<div>
Hi <br />
Pls try..<br />
<br />
You are using OPENXML then file format should be xlsx. <br />
<br />
Hope it helps!
</div>


Hi
Pls try..

You are using OPENXML then file format should be xlsx.

Hope it helps!

<div>
I mean the way to locate the reason, within C# codes.
</div>


I mean the way to locate the reason, within C# codes.

<div>
Hi,<br />
Pls post the code from this function - <br />
<br />
ReadFile(String par_File)<br />
<br />
Hope it helps!
</div>


Hi,
Pls post the code from this function -

ReadFile(String par_File)

Hope it helps!

<div>
<div class="content wysiwyg-content">
Hi,<br />
To this Stacktrace<br />

<pre><code id="code-10-28991039-1">Exception: The specified package is invalid. The main part is missing.    at DocumentFormat.OpenXml.Packaging.OpenXmlPackage.Load()
   at DocumentFormat.OpenXml.Packaging.OpenXmlPackage.OpenCore(String path, Boolean readWriteMode)
   at DocumentFormat.OpenXml.Packaging.SpreadsheetDocument.Open(String path, Boolean isEditable, OpenSettings openSettings)
   at DocumentFormat.OpenXml.Packaging.SpreadsheetDocument.Open(String path, Boolean isEditable)
   at App12.Program.ReadFile(String par_File)</code></pre>
which line should be with the error? How to further find out reason to such error?
</div>
</div>


Hi,
To this Stacktrace
(CODE)
which line should be with the error? How to further find out reason to such error?

Problem to error

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).

The .NET Framework is not specific to any one programming language; rather, it includes a library of functions that allows developers to rapidly build applications. Several supported languages include C#, VB.NET, C++ or ASP.NET.

.NET Programming

A programming language is a formal constructed language designed to communicate instructions to a machine, particularly a computer. Thousands of different programming languages have been created, mainly in the computer field, and many more still are being created every year. The description of a programming language is usually split into the two components of syntax (form) and semantics (meaning). Some languages are defined by a specification document (for example, the C programming language is specified by an ISO Standard), while other languages (such as Perl) have a dominant implementation that is treated as a reference. Some languages have both, with the basic language defined by a standard and extensions taken from the dominant implementation being common.

Programming Languages-Other

OpenXML

This topic area includes legacy versions of Windows prior to Windows 2000: Windows 3/3.1, Windows 95 and Windows 98, plus any other Windows-related versions including Windows Mobile.