How to Read Excel Files in C# Without Opening Them First?

Read Excel files using C# without opening them in advance

When reading an Excel (xlsx) file using OleDbDataAdapter and a connection string (using Microsoft.Jet.OLEDB.4.0 and Extended Properties set to Excel 8.0), an "External table format is incorrect" error may occur. This issue usually stems from using an outdated connection string configuration to access Excel 2007 files.

Solution:

In order to resolve this issue and be able to read the Excel file without opening the Excel file beforehand, it is recommended to use the following updated connection string:

<code class="language-c#">public static string path = @"C:\src\RedirectApplication\RedirectApplication1s.xlsx";
public static string connStr = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + path + ";Extended Properties=Excel 12.0;";</code>

With these changes, you can establish a correct connection to Excel files and retrieve data without having to open the file in Excel beforehand. This method ensures that your C# program can obtain data smoothly and efficiently.

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