Deleting slides from presentation Leave feedback

using GroupDocs.Editor;
using GroupDocs.Editor.Formats;
using GroupDocs.Editor.Options;
// ...

// Load input spreadsheet to the Editor and specify loading options
using (Editor editor = new Editor("Input3Worksheets.xlsx", new SpreadsheetLoadOptions()))
{
    // Prepare edit options and set 2nd worksheet to edit
    SpreadsheetEditOptions editOptions = new SpreadsheetEditOptions();
    editOptions.WorksheetIndex = 1;//2nd worksheet to edit, here WorksheetIndex is 0-based due to historical reasons

    //generate EditableDocument with original content of 2nd worksheet
    using (EditableDocument worksheet2OpenedForEdit = editor.Edit(editOptions))
    {
        // Get the HTML-markup from the EditableDocument with original content
        string originalHtmlContentOf2ndWorksheet = worksheet2OpenedForEdit.GetEmbeddedHtml();
        
        //emulate HTML content editing in WYSIWYG-editor in browser or somewhere else
        string editedHtmlContentOf2ndWorksheet = originalHtmlContentOf2ndWorksheet.Replace("2nd row", "Edited 2nd row at 1st column");

        //generate EditableDocument with edited content of 2nd worksheet
        using (EditableDocument worksheet2AfterEdit = EditableDocument.FromMarkup(editedHtmlContentOf2ndWorksheet))
        {
            //prepare save options without deletions
            SpreadsheetSaveOptions saveOptionsWithoutDelete = new SpreadsheetSaveOptions(SpreadsheetFormats.Xlsx);
            // let it be the 2nd worksheet...
            saveOptionsWithoutDelete.WorksheetNumber = 2;//here WorksheetNumber is 1-based
            //... and we also save the original 2nd worksheet, which is pushed to the 3rd position
            saveOptionsWithoutDelete.InsertAsNewWorksheet = true;

            // So now the spreadsheet must have 4 worksheets, not 3. Save it to file
            editor.Save(worksheet2AfterEdit, "Output4Worksheets-without-delete.xlsx", saveOptionsWithoutDelete);

            // Create another save options, with deletions at this time
            SpreadsheetSaveOptions saveOptionsWithDelete = new SpreadsheetSaveOptions(SpreadsheetFormats.Xlsx);
            // let the new worksheet will be 2nd for now, but after deleting it will became the 1st later
            saveOptionsWithDelete.WorksheetNumber = 2;

            //... and we also save the original 2nd worksheet, which will be next sibling to the newly inserted
            saveOptionsWithDelete.InsertAsNewWorksheet = true;

            // delete the 1st and last worksheet
            saveOptionsWithDelete.WorksheetNumbersToDelete = new int[2]
            {
                1,//1st worksheet
                4//last worksheet is 4, not 3, because we inserted the edited 2nd worksheet as the new worksheet instance, without rewriting the original 2nd worksheet
            };
            // Save it again to distinct file. Output XLSX should have 2 worksheets now.
            editor.Save(worksheet2AfterEdit, "Output2Worksheets-with-delete.xlsx", saveOptionsWithDelete);
        }
    }
}

Imports GroupDocs.Editor
Imports GroupDocs.Editor.Formats
Imports GroupDocs.Editor.Options
' ...

' Load input spreadsheet to the Editor and specify loading options
Using editor As New Editor("Input3Worksheets.xlsx", New SpreadsheetLoadOptions())
    ' Prepare edit options and set 2nd worksheet to edit
    Dim editOptions As New SpreadsheetEditOptions()
    editOptions.WorksheetIndex = 1 '2nd worksheet to edit, here WorksheetIndex is 0-based due to historical reasons

    ' generate EditableDocument with original content of 2nd worksheet
    Using worksheet2OpenedForEdit As EditableDocument = editor.Edit(editOptions)
        ' Get the HTML-markup from the EditableDocument with original content
        Dim originalHtmlContentOf2ndWorksheet As String = worksheet2OpenedForEdit.GetEmbeddedHtml()

        ' emulate HTML content editing in WYSIWYG-editor in browser or somewhere else
        Dim editedHtmlContentOf2ndWorksheet As String = originalHtmlContentOf2ndWorksheet.Replace("2nd row", "Edited 2nd row at 1st column")

        ' generate EditableDocument with edited content of 2nd worksheet
        Using worksheet2AfterEdit As EditableDocument = EditableDocument.FromMarkup(editedHtmlContentOf2ndWorksheet)
            ' prepare save options without deletions
            Dim saveOptionsWithoutDelete As New SpreadsheetSaveOptions(SpreadsheetFormats.Xlsx)

            ' let it be the 2nd worksheet...
            saveOptionsWithoutDelete.WorksheetNumber = 2 'here WorksheetNumber is 1-based
            '... and we also save the original 2nd worksheet, which is pushed to the 3rd position
            saveOptionsWithoutDelete.InsertAsNewWorksheet = True

            ' So now the spreadsheet must have 4 worksheets, not 3. Save it to file
            editor.Save(worksheet2AfterEdit, "Output4Worksheets-without-delete.xlsx", saveOptionsWithoutDelete)

            ' Create another save options, with deletions at this time
            Dim saveOptionsWithDelete As New SpreadsheetSaveOptions(SpreadsheetFormats.Xlsx)
            ' let the new worksheet will be 2nd for now, but after deleting it will became the 1st later
            saveOptionsWithDelete.WorksheetNumber = 2
            '... and we also save the original 2nd worksheet, which will be next sibling to the newly inserted
            saveOptionsWithDelete.InsertAsNewWorksheet = True

            ' delete the 1st and last worksheet
            saveOptionsWithDelete.WorksheetNumbersToDelete = New Int32(1) {
                1, '1st worksheet
                4 'last worksheet is 4, not 3, because we inserted the edited 2nd worksheet as the new worksheet instance, without rewriting the original 2nd worksheet
            }
            ' Save it again to distinct file. Output XLSX should have 2 worksheets now.
            editor.Save(worksheet2AfterEdit, "Output2Worksheets-with-delete.xlsx", saveOptionsWithDelete)
        End Using
    End Using
End Using