How to create assembly and functions using CLR

http://towardsnext.wordpress.com/2008/12/12/clr-string-titlecase-function-in-sql-server-2005-clr-integration/

With new feature of CLR integration we can provide function with in our assemblies which can be accessed by the user in the TSQL statements. Let us now try to create one title case function. First create one library project in visual studio 2005. Then create one class with one function inside that.

using System;
using System.Collections.Generic;
using System.Text;
using System.Data.SqlTypes;
using Microsoft.SqlServer.Server;

namespace AssemblyFunctions
{

public partial class MySQLFunctions    
{
[SqlFunction(IsDeterministic = true, IsPrecise = true)]
public static string TitleCase(string data)
{
string caseData = data.ToString().Substring(0, 1).ToUpper()
+ data.ToString().Substring(1, data.ToString().Length -1).ToLower();

return caseData;
}
}
}

Now we can compile this assembly and keep it at one location. Then move to MSSQL Management Studio and there in query window. execute following commands one bye one
First we need to enable the CLR integration for that we have to use the sp_configure store procedure in the following way

--Configure the clr enabled state
sp_configure 'clr enabled', 1
GO
RECONFIGURE
GO

Now to access the assembly into our MSSQL Server we have to register it first

--REGISTER CLASS LIBARIES IN SQL SERVER
CREATE ASSEMBLY ASSEMBLYFUNCTIONS 
FROM 'E:\personal\projects\AssemblyFunctions\AssemblyFunctions\bin\Debug\AssemblyFunctions.dll'
WITH PERMISSION_SET = SAFE
GO

To drop that assembly use the following commands

--DROP/UN-REGISTER THE ASSEMBLY 
DROP ASSEMBLY ASSEMBLYFUNCTIONS
GO

Now to access our functions we have to first register our functions, procedures or what ever is there

--REGISTER USER DEFINED FUNCTION IN SQL SERVER 
CREATE FUNCTION TITLECASE(@DATA NVARCHAR(MAX)) RETURNS NVARCHAR(MAX)
AS EXTERNAL NAME AssemblyFunctions.[AssemblyFunctions.MySQLFunctions].TitleCase  GO

Since now all the things are done you can call your respective function

Select dbo.TitleCase('sample')
go