title: how to read azure app config values in C# startup.cs class in azure function
body: <p>I have added key value pair in Azure app Configuration and trying to read it in Startup.cs class file.
  Please suggest how to do that.</p>
  <pre><code>public class Startup : FunctionsStartup
  {
      private static readonly string url= &quot;*******************&quot;;
     
      public override void ConfigureAppConfiguration(IFunctionsConfigurationBuilder builder)
      {
          string connectionString=????? //How to get this value from Azure app config
          builder.Services.AddDbContext&lt;DbContext, Context&gt;(
              options =&gt; SqlServerDbContextOptionsExtensions.UseSqlServer(options, connectionString));
         builder.ConfigurationBuilder.AddAzureAppConfiguration(url);
      }
  }
  </code></pre>