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Docs > API Reference > DevExtreme-Based Controls > DevExtreme.AspNet.Mvc.Builders.DataSources > DataLibraryApiBuilder<TSelf> > Methods > OnBeforeSend
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DataLibraryApiBuilder<TSelf>.OnBeforeSend Method

Name Parameters Description
OnBeforeSend(RazorBlock) jsFunc Specifies a function used to customize a web request before it is sent.
OnBeforeSend(String) jsFunc Specifies a function used to customize a web request before it is sent.