Error underscoreLandscapeFromPageToPage is not declared and PaperSize cannot be used in vb.net

Dear Sir,

I have an error like below :

'underscore' is not declared. It may be inaccessible due to its protection level. 'Landscape' is not declared. It may be inaccessible due to its protection level. 'PaperSize' is a class type and cannot be used as an expression. 'FromPage' is not declared. It may be inaccessible due to its protection level. 'ToPage' is not declared. It may be inaccessible due to its protection level.

When I convert from C# to VB.NET but The code I used in C# has no errors.

Please Guide me

Thanks

 Code In VB..NET

Public Function GetExcelArray() As Byte()
`underscore is not declared.`
       Return Report?.Render("Excel", Nothing, underscore, underscore, underscore, underscore, underscore)
End Function
Public Function GetDefaultPrinter() As PrintDocument
	Return New PrintDocument With {
		.DefaultPageSettings = {
`Landscape is not declared.`
			Landscape = Report.GetDefaultPageSettings().IsLandscape,
`PaperSize is a class type and cannot be used as an expression.`
			PaperSize = New PaperSize(Report.GetDefaultPageSettings().PaperSize.PaperName, Report.GetDefaultPageSettings().PaperSize.Width, Report.GetDefaultPageSettings().PaperSize.Height)
		},
		.PrinterSettings = {
`FromPage is not declared.`
			FromPage = 1,
`ToPage is not declared`
			ToPage = GetImage().Frames.Count
		}
	}
End Function

 Code in C#

public byte[] GetExcelArray() => Report?.Render("Excel", null, out _, out _, out _, out _, out _);
 public PrintDocument GetDefaultPrinter() => new PrintDocument
 {
     DefaultPageSettings =
     {
         Landscape = Report.GetDefaultPageSettings().IsLandscape,
         PaperSize = new PaperSize(Report.GetDefaultPageSettings().PaperSize.PaperName,
             Report.GetDefaultPageSettings().PaperSize.Width,
             Report.GetDefaultPageSettings().PaperSize.Height)
     },

     PrinterSettings =
     {
         FromPage = 1,
         ToPage = GetImage().Frames.Count
     }
 };