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EntityDataSource.ContextDisposing Event

Occurs before an ObjectContext is disposed of.

Namespace:  System.Web.UI.WebControls
Assembly:  System.Web.Entity (in System.Web.Entity.dll)

public event EventHandler<EntityDataSourceContextDisposingEventArgs> ContextDisposing
<asp:EntityDataSource OnContextDisposing="EventHandler" />

Handle this event to prevent the ObjectContext used by the EntityDataSource control from being disposed of. Do this when you want to use a single ObjectContext instance in your page with several controls or instances of the EntityDataSource control. To prevent the ObjectContext from being disposed of, set the Cancel property of the EntityDataSourceContextDisposingEventArgs object to true. For more information, see Object Context Life-Cycle Management (EntityDataSource). For more information about the object context, see Identity Resolution, State Management, and Change Tracking (Entity Framework).

To keep an existing ObjectContext instance member for future reference cancel the ContextCreated event as shown by the following code.

        protected void EntityDataSource2_ContextDisposing(object sender, 
            EntityDataSourceContextDisposingEventArgs e)
        {
            e.Cancel = true;
        }

.NET Framework

Supported in: 4.5, 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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