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Fastest and right way to check if I have a connection to SQL Server in C#

I just want to check if I have a connection to a SQL Server for a sync my local database to it. And if I don't have to skip on it.
Also, it should work with wifi and cable connection.
When it connects with wifi some time my network is off but the method
System.Net.NetworkInformation.NetworkInterface.GetIsNetworkAvailable()
returns true so this method does not work well for me.
I also try just to check the connection to my SQL Server like that
public bool TestServerConnection()
{
using (SqlConnection openCon = new SqlConnection(connectionString))
{
try
{
string saveStaff = "select 1";
SqlCommand command = new SqlCommand(saveStaff, openCon);
command.CommandTimeout = 1;
openCon.Open();
if (openCon.State == ConnectionState.Open)
{
return true;
}
else
{
return false;
}
}
catch (Exception)
{
return false;
}
}
}
With this connection string
Data Source=CV-TED-SQL1;Initial Catalog = PulserDb; Integrated Security=true;MultipleActiveResultSets=True;
But when I have no connection for example when I change Data Source=CV-TED-SQL1; to Data Source=CV-TED-SQL11;, the openCon.Open(); takes about 10 seconds..
That just too long..
There is any fastest way to do that?
I can't change my connection string, maybe I can change it only for my method and change it back when this method end
Thanks for the help.
EDITING A NEW TEST METHOD
public bool TestServerConnection()
{
Stopwatch stopwatch = Stopwatch.StartNew();
string tempCS = connectionString;
SqlConnectionStringBuilder scb = new SqlConnectionStringBuilder(tempCS);
scb.ConnectTimeout = 1;
using (SqlConnection openCon = new SqlConnection(scb.ToString()))
{
try {
string saveStaff = "select 1";
SqlCommand command = new SqlCommand(saveStaff, openCon)
{
CommandTimeout = 1
};
openCon.Open();
if (openCon.State == ConnectionState.Open)
{
stopwatch.Stop();
return true;
}
else
{
stopwatch.Stop();
return false;
}
}
catch (Exception)
{
stopwatch.Stop();
return false;
}
}
}

If you cannot change the connection string to add a Connect Timeout key then you can change the connection string at runtime with little effort using the SqlConnectionStringBuilder as shown below
SqlConnectionStringBuilder scb = new SqlConnectionStringBuilder(connectionString);
scb.ConnectTimeout = 5; // 5 seconds wait 0 = Infinite (better avoid)
connectionString = scb.ToString();
Console.WriteLine(connectionString);
using(SqlConnection cnn = new SqlConnection(connectionString)
{
}

MySQL port forwading in SSH.NET - An attempt was made to access a socket in a way forbidden by its access permissions

Installed Plesk on my VS. After this I can't setup SSH-tunnel to get data from other server-database. Using SSH.NET with below code. (This code works locally). Configured to allow communication for port 3306 in Plesk firewall. Any suggestions on how to solve this issue?
Error:
[SocketException (0x271d): An attempt was made to access a socket in a
way forbidden by its access permissions]
Code:
DataTable dt = new DataTable();
string IP = "ssh.xxxxxxxx.xxx";
string Username = "xxxxxxxxxx";
string password = "xxxxxxxxxx";
var connInfo = new Renci.SshNet.PasswordConnectionInfo(IP, Username, password);
using (var sshClient = new Renci.SshNet.SshClient(connInfo))
{
sshClient.Connect();
if (sshClient.IsConnected)
{
Renci.SshNet.ForwardedPortLocal port =
new Renci.SshNet.ForwardedPortLocal("127.0.0.1", 3306, "xxxxxxxx", 3306);
sshClient.AddForwardedPort(port);
port.Start();
using (MySqlConnection con = new MySqlConnection("SERVER=127.0.0.1;PORT=3306;UID=xxxxxx;PASSWORD=xxxxxxx;DATABASE=xxxxxxx; convert zero datetime=True"))
{
string tmpsql = "Select fname,lname,username FROM tbluser Where id=#id";
using (MySqlCommand cmd = new MySqlCommand(tmpsql, con))
{
MySqlDataAdapter da = new MySqlDataAdapter(cmd);
cmd.Parameters.AddWithValue("id", MySqlDbType.Int16).Value = UserID;
da.Fill(dt);
}
}
}
sshClient.Disconnect();
}

The local port which you are trying to forward is most probably already used by another application (like a local MySQL database server).
Use another port. Or even better, let the system pick any free local port:
var port = new ForwardedPortLocal("127.0.0.1", "dbserver.example.com", 3306);
client.AddForwardedPort(port);
port.Start();
var connectionString =
$"SERVER={port.BoundHost};PORT={port.BoundPort};" +
"UID=xxxxxx;PASSWORD=xxxxxxx;DATABASE=xxxxxxx; convert zero datetime=True";
using (MySqlConnection con = new MySqlConnection(connectionString))
{
// ...
}
Related: C# SSH tunnel Postgres database connection

ORA 12569 Packet checksum failure

I am trying to connect to Oracle database on a remote server (on cloudapp) using an ssh key pair authentication method. I can connect to the server with this code.
PrivateKeyFile keyFile = new PrivateKeyFile(#"D:\ssh.ppk");
var keyFiles = new[] { keyFile };
var username = "Admin";
var methods = new List<AuthenticationMethod>();
methods.Add(new PrivateKeyAuthenticationMethod(username, keyFiles));
var con = new ConnectionInfo("abc.xyz.net", 22, username, methods.ToArray());
using (var client = new SshClient(con))
{
client.Connect();
if (client.IsConnected)
{
var portForwarded = new ForwardedPortLocal("127.0.0.1", 3306, "127.0.0.1", 3306);
client.AddForwardedPort(portForwarded);
portForwarded.Start();
var connectionString = "DATA SOURCE=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=127.0.0.1)(PORT=3306)))(CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME=ABC_DB)));PASSWORD=myPassword;USER ID=myUsername";
//var connectionString = "DATA SOURCE=127.0.0.1:3306/ABC_DB;PASSWORD=myPassword;USER ID=myUsername";
using (OracleConnection conn = new OracleConnection(connectionString))
{
//conn.Open();
using (OracleCommand com = new OracleCommand("SELECT * FROM Table_Name", conn))
{
com.CommandType = CommandType.Text;
DataSet ds = new DataSet();
OracleDataAdapter da = new OracleDataAdapter(com);
da.Fill(ds);
GridView1.DataSource = ds;
GridView1.DataBind();
}
}
client.Disconnect();
}
else
{
Console.WriteLine("Client cannot be reached...");
}
}
When I try to connect to the database it throws an exception packet checksum failure at the line da.Fill(ds);.
Can you please help me if you know what settings need to be changed, where.
Thanks in advance.

12569, 00000, "TNS:packet checksum failure"
Cause: The data received is not the same as the data sent.
Action: Attempt the transaction again. If the error is persistent, turn on tracing and reexecute the operation.
There must be mismatch on the tcp packet between server and client. You have to enable tracing on both sites, server and client.
Contact Network Administrators to fix packet problem on the basis of trace information.
References:
Tracing Error Information for Oracle Net Services
Getting ORA-12569: TNS:Packet Checksum Failure While Trying To Connect Through Client. (Doc ID 257793.1)

C# OleDBConnection connecting to previous IP?

I have multiple databases (30+) that are used at clinics and setup automatically via the license software they use. So each database is named the same and use the same port, the only thing that changes is the IP. That being said, I am using the following code to attempt to run a query against them individually. However, when I change out the IP and run the script again it is returning the results from the previous server.
using System;
using System.Diagnostics;
using System.Data.OleDb;
namespace ConnectionTest
{
class Program
{
static void Main(string[] args)
{
using (OleDbConnection conn = new OleDbConnection("Provider=SAOLEDB.10;LINKS=tcpip(host=X.X.X.X,PORT=2638);ServerName=EAGLESOFT;Integrated Security = True; User ID = dba; PWD = sql"))
{
try
{
conn.Open();
using (OleDbCommand cmd = new OleDbCommand("SELECT tran_num, provider_id, tran_date FROM transactions WHERE tran_date LIKE '2015-11-23%'", conn))
{
using (OleDbDataReader reader = cmd.ExecuteReader())
{
while (reader.Read())
{
Console.WriteLine("{0}|{1}|{2}", reader.GetValue(0).ToString(), reader.GetValue(1).ToString(), reader.GetValue(2).ToString());
}
}
}
}
catch (Exception connerr) { Debug.WriteLine(connerr.Message); }
conn.Close();
}
if (Debugger.IsAttached)
{
Console.ReadLine();
}
}
}
}

I don't see any reason why you would be getting previous results, here. Are you running multiple instances of this code at the same time? Are you manually changing the IP address in your code each time? I assume the "Transactions" object is an actual table and not something being generated on-the-fly?
With just a tiny bit of modification, you could pass the IP address as a command line parameter:
static void Main(string[] args)
{
string ip, port = null;
for (int i = 0; i < args.Length; i++)
{
if (args[i].StartsWith("/i:"))
ip = args[i].Substring(args[i].IndexOf(':') + 1);
else if (args[i].StartsWith("/p:"))
port = args[i].Substring(args[i].IndexOf(':') + 1);
}
// Default the port value to 2638 (since I have no idea if that changes).
if (string.IsNullOrEmpty(port))
port = "2638";
string connStr = string.Format("Provider=SAOLEDB.10;LINKS=tcpip(host={0},PORT={1});ServerName=EAGLESOFT;Integrated Security = True; User ID = dba; PWD = sql", ip, port);
using (OleDbConnection conn = new OleDbConnection(connStr))
{
try
{
conn.Open();
if (conn.State != System.Data.ConnectionState.Open)
// You could also implement a WHILE loop with a small delay (~1200ms) and try again to open the connection, with a counter to "fail" after a certain number (like 3) of attempts.
throw new Exception("Unable to open connection to database.");
using (OleDbCommand cmd = new OleDbCommand("SELECT tran_num, provider_id, tran_date FROM transactions WHERE tran_date LIKE '2015-11-23%'", conn))
using (OleDbDataReader reader = cmd.ExecuteReader())
while (reader.Read())
Console.WriteLine("{0}|{1}|{2}", reader.GetValue(0).ToString(), reader.GetValue(1).ToString(), reader.GetValue(2).ToString());
}
catch (Exception connerr)
{ Debug.WriteLine(connerr.Message); }
finally
{ conn.Close(); }
}
if (Debugger.IsAttached)
{
Console.ReadLine();
}
}

First and foremost (for testing purposes, that is) I would probably try removing the ServerName parameter since you're already providing an IP address explicitly.
So your connection string would be:
Provider=SAOLEDB.10;LINKS=tcpip(host=X.X.X.X,PORT=2638);Integrated Security = True; User ID = dba; PWD = sql
Similar to ORA files, DSNs, etc, it almost sounds like you have a server alias configured for EAGLESOFT that may be overwriting the IP preference in your testing.

Make sure you change EagleSoft as well as IP. You have to pass the IP address as an arg[]. Modify code as below to allow the IP to change
string host = "X.X.X.X";
string conStr = string.Format("Provider=SAOLEDB.10;LINKS=tcpip(host={0},PORT=2638);ServerName=EAGLESOFT;Integrated Security = True; User ID = dba; PWD = sql", host);
using (OleDbConnection conn = new OleDbConnection(conStr))
​

API for updating a confluence page with table from a sql server for c#

I am able to login to the confluence page. I want to update the page with details from a table in sql server i.e., I want the table present in my sql server to appear on the confluence page. Please help! I have tried several things but in vain. This is my code. Thanks!
try
{
ConfluenceSoapServiceService oWikiUpdateService = new ConfluenceSoapServiceService();
String sLoginToken = String.Empty;
try
{
sLoginToken = oWikiUpdateService.login(confluenceLogin, confluencePassword);
}
catch
{
Console.WriteLine("Login attempt failed");
}
RemotePage oPage = oWikiUpdateService.getPage(sLoginToken, pageID);
SqlConnectionStringBuilder csb = new SqlConnectionStringBuilder();
csb.DataSource = server;
csb.InitialCatalog = database;
csb.IntegratedSecurity = true;
string connString = csb.ToString();
string queryString = "select * from XMLCatalogServer";
using (SqlConnection connection = new SqlConnection(connString))
using (SqlCommand command = connection.CreateCommand())
{
command.CommandText = queryString;
connection.Open();
using (SqlDataReader reader = command.ExecuteReader())
{
while (reader.Read())
{
//Send these to your WinForms textboxes
string SSAS_server = reader["Server"].ToString();
string cpu = reader["CPU#"].ToString();
string memory = reader["RAMSizeInGb"].ToString();
string totalSpace = reader["TotalDiskSpaceInGb"].ToString();
string ver = reader["SSASVersion#"].ToString();
string edition = reader["SSASEdition"].ToString();
string env = reader["Environment"].ToString();
string app = reader["Application"].ToString();
}
}
}
oWikiUpdateService.logout(sLoginToken);
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
Console.WriteLine(ex.StackTrace);
}
Console.Read();