How do I open and edit powerpoint files using asp.net

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C#

ASP.NET

PowerPoint

Hi,

How do I open and edit a powerpoint file in asp.net using C#? I have to access a library and a be able to choose a specific file. I've tried other codes but when I click to open the file, it always prompts me to either open or save the file. Is there a way to skip the open and save part?
I just want the powerpoint file to open immediately without the open and save.
I've tried using "

System.Diagnostics.Process.Start("http://it3127:30091/Shared%20Documents/Test.ppsx");

"
But it prompts me for the open and save option.

I've also used this

Microsoft.Office.Interop.PowerPoint.Application pptApp = new Microsoft.Office.Interop.PowerPoint.Application();
                        Microsoft.Office.Core.MsoTriState ofalse = Microsoft.Office.Core.MsoTriState.msoFalse;
                        Microsoft.Office.Core.MsoTriState otrue = Microsoft.Office.Core.MsoTriState.msoTrue;
                        pptApp.Visible = otrue;
                        pptApp.Activate();
                        Microsoft.Office.Interop.PowerPoint.Presentations ps = pptApp.Presentations;
                        Microsoft.Office.Interop.PowerPoint.Presentation p = ps.Open(@"http://it3127:30091/Shared%20Documents/Forms/AllItems.aspx", ofalse, ofalse, otrue);
                        //System.Diagnostics.Debug.Print(p.Windows.Count.ToString());
                        MessageBox.Show(pptApp.ActiveWindow.Caption);

"
This code is able to open the powerpoint file immediately and allow me to edit, however, the slides are filled with
words or codes, ex "masterpagefile="~masterurl/default.master" Inherits="Microsoft.sharepoint.webpartpages.webpartpage,microsoft.sharepoint,version=14.0.0.0.0, culture=neutral,publickeytoken" and all these words carry on for 30 slides.

Would really really appreciate if there is another way or a solution to this.
Look forward to your replies.

Thankyou!