I am having some connectivity issues with Visual Studio and SQL Server.
This is the connections string in my web.config file;
<connectionStrings>
<add name="WintipToysConnectionString" connectionString="Data
Source=localhost\sqlexpress;Initial Catalog=WINGTIPTOYS;Integrated
Security=True" providerName="System.Data.SqlClient" />
</connectionStrings>
According to my DB connection string found in Visual Studio, my connection string is;
Data Source=localhost\sqlexpress;Initial Catalog=WINGTIPTOYS;Integrated Security=True
Which seems to add up - but, I get this error when my program hits a certain line;
System.Data.SqlClient.SqlException: '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: 50
- Local Database Runtime error occurred. Cannot create an automatic instance. See the Windows Application event log for error details.
I am actually following the WingTipToys tutorial on the Microsoft website and I am struggling to get it to use the Database I attached to SSMS.
I can write queries inside VS which works fine. So I don't really understand why my program is having this error when running?
Thanks.
Admittedly haven't used SQLExpress in a looong time. It looks like the syntax you're using is for an "instance" - which is pointed out in the error message:
...Cannot create an automatic instance...
What you have does look like server\instance conn string syntax...
Connect to the "default" instance of SQL Express like so: Data Source=.\\SQLExpress
Refer to this:
SSE Connection string sample
Hth...
Related
I am writing a Windows Forms application, where I want to save data inside the application. For the reason I used a serviced-based database with a .mdf database file, and I use Entity Framework.
So far everything is working fine until I released the file and opened it on another computer. The application opened and everything worked fine but when it comes to the database interaction, it throws a big error like this:
************ Exception Text ************
System.Data.Entity.Core.EntityException: The underlying provider failed on Open.
System.Data.SqlClient.SqlException: 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: 50 - Local Database Runtime error occurred. The specified LocalDB instance does not exist.)
Here a screenshot of the error: https://www.dropbox.com/s/gwban6ab97c6fya/22093543_10213995193571435_760919436_n.png?dl=0
In case you need the project its uploaded to here: https://www.dropbox.com/s/ubpc683ggtihh6k/usercontrol.zip?dl=0
I have tried in so many ways but nothing is working, same thing happens for the installer version as well.
Can anyone help me on this please?
Here are my connection strings:
<add name="DatabaseEntities"
connectionString="metadata=res://*/dbModel.csdl|res://*/dbModel.ssdl|res://*/dbModel.msl;provider=System.Data.SqlClient;provider connection string="data source=(LocalDB)\MSSQLLocalDB;attachdbfilename=|DataDirectory|\Database.mdf;integrated security=True;MultipleActiveResultSets=True;App=EntityFramework""
providerName="System.Data.EntityClient" />
<add name="OPLCheque.Properties.Settings.DatabaseConnectionString"
connectionString="Data Source=(LocalDB)\MSSQLLocalDB;AttachDbFilename=|DataDirectory|\Database.mdf;Integrated Security=True"
providerName="System.Data.SqlClient" />
I'm pretty sure this post would be flagged as duplicate since a similar question has been answered multiple times already, but here you go.
You are using LocalDB which means it cannot be shared since it runs on SQL Server Express.
If you simply want a LocalDB, see this answer to implement it after publishing your WinForms app.
Basically you want to publish your app with prerequisite components so you should publish those along your application.
If you want to use a single database to be shared between instances of your application, learn how to setup one using SQL Server here.
Afterwards, learn what connection string format you should use.
Sample to connect via IP Address:
connetionString="Data Source=IP_ADDRESS,PORT;
Network Library=DBMSSOCN;Initial Catalog=DatabaseName;
User ID=UserName;Password=Password"
See this for more.
If ever you plan on using a shared database, better make sure that the connection string that your database context should use is specified.
Config:
<add name="DefaultConnection" connectionString="" providerName="" />
Database Context:
public DbContext()
: base ("DefaultConnection")
{
}
I have a simple ASP.NET C# application which works fine on the computer it was created. However, whenever this project is compiled and run on any other computer, I get the following error:
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)
On the following line:
bool admin = HttpContext.Current.User.IsInRole("Admin");
I could previously run the application on a different computer without error. I have made no changes to any SQL server settings.
In Web.config file:
<connectionStrings>
<add name="DefaultConnection" connectionString="Data Source=(LocalDb)\v11.0;AttachDbFilename=|DataDirectory|\aspnet-INT422Project-20140320070224.mdf;Initial Catalog=aspnet-INT422Project-20140320070224;Integrated Security=True" providerName="System.Data.SqlClient" />
<add name="DataContext" providerName="System.Data.SqlClient" connectionString="Data Source=(LocalDb)\v11.0;Initial Catalog=Lab5;Integrated Security=SSPI;AttachDBFilename=|DataDirectory|INT422Project.mdf" />
</connectionStrings>
Your better change your connection String value to use a real sql server database.
SQL Server Express or LocalDB is not used for production web applications because it is not designed to work with IIS.
Please check the following:
Make sure the sql server service is up and running.
Make sure the TCP/IP ports are enabled.
If both are fine, I would suggest you to read the servername and database name from the app.config/ web.config which makes life easier.
Dude, Check this answer.
https://stackoverflow.com/a/16054490/3081461
you can read more about localdb at microsoft TechNet as well :
http://technet.microsoft.com/en-us/library/hh510202.aspx
I'm new to .net world and I started to create asp.net web site.
So I Created a New Project using DexExpress template like below image
When I was run, It appear as;
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)
What is the reason for this ?
Is there any other way to use devExpress Templates ?
Sorry for wasting your valuable time for my basic problem here. Because I'm stuck here.
Thank you,
EDITED
here is my connection string,
<add name="ApplicationServices" connectionString="data source=.\SQLEXPRESS;Integrated Security=SSPI;AttachDBFilename=|DataDirectory|\aspnetdb.mdf;User Instance=true" providerName="System.Data.SqlClient"/>
<add name="DataConnectionString" connectionString="Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\Data.mdf;Integrated Security=True;User Instance=True;Connect Timeout=120" providerName="System.Data.SqlClient"/>
I suspect that either -
Instance names are not configured properly in connection string.
Or the concerned Sql Server instance is not running.
Can you please let us know which instance of Sql Server is running on your PC?
You can see SQL Server Services by typing services.msc in Run box. Please see snapshot to understand how to get instance name.
i have finished a desktop c# project in which i make use of Entity framework 5 and SQL server 2008
in my machine it's working well, but i created a virtual machine and tried to deploy it there and I have problems.
I get this error : System.Data.EntityException: The underlying provider failed on Open. --->
System.Data.SqlClient.SqlException: 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.
I used installshield for the setup and I have installed sql express in the visrual machine, during the setup I create the database and all the tables.
my connection string is this :name="BussinessContainer" connectionString="metadata=.\Bussiness.csdl|.\Bussiness.ssdl|.\Bussiness.msl;provider=System.Data.SqlClient;provider connection string="data source=localhost;initial catalog=yingyangDB;User ID=username;Password=password;integrated security=True;MultipleActiveResultSets=True;App=EntityFramework"" providerName="System.Data.EntityClient"
Should I change the connection string?
I searched a lot before posting this, but nothing worked..any help?
SQL Express (normally) doesn't create as a "Default instance" - i.e. connecting by localhost isn't sufficient to connect to the local SQL express instance.
You may need to use localhost\SQLExpress to connect to the local SQL Express instance (the instance name may be different, but usually it is not.
Additionally, you specify an Initial Catalog in your connection string, which I assume is pointing at your new DB. However you say that you create the DB during the installation - so that DB may not actually exist in your Instance yet. That may be causing it to fail out. Try taking it out of the string and see if that lets you connect.
I am trying to connect to the database but I am getting this exception:
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)
I've googled a lot, but I could not find the answer.
Here's my configuration:
I use MS SQL Server 2008 Express. Both Sql Server and Sql Server Browser use my account (I am an administrator). I've also used local system and local service. Without success.
Here is my connectionstring in app.config:
<?xml version="1.0"?>
<configuration>
<connectionStrings>
<add name="EventManagerEntities" connectionString="metadata=res://*/Entities.RelationModel.csdl|res://*/Entities.RelationModel.ssdl|res://*/Entities.RelationModel.msl;provider=System.Data.SqlClient;provider connection string="Data Source=martijn-laptop\sql2008;Initial Catalog=EventManager;Integrated Security=True;MultipleActiveResultSets=True"" providerName="System.Data.EntityClient"/>
</connectionStrings>
<startup><supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/></startup></configuration>
I've also tried to use the sql server username and password, also without success.
I am using winforms. What else can I try?
When I check netstat -an I get this:
TCP 0.0.0.0:1433 0.0.0.0:0 LISTENING
TCP [::]:1433 [::]:0 LISTENING
I don't think this is correct, right? But how do I set it right?
It cannot find instance/server. Telnet the 1433th or the configured port of martijn-laptop\sql2008 to verify its accessible
Go into the SQL Server Configuration Manager and make sure you have the protocols you want to use enabled under "SQL Server Network Configuration" > "Protocols for Sql2008"
From the error it seem like there is connectivity to database issue. Assuming this solution has been working elsewhere have you setup and connected to a different database?
Is so validate that the code generated with edmx has the correct default database connection name or that you are overriding it:
var context = new EventManagerContext("EventManagerEntities");
Or whatever the correct systax for EF is.