How to use spatial data types in SQL Server Database project

Hi guys,

I want to write the stored procedures and the UDF etc in managed code using C#CLR, however i am struggling to find the namespace to be used in SQL Database project type.

This name space https://msdn.microsoft.com/en-us/library/microsoft.sqlserver.types.aspx has got the spatial data types but this is not available in the SQL Server Database project.

For instance i am writing a UDF in CLR managed code and i want to use the geography data type.

regards,