SQL Server | Error Fix | A network related or instance specific error (Local_DB)

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Fix For Error:
Unhandled exception has occurred in your application. if you click Continue, the application will ignore this error and attempt to continue. if you click Quit, the application will close imminently.
A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connection.(Provider: SQL Network Interfaces, Error:52 - Unable to locate a Local Database Runtime installation. Verify that SQL Server Express is properly installed and that the Local Database Runtime feature is enabled.)

Intall SQL Server & Management Studio:

Convert Your Database To A LocalDB:

Cannot Connect To SQL Server (Error Fix):

CONNECTION STRING:
string domain = (AppDomain.CurrentDomain.BaseDirectory).ToString();

Note that:
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but my problem is that my program use Microsoft SQL Server Management System Studio 18.. so what a way to fix it?

fazrihakim
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God Please you, You help me fix my issue thx Bro

mohamedabouelela
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I'm also face this error in my client computer, i install Only SQl local db for SQL server 2014 but i dont want to install Complete SQL server on my clint computer i need just local Db so my application work with Databse without SQL server, please tell me any solution if you have thanks alot

pixemsoft
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so, i using sql 2019 express, how can i fix this

tannguyennhat
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