Calling C# code from Sql procedure: Method 2

Take a look this TSQL example

USE [XXX] GO SET ANSI_NULLS OFF GO SET QUOTED_IDENTIFIER OFF GO CREATE PROCEDURE [dbo].[Testing_XXX]
@broadcastId [int],
@XXXTemplateHtml [nvarchar](max),
@XXXTemplateText [nvarchar](max),
@XXXTemplateSubject [nvarchar](max),
@XXXTemplateEmailHeaders [nvarchar](max),
@XXXTemplateHeader [nvarchar](max),
@XXXTemplateFooter [nvarchar](max),
@masterTemplate [nvarchar](max),
@parseOptions [nvarchar](4000),
@xsltTemplate [nvarchar](max) OUTPUT WITH EXECUTE AS CALLER AS EXTERNAL NAME  SolutionXXX.ProjectXXX].[StoredProcedures].[XXX_Parser_Parse] GO

When you call

EXTERNAL NAME [SolutionXXX.ProjectXXX].[StoredProcedures].[XXX_Parser_Parse]

It invokes a C# function looks like this

 [SqlProcedure]
public static void XXX_Parser_Parse(
    SqlInt32 broadcastId,
    [SqlFacet(MaxSize = -1)] 
    SqlString XXXTemplateHtml,
    [SqlFacet(MaxSize = -1)] 
    SqlString XXXTemplateText,
    [SqlFacet(MaxSize = -1)] 
    SqlString XXXTemplateSubject,
    [SqlFacet(MaxSize = -1)] 
    SqlString XXXTemplateEmailHeaders,
    [SqlFacet(MaxSize = -1)] 
    SqlString XXXTemplateHeader,
    [SqlFacet(MaxSize = -1)] 
    SqlString XXXTemplateFooter,
    [SqlFacet(MaxSize = -1)] 
    SqlString masterTemplate,
    SqlString parseOptions,
    [SqlFacet(MaxSize = -1)] 
    out SqlString xsltTemplate)
{
//blah blah blh
}