LinqDataSourceUpdateEventArgs.OriginalObject Property

Definition

Namespace:

System.Web.UI.WebControls

Assembly:

System.Web.Extensions.dll

Gets the object that contains the values that were originally retrieved from the data source.

public:
 property System::Object ^ OriginalObject { System::Object ^ get(); };

public object OriginalObject { get; }

member this.OriginalObject : obj

Public ReadOnly Property OriginalObject As Object

Property Value

Object

An object of the type specified in the TableName property that contains the data that was retrieved from the data source.

Examples

The following example shows an event handler for the Updating event. The example shows how to compare properties from the OriginalObject property and the NewObject property to determine whether the value in the Category property has changed. If so, the CategoryChanged property of the object in the NewObject property is set to true.

protected void LinqDataSource_Updating(object sender, LinqDataSourceUpdateEventArgs e)
{
    Product originalProduct = (Product)e.OriginalObject;
    Product newProduct = (Product)e.NewObject;

    if (originalProduct.Category != newProduct.Category)
    {
        newProduct.CategoryChanged = true;
    }
}

Protected Sub LinqDataSource_Updating(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.LinqDataSourceUpdateEventArgs)
    Dim originalProduct As Product
    Dim newProduct As Product

    originalProduct = CType(e.OriginalObject, Product)
    newProduct = CType(e.NewObject, Product)

    If (originalProduct.Category <> newProduct.Category) Then
        newProduct.CategoryChanged = True
    End If
End Sub

Remarks

You can use the OriginalObject property to check the original values against the current values in the data source and to cancel the update operation or take other action.

The OriginalObject property contains values for only the properties that are persisted in view state in the Web page. A property is persisted under these circumstances:

• When it is displayed in a data-bound control.

• When the ColumnAttribute.UpdateCheck property of the System.Data.Linq.Mapping.ColumnAttribute attribute is set to Always or WhenChanged.

If the UpdateCheck property is set to Never and the value is not displayed in a data-bound control, the value is not stored in the Web page. In that case, it cannot be assigned to the OriginalObject property.