récupérer le nom des serveur sql serveur de mon ordinateur

namespace Test.SQLDocumentor
{
        /// <summary>
        /// Summary description for SQLInfoEnumerator.
        /// This class Enumerates a network for SQL Server instances and returns a list.
        /// For a given SQL Server instance a list of all available databases is returned
        /// For more information see
        /// http://msdn.microsoft.com/library/default.asp?url=/library/en-us/odbc/htm/odbcsqlbrowseconnect.asp
        /// http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dncscol/html/csharp09192002.asp
        ///
        /// </summary>
        public class SQLInfoEnumerator
        {
                #region ODBC32 external function definitions
                [DllImport("odbc32.dll")]private static extern short SQLAllocHandle( short handleType, IntPtr inputHandle, out IntPtr outputHandlePtr );
                [DllImport("odbc32.dll")]private static extern short SQLSetEnvAttr( IntPtr environmentHandle, int attribute, IntPtr valuePtr, int stringLength );
                [DllImport("odbc32.dll")]private static extern short SQLFreeHandle( short hType, IntPtr Handle );
                [DllImport("odbc32.dll",CharSet=CharSet.Ansi)]private static extern short SQLBrowseConnect( IntPtr handleConnection, StringBuilder inConnection, short stringLength, StringBuilder outConnection, short bufferLength, out short stringLength2Ptr );
                #endregion
                #region Constants
                private const string SQL_DRIVER_STR = "DRIVER=SQL SERVER";
                private const short SQL_SUCCESS = 0;
                private const short SQL_HANDLE_ENV = 1;
                private const short SQL_HANDLE_DBC = 2;
                private const int SQL_ATTR_ODBC_VERSION = 200;
                private const int SQL_OV_ODBC3 = 3;
                private const short SQL_NEED_DATA = 99;
                private const short DEFAULT_RESULT_SIZE = 1024;
                private const string START_STR ="{";
                private const string END_STR ="}";
                #endregion
               
                /// <summary>
                /// A string to hold the selected SQL Server
                /// </summary>
                string m_SQLServer;
                /// <summary>
                /// A string to hold the username
                /// </summary>
                string m_Username;
                /// <summary>
                /// A string to hold the password
                /// </summary>
                string m_Password;
                /// <summary>
                /// Property to set the SQL Server instance
                /// </summary>
                public string SQLServer
                {
                        set{m_SQLServer=value;}
                }
                /// <summary>
                /// Property to set the Username
                /// </summary>
                public string Username
                {
                        set{m_Username=value;}
                }
                /// <summary>
                /// Property to set the Password
                /// </summary>
                public string Password
                {
                        set{m_Password=value;}
                }
               
                /// <summary>
                /// Enumerate the SQL Servers returning a list (if any exist)
                /// </summary>
                /// <returns></returns>
                public string[] EnumerateSQLServers()
                {
                        return RetrieveInformation(SQL_DRIVER_STR);
                }
                /// <summary>
                /// Enumerate the specified SQL server returning a list of databases (if any exist)
                /// </summary>
                /// <returns></returns>
                public string[] EnumerateSQLServersDatabases()
                {
                        return RetrieveInformation(SQL_DRIVER_STR+";SERVER="+ m_SQLServer+";UID=" + m_Username +";PWD=" +m_Password);
                }

                /// <summary>
                /// Enumerate for SQLServer/Databases based on the passed information it the string
                /// The more information provided to SQLBrowseConnect the more granular it gets so
                /// if only DRIVER=SQL SERVER passed then a list of all SQL Servers is returned
                /// If DRIVER=SQL SERVER;Server=ServerName is passed then a list of all Databases on the
                /// servers is returned etc
                /// </summary>
                /// <param name="InputParam">A valid string to query for</param>
                /// <returns></returns>
                private string[] RetrieveInformation(string InputParam)
                {
                        IntPtr m_environmentHandle=IntPtr.Zero;
                        IntPtr m_connectionHandle = IntPtr.Zero;
                        StringBuilder inConnection = new StringBuilder(InputParam);
                        short stringLength= (short)inConnection.Length;
                        StringBuilder outConnection = new StringBuilder(DEFAULT_RESULT_SIZE);
                        short stringLength2Ptr= 0;
                               
                        try
                        {      
                                if (SQL_SUCCESS == SQLAllocHandle(SQL_HANDLE_ENV, m_environmentHandle, out m_environmentHandle))
                                {
                                        if (SQL_SUCCESS == SQLSetEnvAttr(m_environmentHandle,SQL_ATTR_ODBC_VERSION,(IntPtr)SQL_OV_ODBC3,0))
                                        {
                                                if (SQL_SUCCESS == SQLAllocHandle(SQL_HANDLE_DBC, m_environmentHandle, out m_connectionHandle))
                                                {
                                                        if (SQL_NEED_DATA == SQLBrowseConnect(m_connectionHandle, inConnection, stringLength, outConnection, DEFAULT_RESULT_SIZE, out stringLength2Ptr))
                                                        {
                                                                if (SQL_NEED_DATA != SQLBrowseConnect(m_connectionHandle, inConnection, stringLength, outConnection, DEFAULT_RESULT_SIZE, out stringLength2Ptr))
                                                                {
                                                                        throw new ApplicationException("No Data Returned.");
                                                                }
                                                        }
                                                }      
                                        }
                                }
                        }
                                               
                        catch (Exception ex)
                        {                      
                                throw new ApplicationException("Cannot Locate SQL Server.");
                        }
                        finally
                        {
                                FreeConnection(m_connectionHandle);
                                FreeConnection(m_environmentHandle);
                        }
                        if (outConnection.ToString()!="")
                        {return ParseSQLOutConnection(outConnection.ToString());}
                        else{return null;}
                       
                       
                }
                /// <summary>
                /// Parse an outConnection string returned from SQLBrowseConnect
                /// </summary>
                /// <param name="outConnection">string to parse</param>
                /// <returns></returns>
                private string[] ParseSQLOutConnection(string outConnection)
                {
                        int m_Start = outConnection.IndexOf(START_STR) + 1;
                        int m_lenString = outConnection.IndexOf(END_STR) - m_Start;
                        if((m_Start>0) &&(m_lenString>0))
                        {outConnection = outConnection.Substring(m_Start,m_lenString);}
                        else
                        { outConnection = string.Empty;}
                        return outConnection.Split(",".ToCharArray());
                }
                private void FreeConnection(IntPtr handleToFree)
                {
                                if(handleToFree!= IntPtr.Zero)
                                                SQLFreeHandle(SQL_HANDLE_DBC,handleToFree);
                }
               
        }
}