FAQ/applying-hidden-filter-using-inner-query.md
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**Note:** Use the below method only when you have a large number of values. Normaly you don't have to add filters via inner query. Please use AdHocSettings.HiddenFilters instead.
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-##Hidden Filter C♯
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+##Using a Hidden Filter
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For this example, we will use the Northwind database as our datasource.
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Here is our sample report in the report designer:
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##Hidden Filter with SQL Override
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+###C♯
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+
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```csharp
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public override void PreExecuteReportSet(ReportSet reportSet)
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{
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}
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```
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+###VB.NET
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+
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```visualbasic
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Public Overrides Sub PreExecuteReportSet(ByVal reportSet As Izenda.AdHoc.ReportSet)
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MyBase.PreExecuteReportSet(reportSet)