Fix Error - Non-invocable member 'System.Configuration.ConfigurationManager.ConnectionStrings' cannot be used like a method.

C# - Non-invocable member 'System.Configuration.ConfigurationManager.ConnectionStrings' cannot be used like a method.


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To fix it replace
System.Configuration.ConfigurationManager.ConnectionStrings("DefaultConnection").ToString();
With
System.Configuration.ConfigurationManager.ConnectionStrings["DefaultConnection"].ToString();