Quota Property
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IsolatedStorageFile.Quota Property

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

Gets a value that represents the maximum amount of space available for isolated storage.

Namespace:  System.IO.IsolatedStorage
Assembly:  mscorlib (in mscorlib.dll)

public long Quota { get; }

Property Value

Type: System.Int64
The limit of isolated storage space, in bytes.


The isolated store has been removed.


Isolated storage is disabled.


The isolated store has been disposed.

This property obtains the value from the store's associated quota group. The initial quota is 1 MB to be shared by all of the domain's applications.

Use the AvailableFreeSpace property to determine whether you need to increase the quota by using the IncreaseQuotaTo method.

The following example checks the quota size. This example is part of a larger example provided for IsolatedStorageFile class.

// Assumes an event handler for the MouseLeftbuttonUp
// event is defined for a control named 'IncreaseQuota'
// In the control's XAML: MouseLeftButtonUp="IncreaseQuota_OnLeftMouseButtonUp"

// User first selects UI to increase the quota.
public void IncreaseQuota_OnClick(object sender, MouseEventArgs e)

    // Obtain an isolated store for an application.
        using (var store = IsolatedStorageFile.GetUserStoreForApplication())
            // Request 5MB more space in bytes.
            Int64 spaceToAdd = 5242880;
            Int64 curAvail = store.AvailableFreeSpace;

            // If available space is less than
            // what is requested, try to increase.
            if (curAvail < spaceToAdd)

                // Request more quota space.
                if (!store.IncreaseQuotaTo(store.Quota + spaceToAdd))
                    // The user clicked NO to the
                    // host's prompt to approve the quota increase.
                    // The user clicked YES to the
                    // host's prompt to approve the quota increase.

    catch (IsolatedStorageException)
        // TODO: Handle that store could not be accessed.


Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

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