How to resolve this error?

siva nathan Did you check DBConfiguration.ServerName and DBConfiguration.DBName Values

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public string conns = "Data Source=" + DBConfiguration.ServerName + ";Initial Catalog=" + DBConfiguration.DBName + ";Persist Security Info=True;User ID=sa;Password=openforsk;Provider=SQLOLEDB;";

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Gnanavel Sekar9y ago

Did you check whether your connectionstring is correct?

Refer below links

https://support.microsoft.com/en-us/help/328306/potential-causes-of-the-sql-server-does-not-exist-or-access-denied-error-message

https://support.microsoft.com/en-in/help/888228/you-receive-a-sql-server-does-not-exist-or-access-denied-error-message-when-you-try-to-connect-to-a-sql-server-named-instance-in-a-cluster-by-using-tcp-ip-sockets

if still getting the same share your connectionstring

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