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Hello Sir,
My WinForms application have an error on client machine,when i login to application their are error Occured i.e., "Instance Failure".
then i tried many solutions for this error but still same error occured.plzz give me proper solution for this.Their connection string is as follows:<connectionstrings>
<add name="ABC.Properties.Settings.dbLnString"
connectionString="Data Source=NOTEBOOK\SQLEXPRESS;Initial Catalog=dbLn;User ID=sa;Password=sa1"
providerName="System.Data.SqlClient" >

What I have tried:

checked all sql services,integrated secuirity=true in connection strings,many times changed data source name ,But still this error occured
Posted 9-Nov-17 11:01am
Updated 9-Nov-17 11:20am

1 solution

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Solution 1

Check that connection string: Simple SQL Connection String Creation[^]
Without the exact error message we can't be sure, but the instance it's referring to is almost certainly the SQL Server instance - which means your connection string is failing.
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