How to enumerate available database Services(SQLSewrver or Oracle or MySQL or PostgreSQL, etc) in a network in C#?
<p>How to enumerate available database Services(SQL Server or Oracle or MySQL or PostgreSQL, etc) in a network using C#?</p>

<p>I also need to find their port-numbers and service-instance names.</p>

<p>For example:</p>

<pre><code>class Server
{
    #region DLL Inports
    [DllImport("odbc32.dll")]
    private static extern short SQLAllocHandle(short hType, IntPtr inputHandle, out IntPtr outputHandle);
    [DllImport("odbc32.dll")]
    private static extern short SQLSetEnvAttr(IntPtr henv, int attribute, IntPtr valuePtr, int strLength);
    [DllImport("odbc32.dll")]
    private static extern short SQLFreeHandle(short hType, IntPtr handle);
    [DllImport("odbc32.dll", CharSet = CharSet.Ansi)]
    private static extern short SQLBrowseConnect(IntPtr hconn, StringBuilder inString,
        short inStringLength, StringBuilder outString, short outStringLength,
        out short outLengthNeeded);
    #endregion

    #region Constants
    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_SUCCESS = 0;
    private const short SQL_NEED_DATA = 99;
    private const short DEFAULT_RESULT_SIZE = 1024;
    private const string SQL_DRIVER_STR = "DRIVER=SQL SERVER";
    #endregion

    #region static string[] GetServers()
    public static string[] GetNames()
    {
        string[] retval = null;
        string txt = string.Empty;
        IntPtr henv = IntPtr.Zero;
        IntPtr hconn = IntPtr.Zero;
        StringBuilder inString = new StringBuilder(SQL_DRIVER_STR);
        StringBuilder outString = new StringBuilder(DEFAULT_RESULT_SIZE);
        short inStringLength = (short)inString.Length;
        short lenNeeded = 0;

        try
        {
            if (SQL_SUCCESS == SQLAllocHandle(SQL_HANDLE_ENV, henv, out henv))
            {
                if (SQL_SUCCESS == SQLSetEnvAttr(henv, SQL_ATTR_ODBC_VERSION, (IntPtr)SQL_OV_ODBC3, 0))
                {
                    if (SQL_SUCCESS == SQLAllocHandle(SQL_HANDLE_DBC, henv, out hconn))
                    {
                        if (SQL_NEED_DATA == SQLBrowseConnect(hconn, inString, inStringLength, outString,
                            DEFAULT_RESULT_SIZE, out lenNeeded))
                        {
                            if (DEFAULT_RESULT_SIZE &lt; lenNeeded)
                            {
                                outString.Capacity = lenNeeded;
                                if (SQL_NEED_DATA != SQLBrowseConnect(hconn, inString, inStringLength, outString,
                                    lenNeeded, out lenNeeded))
                                {
                                    throw new ApplicationException("Unabled to aquire SQL Servers from ODBC driver.");
                                }
                            }
                            txt = outString.ToString();
                            int start = txt.IndexOf("{") + 1;
                            int len = txt.IndexOf("}") - start;
                            if ((start &gt; 0) &amp;&amp; (len &gt; 0))
                            {
                                txt = txt.Substring(start, len);
                            }
                            else
                            {
                                txt = string.Empty;
                            }
                        }
                    }
                }
            }
        }
        catch (Exception ex)
        {
            //Throw away any error if we are not in debug mode
            //#if (DEBUG)
            //MessageBox.Show(ex.Message,"Acquire SQL Servier List Error");
            //#endif 
            txt = string.Empty;

            throw ex;
        }
        finally
        {
            if (hconn != IntPtr.Zero)
            {
                SQLFreeHandle(SQL_HANDLE_DBC, hconn);
            }
            if (henv != IntPtr.Zero)
            {
                SQLFreeHandle(SQL_HANDLE_ENV, hconn);
            }
        }

        if (txt.Length &gt; 0)
        {
            retval = txt.Split(",".ToCharArray());
        }

        return retval;
    }
    #endregion
}
</code></pre>

<p>This code only works for SqlServers and up to WindowsXP.</p>

<p>It doesn't work for other DBMS Servers and on Win7.</p>

<p>I am in need of a canonical solution. </p>
