To get the Host Name and IP address in C#

using System.Net;
string getHost = System.Net.Dns.GetHostName();
string getIP = System.Net.Dns.GetHostByName(getHost).AddressList[0].ToString();

To Findout the Port no. , Server name of sql server.

DECLARE @SqlServerName VARCHAR(255)
        , @SqlVersion VARCHAR(255)
        , @PortNumber VARCHAR(10)

DECLARE @Result TABLE(ServerName VARCHAR(255), Version VARCHAR(255), Port VARCHAR(10))

SELECT @SqlServerName = @@ServerName,  @SqlVersion = LEFT(@@Version, 38)

EXEC xp_regread
    @rootkey = 'HKEY_LOCAL_MACHINE',
    @key = 'SOFTWARE\MICROSOFT\MSSQLSERVER\MSSQLSERVER\SUPERSOCKETNETLIB\TCP',
    @value_name = 'TcpPort',
    @value = @PortNumber output

Select @PortNumber,@SqlServerName ,@SqlVersion