API/CodeSamples/AllowSelfJoin.md
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+#AllowSelfJoin
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+
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+[[_TOC_]]
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+
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+##About
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+
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+Gets or sets the value indicating whether self-joining tables is allowed in reports. If this is true and [[ShowDataSourcesAsCheckBoxes|/API/CodeSamples/ShowDataSourcesAsCheckboxes]] is also true, then the user can select the same data source twice to self-join it at the Data Sources tab in the ReportDesigner. This can be useful when you need to pick data from a single table where one value is equal to another.
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+
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+##Global.asax (C♯)
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+
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+```csharp
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+//main class: inherits DatabaseAdHocConfig or FileSystemAdHocConfig
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+public class CustomAdHocConfig : Izenda.AdHoc.DatabaseAdHocConfig
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+{
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+ // Configure settings
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+ // Add custom settings after setting the license key and connection string by overriding the ConfigureSettings() method
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+ public static void InitializeReporting() {
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+ //Check to see if we've already initialized.
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+ if (HttpContext.Current.Session == null || HttpContext.Current.Session["ReportingInitialized"] != null)
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+ return;
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+ AdHocSettings.LicenseKey = "INSERT_LICENSE_KEY_HERE";
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+ AdHocSettings.SqlServerConnectionString = "INSERT_CONNECTION_STRING_HERE";
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+ Izenda.AdHoc.AdHocSettings.AdHocConfig = new CustomAdHocConfig();
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+ AdHocSettings.AllowSelfJoin = true; //The relevant setting
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+ HttpContext.Current.Session["ReportingInitialized"] = true;
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+ }
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+}
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+```
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+
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+##Global.asax (VB.NET)
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+
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+```visualbasic
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+
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+'main class: inherits DatabaseAdHocConfig or FileSystemAdHocConfig
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+Public Class CustomAdHocConfig
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+ Inherits Izenda.AdHoc.DatabaseAdHocConfig
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+
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+ Shared Sub InitializeReporting()
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+ 'Check to see if we've already initialized
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+ If HttpContext.Current.Session Is Nothing OrElse HttpContext.Current.Session("ReportingInitialized") IsNot Nothing Then
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+ Return
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+ 'Initialize System
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+ AdHocSettings.LicenseKey = "INSERT_LICENSE_KEY_HERE"
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+ AdHocSettings.SqlServerConnectionString = "INSERT_CONNECTION_STRING_HERE"
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+ Izenda.AdHoc.AdHocSettings.AdHocConfig = New CustomAdHocConfig()
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+ AdHocSettings.AllowSelfJoin = True 'The relevant setting
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+ HttpContext.Current.Session("ReportingInitialized") = True
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+ End Sub
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+End Class
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+```
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