The FormFieldAdding event provides [FormFieldAddEventArgs](https://help.syncfusion.com/cr/blazor/Syncfusion.Blazor.SfPdfViewer.FormFieldAddEventArgs.html), which includes [Field](https://help.syncfusion.com/cr/blazor/Syncfusion.Blazor.SfPdfViewer.FormFieldAddEventArgs.html#Syncfusion_Blazor_SfPdfViewer_FormFieldAddEventArgs_Field) (form field details), [PageNumber](https://help.syncfusion.com/cr/blazor/Syncfusion.Blazor.SfPdfViewer.FormFieldAddEventArgs.html#Syncfusion_Blazor_SfPdfViewer_FormFieldAddEventArgs_PageNumber) (target page), and [Cancel](https://help.syncfusion.com/cr/blazor/Syncfusion.Blazor.SfPdfViewer.FormFieldAddEventArgs.html#Syncfusion_Blazor_SfPdfViewer_FormFieldAddEventArgs_Cancel) (to prevent addition).
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