp:button id="btnSend"
tabIndex="9" runat="server" width="100px" text="Send" onclick="btnSend_Click"></asp:button></td>
</tr>
<tr>
<td align="center" colSpan="2"><asp:Label ID="lblMessage"
Runat="server"></asp:Label>
</td>
</tr>
</table>
</td> </tr> </table>
</form>
</body>
</html>

1. The Default.aspx will now look like:

2. Now Let us code for the Functionality double Click on the button and the event handler is genrated for the buttonclick
   Before we start the code for the event let us include some namespaces:
   
1. using System.Net.Mail;
2. using System.IO;
3. using System.Drawing;
   
   Here is the code for the button event. The code is having inline commets to explain the meamning of each line.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Net.Mail;
using System.IO;
using System.Drawing;

namespace SendMailWithAttachment
{
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void btnSend_Click(object sender, EventArgs e)
{

try
{
/* Create a new blank MailMessage with the from and to
adreesses*/
MailMessage mailMessage = new MailMessage txtSender.Text,txtReceiver.Text);
/*Checking the condition that the cc is empty or not if
not then * include them
*/
if (txtCc.Text != null && txtCc.Text != string.Empty)
{
mailMessage.CC.Add(txtCc.Text);
}
/*Checking the condition that the Bcc is empty or not
if not then
* include them
*/
if (txtBcc.Text != null && txtBcc.Text != string.Empty)
{
mailMessage.Bcc.Add(txtBcc.Text);
}
//Ading Subject to the Mail
mailMessage.Subject = txtSubject.Text;
//Adding the Mail Body
mailMessage.Body = txtBody.Text;
/* Set the properties of the MailMessage to the
values on the form as per the mail is HTML formatted or plain text */
if (rblMailFormat.SelectedItem.Text ==
"Text")
mailMessage.IsBodyHtml = false;
else
mailMessage.IsBodyHtml = true;
/* We use the following variables to keep track of
attachments and after we can delete them */
string attach1 = null;
string attach2 = null;
string attach3 = null;
/*strFileName has a attachment file name for
attachment process. */
string strFileName = null;
/* Bigining of Attachment1 process & Check the first open file dialog for a attachment */
if (inpAttachment1.PostedFile != null)
{
/* Get a reference to PostedFile object */
HttpPostedFile attFile = inpAttachment1.PostedFile;
/* Get size of the file */
int attachFileLength = attFile.ContentLength;
/* Make sure the size of the file is > 0 */
if (attachFileLength > 0)
{
/* Get the file name */
strFileName = Path.GetFileName(inpAttachment1.PostedFile.FileName);

/* Save the file on the server */
inpAttachment1.PostedFile.SaveAs(Server.MapPath(strFileName));
/* Create the email attachment with the uploaded file
*/
Attachment attach = new
Attachment(Server.MapPath(strFileName));
/* Attach the newly created email attachment */
mailMessage.Attachments.Add(attach);
/* Store the attach filename so we can delete it later
*/
attach1 = strFileName;
}
}
/* Attachment-2 Repeat previous step defiend above*/
if (inpAttachment2.PostedFile != null)
{
HttpPostedFile attFile = inpAttachment2.PostedFile;
int attachFileLength = attFile.ContentLength;
if (attachFileLength > 0)
{
strFileName = Path.GetFileName(inpAttachment2.PostedFile.FileName); inpAttachment2.PostedFile.SaveAs(Server.MapPath(strFileName));
Attachment attach = new Attachment(Server.MapPath(strFileName));
mailMessage.Attachments.Add(attach);
attach2 = strFileName;
}
}
/* Attachment-3 Repeat previous steps step defiend above*/
if (inpAttachment3.PostedFile != null)
{
HttpPostedFile attFile = inpAttachment3.PostedFile;
int attachFileLength = attFile.ContentLength;
if (attachFileLength > 0)
{
strFileName = Path.GetFileName(inpAttachment3.PostedFile.FileName); inpAttachment3.PostedFile.SaveAs(Server.MapPath(strFileName));
Attachment attach = new Attachment(Server.MapPath(strFileName));
mailMessage.Attachments.Add(attach);
attach3 = strFileName;
}
}
/* Set the SMTP server and send the email with attachment */
SmtpClient smtpClient = new SmtpClient();
// smtpClient.Host = emailServerInfo.MailServerIP;
//this will be the host in case of gamil and it varies from the service provider
smtpClient.Host = "smtp.gmail.com";
//smtpClient.Port = Convert.ToInt32 emailServerInfo.MailServerPortNumber);
//this will be the port in case of gamil for dotnet and
it varies from the service provider
smtpClient.Port = 587;
smtpClient.UseDefaultCredentials = true;
//smtpClient.Credentials = new
System.Net.NetworkCredential(emailServerInfo.MailServerUserName,
emailServerInfo.MailServerPassword);
smtpClient.Credentials = new System.Net.NetworkCredential(txtUserName.Text, txtPassword.Text);
//this will be the true in case of gamil and it varies
from the service provider
smtpClient.EnableSsl = true;
smtpClient.Send(mailMessage);
/* Delete the attachements if any */
try{

if (attach1 != null)
File.Delete(Server.MapPath(attach1));
if (attach2 != null)
File.Delete(Server.MapPath(attach2));
if (attach3 != null)
File.Delete(Server.MapPath(attach3));

}
catch{}
/* clear the controls */
txtSender.Text = string.Empty;
txtReceiver.Text = string.Empty;
txtCc.Text = string.Empty;
txtBcc.Text = string.Empty;
txtSubject.Text = string.Empty;
txtBody.Text = string.Empty;
txtUserName.Text = string.Empty;
/* Dispaly a confirmation message to the user. */
lblMessage.Visible = true;
lblMessage.ForeColor = Color.Black;
lblMessage.Text = "Message sent.";
}
catch (Exception ex)
{
/* Print a message informing the user about the exception that was risen */
lblMessage.Visible = true;
lblMessage.ForeColor = Color.Red;
lblMessage.Text = ex.ToString();
}
}
}
}

Download code from here

Thanks and Regards

Meetu Choudhary

My Blog My Web My Forums