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I was able to add the office reference but not the interop assembly, though I did check the excel box in assemblies.<br />
<a href="https://filedb.experts-exchange.com/incoming/2018/12_w52/1408424/MissingInterop.png" target="_blank" class="file-inline" title="MissingInterop.png (33 KB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>MissingInterop.png</a>
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I was able to add the office reference but not the interop assembly, though I did check the excel box in assemblies.
MissingInterop.png [https://filedb.experts-exchange.com/incoming/2018/12_w52/1408424/MissingInterop.png]

MissingInterop.png

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It is Interop. C# is case sensitive.
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Stewart Menzies

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I'm getting an error on this line in a new console c# project:<br />
<br />
using Excel = Microsoft.Office.Interop.E<wbr />xcel;<br />
<br />
Severity &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Code &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Description &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Project &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;File &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Line &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Suppression State<br />
Error &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;CS0234 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The type or namespace name 'Office' does not exist in the namespace 'Microsoft' (are you missing an assembly reference?) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;excel1 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;E:\dotnet\excel1\excel1\Pr<wbr />ogram.cs &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Active<br />
<br />
What do I need to be able to access excel spreadsheets from my console c# project.<br />
<br />
Thanks in advance for any help.
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I'm getting an error on this line in a new console c# project:

using Excel = Microsoft.Office.Interop.Excel;

Severity	Code	Description	Project	File	Line	Suppression State
Error	CS0234	The type or namespace name 'Office' does not exist in the namespace 'Microsoft' (are you missing an assembly reference?)	excel1	E:\dotnet\excel1\excel1\Program.cs	2	Active

What do I need to be able to access excel spreadsheets from my console c# project.

Thanks in advance for any help.

Dotnet Error: using Excel = Microsoft.Office.Interop.Excel;

C# is an object-oriented programming language created in conjunction with Microsoft’s .NET framework. Compilation is usually done into the Microsoft Intermediate Language (MSIL), which is then JIT-compiled to native code (and cached) during execution in the Common Language Runtime (CLR).

A spreadsheet is an interactive computer application program for organization, analysis and storage of data in tabular form. Spreadsheets developed as computerized simulations of paper accounting worksheets. The program operates on data represented as cells of an array, organized in rows and columns. Each cell of the array may contain either numeric or text data, or the results of formulas that automatically calculate and display a value based on the contents of other cells.

Spreadsheets

An assembly language (or assembler language) is a low-level programming language for a computer or other programmable device in which there is a very strong (generally one-to-one) correspondence between the language and the architecture's machine code instructions. Each assembly language is specific to a particular computer architecture, in contrast to most high-level programming languages, which are generally portable across multiple architectures, but require interpreting or compiling. Assembly language is converted into executable machine code by a utility program referred to as an assembler; the conversion process is referred to as assembly, or assembling the code.