ArcMapAddinCoordinateConversion.DockableWindowCoordinateConversion.GetSR C# (CSharp) Method

        private ISpatialReference GetSR()
        {
            Type t = Type.GetTypeFromProgID("esriGeometry.SpatialReferenceEnvironment");
            System.Object obj = Activator.CreateInstance(t);
            ISpatialReferenceFactory srFact = obj as ISpatialReferenceFactory;

            // Use the enumeration to create an instance of the predefined object.

            IGeographicCoordinateSystem geographicCS =
                srFact.CreateGeographicCoordinateSystem((int)
                esriSRGeoCSType.esriSRGeoCS_WGS1984);

            return geographicCS as ISpatialReference;
        }