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Here’s a sample code snippet demonstrating how to get the connection string from your ASP.NET web.config file so that you can make a connection to the database.
How to read connection string from web.config in ASP.NET and C# ?
Assume that the connection string name defined in the web.config file is “conn1” , you would get the connection string using the ConnectionManager class.
var connectionStr = System.Configuration.ConfigurationManager.ConnectionStrings["conn1"].ConnectionString;