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Convert Powerpoint file into Image file

sfsdfs
using Microsoft.Office.Interop.PowerPoint;
using Microsoft.Office.Core;
using System.IO;

try
        {
            FileInfo objfile = new FileInfo(FileUpload1.PostedFile.FileName);
            if (objfile.Extension.Equals(".ppt"))
            {
                ApplicationClass pptApplication = new Microsoft.Office.Interop.PowerPoint.ApplicationClass();
                Presentation pptPresentation = pptApplication.Presentations.Open(objfile.FullName, MsoTriState.msoFalse, MsoTriState.msoFalse, MsoTriState.msoFalse);
                pptPresentation.Export(objfile.FullName, "jpg", Int32.Parse(pptPresentation.SlideMaster.Width.ToString()), Int32.Parse(pptPresentation.SlideMaster.Height.ToString()));
            }
            else
            {
                Response.Write("Please choose PowerPoint files only");
            }
        }
        catch (Exception ex)
        {
        }
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