I have also added the following connection string in my config file, but still there is error add name="cn" connectionString="Data Source=AMAN;Initial Catalog=HOSTSDB;User ID=SA;Password=1234 add name="FBTS.Properties.Settings.HOSTSDBConnectionString" connectionstring="Data Source=.;AttachDbFilename=C:\FBTS\FBTS\DB\HOSTSDB.mdf;Initial Catalog=HOSTS;Integrated Security=True" providername="System.Data.SqlClient" add name="cn" connectionstring="Data Source=AMAN;Initial Catalog=HOSTSDB;User ID=SA;Password=1234"
var
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