Can not add a localDB in my website - asp.net

I installed visual studio2015 then when
I tried to add a database file to my project but every time i tried to do it this message show up
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.
) (Microsoft SQL Server 2012)

Related

ASP.NET giving SQL Server errors. Possibly due to no log's configured on SQL Server Express

When I run my ASP.NET application I get this error in my browser:
The application could not connect to the database, please check the connection string in the web.config file and SQL server availability.
Original 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: 25 - Connection string is not valid)
I checked Event Viewer and found this error:
initerrlog: Could not open error log file ''. Operating system error = 3(The system cannot find the path specified.).
I have SQL Server Express 2019 installed on my laptop so I checked SQL Server Configuration Manager and found the SQL Server process wasn't running so I tried to start it. It failed with this error:
Right now I'm assuming it's all part of the same issue.
I checked the start up parameters expecting to see something like -eC:\Program Files\Microsoft SQL Server\MSSQL15.MSSQLSERVER\MSSQL\Log\ERRORLOG but there was no parameters and when I tried to add the the Add button greyed out.
I'm also unable to connect through SSMS:
TITLE: Connect to Server
Cannot connect to DESKTOP-GK2MRBG.
ADDITIONAL INFORMATION:
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: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server) (Microsoft SQL Server, Error: 2)
For help, click: http://go.microsoft.com/fwlink?>ProdName=Microsoft%20SQL%20Server&EvtSrc=MSSQLServer&EvtID=2&LinkId=20476
The system cannot find the file specified
BUTTONS:
OK
How do I resolve this?

How do I create a database?

I am trying to create a database in my visual studio project, but each time I try and error message pops up; here is the error message i get in my visual studio:
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.)
What should I do?
Often when SQL Server is installed, you can not connect to it using TCP IP.
You will have to enable it.
Here is a link how to: https://learn.microsoft.com/en-us/sql/database-engine/configure-windows/enable-or-disable-a-server-network-protocol?view=sql-server-2017

Why is the error showing "SqlException was unhandled by user code"?

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. Specified LocalDB instance name is invalid.
I have searched couple of times; but could not solve this problem.
You connection string is wrong so it cannot connect to the SQL server. It is saying the localdb instance name is wrong so it cannot connect.
This thread will help you find out the localdb instances on your computer
SQL Server: How to find all localdb instance names

SQL Server not connecting via IIS

I am getting the following error when I deploy my application to IIS:
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: Named
Pipes Provider, error: 40 - Could not open a connection to SQL
Server)]
What is interesting about this is that it is happening at the folder level. I have the same application, running on the same IIS server and it connects to the SQL server without issue - and the complied code is the same. The only difference is the folder that has the content. I am leaning towards a permission issue - but I did not change any of those.

getting error while connecting microsoft sql server

I had installed Microsoft SQL Server Management Studio Express.But after installation when i connect the SQL server I am getting the following error.
TITLE: Connect to Server
Cannot connect to S-PC.
ADDITIONAL INFORMATION:
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: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server) (Microsoft SQL Server, Error: 2)
Please suggest me something to remove this error.
It looks as if the service is not running. Run Services.msc, find SQL Server (MSSQLSERVER) in the services list and click on Start Service button.

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