Answer Posted / nishanthini.r

ConnectionString:Instead of defining a connection string
on each page, you write it once it the web.config and can
reference it from all other pages.
AppSetting:Not only for defining connection u can give any
key value and name it...but connectionString is meant only
for defining path.
<appSettings>
<add key="MyKey" value="00989-00657-45678-34267"/>
</appSettings>

<ConectionStrings>
<add name="MyConnection" ConnectionString="Connection path
which u have to privide">
</ConnectionStrings>

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