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Docs > API Reference > DevExtreme-Based Controls > DevExtreme.AspNet.Mvc.Builders.DataSources > StaticJsonDataSourceBuilder > Methods > OnModifying
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StaticJsonDataSourceBuilder.OnModifying Method

Name Parameters Description
OnModifying(RazorBlock) jsFunc A function that is executed before a data item is added, updated, or removed.
OnModifying(String) jsFunc A function that is executed before a data item is added, updated, or removed.