Get connection string from app.config file

參考引用:Get connection string from app.config file 
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參考 ConfigurationManager
引入 System.Configuration

Private cn As New SqlClient.SqlConnection(ConfigurationManager.ConnectionStrings("StorkConnection").ConnectionString)

...
app.config



   
   
   
connectionString="Data Source=.\SQLEXPRESS;AttachDbFilename=C:\database.mdf;Integrated Security=True;Connect Timeout=30;User Instance=True"providerName="System.Data.SqlClient"/>