Add Connection String in Web.Config File

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First option can be used for windows authentication and second option is for SQL server authentication.
1. <connectionStrings>
    <add name="CustConnectionString" connectionString="Data Source=localhost; Integrated Security=SSPI; Intial Catalog=LocalTestDB" providerName="System.Data.sqlClient"/>
</connectionStrings>

 2. <connectionStrings>
   <add name="CustConnectionString" connectionString="Data Source=localhost; uid=sa; pwd =" providerName="System.Data.sqlClient"/>
</connectionStrings>

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