/// <summary>
            /// Builds a <see cref="XlsExporter"/>.
            /// </summary>
            /// <returns>Returns a <see cref="XlsExporter"/>.</returns>
            public XlsExporter Build()
            {
                XlsExporter instance = this.instance;

                this.instance = null;
                return(instance);
            }
 private Builder()
 {
     this.instance = new XlsExporter();
 }