How to write data to a file in Isolated Storage in Windows Phone ?

An Windows Phone Application might need to store and access data .

One of the ways to store the data is the Isolated Storage .

An Windows Phone Application cannot access the data stored by another Windows Phone Application and hence the name “Isolated” .

How to write data to a file in Isolated Storage in Windows Phone ?

A typical use of the Isolated Storage will be to store the Application settings or some Data for the App .

You can create a file and store it in the Isolated Storage of the Windows Phone 7 .

In this example , i will show you how to create a text file in isolated storage , write data to the saved in the isolated storage . How to write data to a file in Isolated Storage in Windows Phone ?

1. Add the namespace IsolatedStorage

using System.IO.IsolatedStorage;

2. Retreive the userscope isolated storage that belongs to the App to the IsolatedStorageFile using the IsolatedStorageFile.GetUserStoreForApplication

IsolatedStorageFile iso = IsolatedStorageFile.GetUserStoreForApplication();

3. Create the file with the iso.CreateFile function and assign it to the IsolatedStorageFileStream ;

IsolatedStorageFileStream stream = iso.CreateFile("Employees.txt");

4. Create an instance of the StreamWriter with the IsolatedStorageFileStream that was created above as the parameter .

StreamWriter streamWrite = new StreamWriter(stream);

5. Write the Data from the textbox to the StreamWriter and close the StreamWriter

streamWrite.Write(textBox1.Text); streamWrite.Close();

6. You are done . The entered data in the textbox is saved to the text file in the isolated storage .

private void button1_Click_1(object sender, RoutedEventArgs e)
{
IsolatedStorageFile iso = IsolatedStorageFile.GetUserStoreForApplication();
IsolatedStorageFileStream stream = iso.CreateFile("Employees.txt");
StreamWriter streamWrite = new StreamWriter(stream);
streamWrite.Write(textBox1.Text);
streamWrite.Close();
}