Provides data for the Deleting event.
System.EventArgs
System.ComponentModel.CancelEventArgs
System.Web.UI.WebControls.LinqDataSourceDeleteEventArgs
Namespace: System.Web.UI.WebControls
Assembly: System.Web.Extensions (in System.Web.Extensions.dll)
Public Class LinqDataSourceDeleteEventArgs _ Inherits CancelEventArgs
public class LinqDataSourceDeleteEventArgs : CancelEventArgs
public ref class LinqDataSourceDeleteEventArgs : public CancelEventArgs
type LinqDataSourceDeleteEventArgs = class inherit CancelEventArgs end
The LinqDataSourceDeleteEventArgs type exposes the following members.
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LinqDataSourceDeleteEventArgs(LinqDataSourceValidationException) | Initializes a new instance of the LinqDataSourceDeleteEventArgs class with the specified exception. |
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LinqDataSourceDeleteEventArgs(Object) | Initializes a new instance of the LinqDataSourceDeleteEventArgs class. |
| Name | Description | |
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Cancel | Gets or sets a value indicating whether the event should be canceled. (Inherited from CancelEventArgs.) |
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Exception | Gets the exception that was thrown while the data was being validated before the delete operation. |
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ExceptionHandled | Gets or sets a value that indicates whether the exception was handled and that it should not be thrown again. |
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OriginalObject | Gets the object that represents the data to delete. |
| Name | Description | |
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Equals(Object) | Determines whether the specified Object is equal to the current Object. (Inherited from Object.) |
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Finalize | Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.) |
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GetHashCode | Serves as a hash function for a particular type. (Inherited from Object.) |
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GetType | Gets the Type of the current instance. (Inherited from Object.) |
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MemberwiseClone | Creates a shallow copy of the current Object. (Inherited from Object.) |
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ToString | Returns a string that represents the current object. (Inherited from Object.) |
The LinqDataSourceDeleteEventArgs object is passed to any handler for the Deleting event. The OriginalObject property contains the data that will be deleted.
If the object that represents the data source throws a validation exception before it deletes the data, the Exception property contains an instance of the LinqDataSourceValidationException class. You can retrieve all the validation exceptions through the InnerExceptions property. If no validation exception is thrown, the Exception property contains null. If you handle the validation exceptions and do not want the exception to be re-thrown, set the ExceptionHandled property to true.
You create an event handler for the Deleting event to validate the data, to examine validation errors from the data class, or to cancel the delete operation. You cancel the delete operation by setting the Cancel property to true.
By default, the LinqDataSource control stores the original values from the data source in view state in the Web page, except those whose ColumnAttribute attribute is marked as UpdateCheck.Never. LINQ to SQL automatically checks the integrity of the data before deleting the data. It does this by comparing the current values in the data source with the original values that are stored in view state. You can perform additional data validation by creating a handler for the Deleting event.
The following example shows how to cancel the delete operation based on a property in the OriginalObject property and a value from the Web page. In the example, users must select a CheckBox control to confirm that they want to delete a product record when its OnSale property is set to true.
Protected Sub LinqDataSource_Deleting(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.LinqDataSourceDeleteEventArgs) Dim product As Product product = CType(e.OriginalObject, Product) If (product.OnSale And Not confirmCheckBox.Checked) Then e.Cancel = True End If End Sub
protected void LinqDataSource_Deleting(object sender, LinqDataSourceDeleteEventArgs e) { Product product = (Product)e.OriginalObject; if (product.OnSale && !confirmCheckBox.Checked) { e.Cancel = true; } }
.NET Framework
Supported in: 4, 3.5Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.