C# Open Excel file

I am trying to open an excel file in .NET.  I found the below code and I'm trying to use it but I'm receiving errors.  

Application excel = new Application();
Workbook wb = excel.Workbooks.Open(path);

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I'm using VS 2015.

Errors I'm receiving are:

1.  Applicaion does not contain a constructor that takes 0 arguments.
2.  Application' does not contain a definition for 'Workbooks' and no extension method 'Workbooks' accepting a first argument of type 'Application' could be found (are you missing a using directive or an assembly reference?)      

I added Interop excel as a reference. v 15.
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CipherISAsked:
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Ryan ChongCommented:
tried use :
System.Diagnostics.Process.Start(path);

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?
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CipherISAuthor Commented:
That works.  Just wondering why I can't use the code that I find in my searches.
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Rgonzo1971Commented:
Hi,

Another way to open
        Excel.Application xlApp;
        Excel.Workbook xlWorkBook1;

        xlApp = new Excel.Application();
        xlWorkBook1 = xlApp.Workbooks.Open("c:\\YourFile.xlsx", Type.Missing, false, Type.Missing,
                Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing);

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REgards
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CipherISAuthor Commented:
The problem is that even when I try
Excel.Application

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I still receive an error.  I know I've done this previously in other apps that I've developed.
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Éric MoreauSenior .Net ConsultantCommented:
which error?
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CipherISAuthor Commented:
Well, I can't event type "Excel" alone.  When I attempt to intelisense gives me "ExcelDataOnlyFormatOptions".
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Éric MoreauSenior .Net ConsultantCommented:
you are surely missing the using clauses:
using Microsoft.Office.Core;
using Microsoft.Office.Interop.Excel;

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CipherISAuthor Commented:
I'll look at that.
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CipherISAuthor Commented:
Found the issue.  Another namespace was inadvertently added which negated the Interop.excel namespace.  Thanks Eric.
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CipherISAuthor Commented:
There was code in the namespace similar to

Application = .......;

which was not pointing to excel.  This was causing the problem.

I deleted it.  I should have copied and pasted it here to have as a reference.
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