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Applies to: 
 SQL Server  
 Azure SQL Database 
 Azure SQL Managed Instance 
 SQL database in Microsoft Fabric Preview
The type of a geometry instance is null. Returns 0 if the instance isn't null.
Syntax
.IsNull  
Return Types
SQL Server type: bit
CLR type: SqlBoolean
Remarks
IsNull can be used to test whether a geometry instance is null. IsNull returns 0 if the instance isn't null, but null if the instance is null.
This method is primarily used by the SQL Server infrastructure; it isn't recommended that you use IsNull to test whether an instance is null.