I was making minor modifications to a view in my ASP.NET MVC 3 C# application when all of a sudden the application would no longer run. The error message is as follows:
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: Shared Memory Provider, error: 40 - Could not open a connection to SQL Server)
Upon close inspection of the server explorer I noticed that all database connections are no longer working. I cannot expand any of the connections to view the tables and data I previously generated within. When I attempt to, there is a pop-up window that is generated that repeats the exact same error as above.
It is important to note that I was not making any modifications to any portion of the application that pertains to a database. I was rearranging some of the visual components of a view in my application when all of this occurred. I had just recently restarted my computer and had made no other modifications since that time.
At first I thought that somehow SQL Express had overwritten my development environments version of SQL Server and began to reinstall SQL Server Express. The installation fails every time now. There is no specific error. Windows generates an error message saying that the setup application "stopped working" and hangs until closed.
I have tried several different versions of the SQL Server Express installation package, and they all result in the same error happening at different points in the installation process. To be clear, I'm not even sure SQL Server Express is the problem. I don't know why it would be since I'm using the SQL Server edition that is built into Visual Studio 2010.
Is the SQL service running? Check under SQL Server Configuration Manager.
Yes, another life saved.
Run-sqlservermanager11.msc, right click and start.
Is the SQL service running? Check under the SQL Server Configuration Manager.
I assume you've already tried to repair install, to uninstall and to restart your computer, pray then try again?
Are you databases remotely deployed? Because it is possible that the network is down.
Secondly, check in the we.config file if you have specified the correct credentials. Try to log in through SQL Server Management Studio.
One more thing: Stop the SQL Server service, and start it again. Or you can reboot the system.
Related
I wrote a small app to learn more about SQL and experiment with Entity Framework. On first execution, my app creates the database locally, and after that opens the existing database. So far, so good - it works pretty well on my laptop, which has SQL Server 2017 installed.
I tried copying the assemblies to my desktop machine and that also worked as expected, though SQL Server was not installed.
But when I tried copying the assemblies to another laptop, the app would not run. The exception I saw was:
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: 52 - Unable to locate a local Database
Runtime Installation. Verify SQL Server Express is properly installed
and that the Local Database Runtime feature is enabled.)
All machines are Windows 10. (Is it significant that the desktop machine has Visual Studio 2019 installed?)
I can't seem to find a post here which speaks to my problem. (I'm probably not phrasing my query well...)
Anyway, I don't want other users to be required to install SQL Server (Express, or otherwise). What do I need to include in my installation?
Can it be done more-or-less automatically by using ClickOnce deployment (a.k.a. Publishing Wizard)? Or do I need to build an .msi with Wix code?
Is SQLite a better option for this? Users of my app will not be sharing databases; each will have their own.
I have seen mention of SQL Server Compact Edition in this post: ASP.NET MVC - Switching from SQL Server Express to Compact Edition - Connection Issue, but when I tried to run this down, it seemed like this is no longer available from Microsoft. And I believe I'm already using SQL Server Express (looks like this is confirmed by the error message, above)...
At present I have worked around this problem by using ClickOnce deployment. In the near term, I would like to change the installation to include the dependencies (.NET & SQL runtimes) in the setup package, rather than downloading them at install-time.
But I wonder if SQLite would be a better long-term solution... One thing I have appreciated about SQLServer is that I can use SQLServer Management Studio to get at the database apart from the app, so I can validate what the app has done. I also think this is a good thing for users, as they will always have a second option for getting their data, if something goes wrong with the app.
Does SQLite provide any tool similar to SQLServer Management Studio for accessing the database?
SQLite is a better option as it is an embedded database. This means that it is a part of your application and doesn't require additional setup. It works well for storing per-user data that is not shared.
https://www.sqlite.org/whentouse.html
SQLite only requires its assemblies for deployment.
SQLite deployment for .net application
I've developed a .NET (windows forms application) that i want to distribute to a friend which is not a developer. When my friend opens the generated .exe file as administrator on her computer, this error comes up.
"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 instance name is correct and that SQL
Server id configured to allow remote connections. (Provider: SQL
Network Interfaces, error: 52 - Unable to locate a Local Database
Runtime installation. Verify that SQL Express is properly installed
and that the local Database Runtime feature is enabled.)"
From the error it seems like the application crashed because the database is not installed on my friends computer. This leaves me behind with the following questions.
1) How would someone distribute a .NET application using a service-based database?
2) Should I make an installation file (visual studio 2019) that also installs the database and eventually the .NET framework. If yes, how should I do that in visual studio 2019?
3) From the word service-based database it seems like this database is running on some server somewhere? Is this server my own computer? Or can I access this server from another computer?
For the life of me I am unable to connect to my localdb hosted database created in Visual Studio 2015 to my local IIS 7 instance running on the same machine. IIS Express works fine but when I wanted to test things as a user outside of my network I dabbled with a Local copy of IIS.
I have tried everything from ensuring the app pools have the right privileges, that my connection strings are accurate and just about every thing else I have found on the web but I cannot for the life of me get this working.
The error I am getting is the following: 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 get a local application data path. Most probably a user profile is not loaded. If LocalDB is executed under IIS, make sure that profile loading is enabled for the current user.
)
Connection String in VS2015:
Any other details needed to help troubleshoot ask and I will provide.
Thank you in advance for reading.
I have developed an inventory system in C# ,database used is SQL server .Now my problem is how to deploy my project with database and run it on client's machine i have 1 more week remaining in delivering this project .I tried many blogs and sites but all in vain and i did not get any good resource which clearify me all this scenerio.The current publishing process does not have a database file and showing me an 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
Please any suggestions would be highly appreciable?
I am using Visual Studio 2013 and SQL Server 2012!
By default, SQL Server have network access disabled after a fresh install. You need to use the SQL Configuration Manager to allow remote connections to the instance.
See this post:
http://blogs.msdn.com/b/walzenbach/archive/2010/04/14/how-to-enable-remote-connections-in-sql-server-2008.aspx
http://www.romankagan.com/?p=118
If after this you still can't connect, verify that SQL Server ports are not been blocked by the machine firewall.
In the past I used to install Ms SQL 2005 in my system separately but in recent years I never care to use them anymore as I totally depend on XML tables rather than those of Ms SQL. So I never had the need for installing them.
Today, I thought of trying out using Ms SQL 2005 again in my ASP.NET project as many people suggest that its far more better than XML tables.
When installing Ms Visual Studio 2008 Professional Edition, it seems some controls of Ms SQL 2005 is included. What I could see from the "All Programs" (from start menu) is the Microsoft SQL Server 2005 Folder. Inside, I have Configuration Folder only.
Now on my Visual Studio Project, My "Server Explorer" looks like the image below.
I cannot create a database by right-clicking the Data Connection. I always get an error same as the one I get when trying to add "New connection" by clicking on "Add Connection".
Let me show you how I did using images:
Step 1: Choosing the Data Source
Q 1: Are the data source shown here are installed on my system or just the names shown by Default even if its not installed?
Step 2: Connecting to Microsoft SQL Server
The Error says: "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. (provide: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)"
Q 2: What does this mean?
My suspicion is that, this error occurred because I don't have SQL Server and my problem will be solved once I install SQL Server.
My curiosity is that, if SQL Server Database can be used even without installing SQL Server separately then why not just use it from here (Visual Studio) as some features seems to be already installed while installing Visual Studio.
Thank you for your time for caring to help me
Q1: That list does not show existing datasources, it shows available ADO.Net providers (you can think of them as database drivers).
Q2: Why did you enter "Me" as server name; is this the name of your computer? Try ".", "localhost" or "localhost\SQLEXPRESS" instead.
If you want to connect to SQL Server on your local machine, it needs to be installed on your local machine. The features installed as part of visual studio are front end management tools (depending on the version of Visual Studio installed).
Also, check out the version of SQL Server you're using for supportability purposes.
http://www.microsoft.com/en-us/sqlserver/support/support-updates.aspx
Those data sources shown in the image in Step 1 are not specific sources, they are simply types of sources. The Add Connection dialog you're looking at allows you to create a connection to, in the case that you selected Microsoft SQL Server, any MS SQL server you have access to connect to. Thus, your exact question: yes, what VS installs are simply drivers to connect to various databases, not the actual databases themselves.
Since you aren't running a MSSQL Server on your local machine, it tries to connect to your local machine to find a MSSQL server, can't, and thus gives that message. If you want to connect to a MSSQL server without installing one on your local machine, you could always find one someone else had installed on their machine and see if you could use it...