diff --git a/MapProjections/Shared/GeoApiProjection.cs b/MapProjections/Shared/GeoApiProjection.cs
index 6550cc21..d44a7336 100644
--- a/MapProjections/Shared/GeoApiProjection.cs
+++ b/MapProjections/Shared/GeoApiProjection.cs
@@ -61,9 +61,9 @@ namespace MapControl.Projections
                     .CreateFromCoordinateSystems(coordinateSystem, GeographicCoordinateSystem.WGS84)
                     .MathTransform;
 
-                CrsId = (!string.IsNullOrEmpty(coordinateSystem.Authority) && coordinateSystem.AuthorityCode > 0)
-                    ? string.Format("{0}:{1}", coordinateSystem.Authority, coordinateSystem.AuthorityCode)
-                    : "";
+                CrsId = !string.IsNullOrEmpty(coordinateSystem.Authority) && coordinateSystem.AuthorityCode > 0
+                    ? $"{coordinateSystem.Authority}:{coordinateSystem.AuthorityCode}"
+                    : string.Empty;
 
                 if (CrsId == "EPSG:3857")
                 {