Primera versión

bdHerramientaCACOA/extensiones/DoubleExtensions.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Runtime.CompilerServices;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace bdHerramientaCACOA.extensiones
+{
+    public static class DoubleExtensions
+    {
+        public static double DosDecimales(this double value)
+        {
+            return Math.Round(value, 2, MidpointRounding.AwayFromZero);
+        }
+    }
+}

bdHerramientaCACOA/extensiones/StringExtensions.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace bdHerramientaCACOA.extensiones_string
+{
+    public static class StringExtensions
+    {
+        public static string MilesYDecimales(this double str)
+        {
+            return str.ToString("#,0.00", System.Globalization.CultureInfo.GetCultureInfo("es-ES"));
+        }
+
+        public static string MilesYDecimales(this double? str)
+        {
+            return str?.ToString("#,0.00", System.Globalization.CultureInfo.GetCultureInfo("es-ES"));
+        }
+    }
+}