Develop Reference

Can't connect to SQL Server Express via IP address - c#

I moved from SQL Server 2014 to SQL Server Express (free version) and since then I can't connect to database using SqlConnection with IP.
I can connect local with connection string but when I am using an ip address I get error number 10061, I checked whole net about that error and verified all the issues mentioned: remote connection is allowed, I added port in firewall, enabled tcp in server...
In official version of SQL Server it works fine, but when I moved to EXPRESS free version I can't successfully connect remotely any more.
This is the connection string I use:
SqlConnection cn = new SqlConnection(#"user id = ***; password=***;server=192.168.1.102,1433; Trusted_Connection=no; database=myDatabase; connection timeout=30");
Getting exception error number 10061.
But when I use the local connection string:
SqlConnection cn = new SqlConnection(#"server=ASUS\SQLEXPRESS ;database=myDatabase;user id = ***; password=***;");
That works fine...
What can the problem be?

You still need to specify the instance name when switching to using the I.P to connect.
SqlConnection cn = new SqlConnection(#"user id = ***;
password=***;
server=192.168.1.102\SQLEXPRESS;
Trusted_Connection=no;
database=myDatabase; connection timeout=30");

I should have set the port and ip in server configuration manager.

Proper structure of Connection string in C#

What should be the proper structure of Connection string in C# to access SQL Server 2008 R2 over internet using the public ip of the server ?
I used the below connection string . It works fine within our network using local IP but when i am trying to acces it over internet with public IP, I am getting error.
SqlConnection con = new SqlConnection("Data Source=tcp:192.168.0.16,49582;Initial Catalog=TrulyDB;uid=sa;pwd=sa#pass123;");

There are different ways to Create Connection String which depends on
Authentication type as you know
1.> Windows Authentication
2.> SQL Server Authentication
Follow this link

SqlConnection con = new SqlConnection("Data Source=192.168.0.16,49582;Network Library=DBMSSOCN;Initial Catalog=TrulyDB;uid=sa;pwd=sa#pass123;");

Can not connect to local database with c# System.Data.SqlClient

I have some problems with connecting to my local DB using c# System.Data.SqlClient.
Information:
DB parameters: Name:baza Host:localhost Instance:baza Port:3306 Schema:world
My connection string: #"server=localhost\baza;password=pass;User Id=root;database=world;Persist Security Info=True"
using: c#, System.Data.SqlClient, MySQL Workbench
firewall off
succesfull conection with JDBC, so server is working
JDBC parameters:
String url = "jdbc:mysql://localhost:3306/";
String driver = "com.mysql.jdbc.Driver";
String dbName = "world";
String username = "root";
String pass = "pass";
Problem:
when I use conn.Open(); this happen => (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)
Tried:
server=localhost then it gives => error: 40 - Could not open a connection to SQL Server
many other stupid combinations like server=baza
http://blogs.msdn.com/b/sql_protocols/archive/2007/05/13/sql-network-interfaces-error-26-error-locating-server-instance-specified.aspx
ASP.NET beginner question: How to get rid of this error?
Connection to freesql.org server also failed
I have no idea what to do... Sth is probably with server name.
EDIT:
code:
string connstr = #"Data Source=localhost\baza;password=qspass;User Id=root;"+
"Initial Catalog=world;Persist Security Info=True";
Console.WriteLine(connstr);
SqlConnection conn = new SqlConnection(conbuild.ConnectionString);
conn.Open();
Console.WriteLine("YO!");
Some more code...
Never reached YO! :P

I suppose I should put my answer in the answer section, rather than a comment :)
I see from your JDBC connection string that you are using MySQL rather than SQL Server.
The System.Data.SqlClient namespace is the.NET Framework Data Provider for SQL Server, not MySQL.
If you are using MySQL, you will need to use the MySQL ADO.NET driver available here:
Download Connector/Net

Error trying to establish connection to SQL Server Express

I created a web site in Visual Studio 2012 that interacts with a SQL Server Express database table where the database was created beforehand with SQL Server 2008. I added the connection with the database to the site, and all of this worked fine.
Now I am doing exactly the same with a new website but now get the error message.
System.Data.SqlClient.SqlException (0x80131904): Login failed for user ''
The error happens as I am trying to make the connection and with my previous project everything was fine and still is, exactly the same connection string was used in both cases. From where does this exception come from all of a sudden?
try
{
connectionString = "Data Source=.\\SQLEXPRESS;Initial Catalog=Employee,Integrated Security=True;";
using (conn = new SqlConnection(connectionString))
{
conn.Open();
.....
}
}
How can I resolve this?

you have invalid connection string, you have used , instead of ;
connectionString = "Data Source=.\\SQLEXPRESS;Initial Catalog=Employee;Integrated Security=True;";
// ^ here
List of Connection Strings for SQL Server 2008

windows Application Database Connection c#

Im facing problem with database connection on windows Application Database Connection c#... here is my connection ,,, PC2 is PCNAme
private static SqlConnection con = new SqlConnection(
"Data Source=PC2\\SQLEXPRESS; Initial Catalog=Database1;Integrated Security=True"
);
when I run the form I get this unhandled exception on con.Open();
sqlException was unhandeled:
A network-related or instance-specific error occurred while
establishing a connection to SQL Server. The server was not found or
was not accessible. Verify that the instance name is correct and that
SQL Server is configured to allow remote connections. (provider: SQL
Network Interfaces, error: 26 - Error Locating Server/Instance
Specified)
hope some one can help Im trying to solve it for many hours but not working.

Check this trouble shoot steps on MSDN:
The SQL Server client cannot connect to the server MSDN
And much better if you separate your connection string to your ado.net sql connection.
private const string _thisConnectionString = "Data Source=PC2\\SQLEXPRESS; Initial Catalog=Database1;Integrated Security=SSPI";
Use the "Using" Statement ensure that you always close your Connection.
Best Practices for Using ADO.NET MSDN
using (var conn = new SqlConnection(_thisConnectionString))
{
SqlCommand cmd = conn.CreateCommand();
cmd.CommandText = "Your SQL Query STuff";
conn.Open();
}
Regards

Try This:
private static SqlConnection con = new SqlConnection(
"Data Source=PC2\SQLEXPRESS; Initial Catalog=Database1;Integrated Security=True"
);

Go to SQL Server Configuration Management -> Click on SQL Server Services
Verify SQL Server and SQL Server browser both are running. you can see a Greed play button there. if it's not running right click on the service which shows Red, go to properties, Click Built in Account and Press Apply then OK, There try to start by right click.