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>how to connect database in c#
You need to create an instance Connection class. This instance then uses connect information (connectionString) - database servername, userid, password and database name to connect.
Create a new instance for the database.Here is an example
SqlConnection cn = new SqlConnection();
cn.ConnectionString = "Data Source=(yourserver)\\SQLEXPRESS;Initial Catalog=(your databasename);Integrated Security=True;Pooling=False";
cn.Open();
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