Use Openoffice convert doc to pdf

When I change a large number of files into form of PDF using OpenOffice, the memory of soffice.bin process is continued to increase. When it ups to a certain extent, the conversion of soffice.bin is failed. Every time, after transformed a file, I always run XComponent to dispose. Why the memory will be growing?

public static void fileconverter(XComponentContext xContext,  int min, int max)
     {
         PropertyValue[] propertyValues = new PropertyValue[1];
         propertyValues[0] = new unoidl.com.sun.star.beans.PropertyValue();
         propertyValues[0].Name = "Hidden";
         propertyValues[0].Value = new uno.Any(true);

         unoidl.com.sun.star.beans.PropertyValue[] propertyValue2 =
            new unoidl.com.sun.star.beans.PropertyValue[2];
         propertyValue2[0] = new unoidl.com.sun.star.beans.PropertyValue();
         propertyValue2[0].Name = "Overwrite";
         propertyValue2[0].Value = new uno.Any(true);
         propertyValue2[1] = new unoidl.com.sun.star.beans.PropertyValue();
         propertyValue2[1].Name = "FilterName";
         propertyValue2[1].Value = new uno.Any("writer_pdf_Export");

         for (int i = min; i < max; i++)
         {
             XMultiServiceFactory xMCF = (unoidl.com.sun.star.lang.XMultiServiceFactory)xContext.getServiceManager();

             XComponentLoader xCompLoader = (XComponentLoader)xMCF.createInstance("com.sun.star.frame.Desktop");
             string inputFile = AppDomain.CurrentDomain.BaseDirectory + "1.docx";
             string sUrl = PathConverter(inputFile);
             string outputDir = AppDomain.CurrentDomain.BaseDirectory + "Test" + i.ToString() + ".pdf";

             XComponent xComponent = xCompLoader.loadComponentFromURL(sUrl, "_blank", 0, propertyValues);

             string sOutUrl = PathConverter(outputDir);

             int index1 = sUrl.LastIndexOf('/');
             int index2 = sUrl.LastIndexOf('.');

             ((XStorable)xComponent).storeToURL(sOutUrl, propertyValue2);

             xComponent.dispose();
         }

     }

Tags: C#, OpenOffice, PDF