title: how to change background color of table cell of ppt using c# code?
body: <p>I have written below piece of code to change background color of table cell of ppt using c# code but nothing is happening:</p>
  
  <pre><code>//creating powerpoint aaplication
  PowerPoint.Application pptApp = new PowerPoint.Application();
  pptApp.Visible = Office.MsoTriState.msoTrue;
  var pptPresent = pptApp.Presentations;
  var fileOpen = pptPresent.Open(@file, Office.MsoTriState.msoFalse, Office.MsoTriState.msoTrue, Office.MsoTriState.msoTrue);
  // getting first slide
  PowerPoint.Slide objSlide = fileOpen.Slides[1];
  PowerPoint.Shapes item = objSlide.Shapes;
  // getting first shape
  var shape1 = item[1];
  // check if shape is table
  if (shape1.HasTable == Office.MsoTriState.msoTrue)
  {
      // change the table cell to red color
      shape1.Table.Cell(2, 5).Shape.Fill.BackColor.RGB = System.Drawing.Color.Red.ToArgb();
      // make it visible
      shape1.Fill.Visible = Office.MsoTriState.msoTrue;
  }
  // saving the ppt
  fileOpen.SaveAs(openFolder + subStr + ".pptx",PowerPoint.PpSaveAsFileType.ppSaveAsDefault,Office.MsoTriState.msoTrue);
  // close the ppt
  fileOpen.Close();
  </code></pre>
  
  <p>Above piece of code is not working as expected, can someone help me?       </p>