.NET Framework 4.5.2+
.NET Framework 4.5.2+
.NET Standard 2.0+
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SpreadsheetDataSourceLoadingOptions.CustomAssemblyBehavior Property

Specifies the behavior when the EFDataSource attempts to load a custom assembly during mail merge.

Namespace: DevExpress.XtraSpreadsheet

Assembly: DevExpress.Spreadsheet.v19.1.Core.dll


public SpreadsheetCustomAssemblyBehavior CustomAssemblyBehavior { get; set; }

Property Value

Type Description

A SpreadsheetCustomAssemblyBehavior enumeration member that specifies an action performed when attempting to load a custom assembly during mail merge.

Property Paths

You can access this nested property as listed below:

Library Object Type Path to CustomAssemblyBehavior
WinForms Controls SpreadsheetControlOptions
Office File API DocumentOptions


This property is accessible using the SpreadsheetControl.Options.DataSourceLoading.CustomAssemblyBehavior notation.

The SpreadsheetCustomAssemblyBehavior.Prompt value raises the SpreadsheetControl.CustomAssemblyLoading event and calls the ICustomAssemblyLoadingNotificationService.RequestApproval method of the SpreadsheetControl service to determine whether to load the Entity Framework data context from a custom assembly.


Use the SpreadsheetDataSourceWizardOptions.CustomAssemblyBehavior property to specify whether the Data Source Wizard can load a custom assembly containing the Entity Framework data context.

See Also