" Failed to generate a user instance of SQL server due to failure in copying database files.the connection will be closed" how to solve this error?

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I have develpoed application in winforms ,but when i open n client machine there are error occured..
" failed to generate a user instance of sql server due to failure in copying database files.the connection will be closed"
please give me solution for this .My connection string and code in app.config is following,
<?xml version="1.0"?>
<configuration>

<connectionstrings>
<add name="LN.Properties.Settings.dbLnConnectionString"
connectionString="Data Source=myPC;Initial Catalog=dbLn;User ID=sa;Password=sa123;User Instance=True"
providerName="System.Data.SqlClient" />

<system.windows.forms jitDebugging="true" />

<startup><supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/>

But still this error occured,plz give me solution.i have face this problem since 15days

What I have tried:

<connectionstrings>
<add name="LN.Properties.Settings.dbLnConnectionString"
connectionString="Data Source=myPC;Attachfilename=DataDirectory|dbLn.mdf;User ID=sa;Password=sa123;User Instance=True"
providerName="System.Data.SqlClient" />

Posted 1-Dec-17 3:32am

Member 13275563

Updated 1-Dec-17 3:48am

OriginalGriff

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Comments

ZurdoDev 1-Dec-17 9:34am

You must have some code doing something weird somewhere.

Afzaal Ahmad Zeeshan 1-Dec-17 9:41am

Also, does your engine/program have enough permissions to continue and execute the tasks you are talking about?

Richard Deeming 1-Dec-17 12:53pm

REPOST
This is the same question you posted earlier:
https://www.codeproject.com/Questions/1218126/Failed-to-generate-a-user-instance-of-SQL-server-d[^]

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OriginalGriff · Answer 1 · 2017-12-01T03:48:00

As I said when you posted this earlier:

Quote:
That string doesn't look right:
"Data Source=myPC" is unlikely - you'd normally have an SQL instance name on that as well.
"Provider=..." is not a keyword SQL Server supports.

Have a look here:
Simple SQL Connection String Creation[^]
It should help you (and your client) generate a working connection.

BTW: The sa user is not recommended - you should create a user with just enough permission to to the app's job. "sa" has full access to all DB's and can do anything to the system. Using that exposes your admin login to casual users, and puts things move at risk if there is an error in your code.