A library built based on the C# ExcelDataReader that can be used for reading data from excel for test automation. This library loads the excel and its sheets into a static class which can be shared by multiple automation test scripts. It supports loading multiple excel files.
ExcelDataReader - https://github.com/ExcelDataReader/ExcelDataReader

Excel file format: .xlsx
To read the protected excel files pass password in optional pwd parameter

• ExcelReader.Load(string dataFilePath, optional string pwd)
  Function: Checks whether excel is loaded and if not loads the excel and its sheets.
  return: void
• ExcelReader.ReadData(string filepath, string sheetName, int rowNumber, string columnName, optional string pwd)
  Function: Returns the column value. filepath acts as the key for the required excel file as multiple files can be loaded at the same time.
  return: column value as string
• ExcelReader.GetRowCount(string filepath, string sheetName, optional string pwd)
  Function: Loads the file if already not loaded. Returns the row count.
  return: row count as int

Project includes unit tests for the library created using MSTest and Specflow.
ExcelReaderMSTests => MS Test unit tests
SpecFlowExcelReaderTests => Specflow (BDD) unit tests

Azure devops continuous integration (CI/CD) pipeline can be found under below location. The build pipeline triggers the release flow where unit tests - both MS test and Spec flow are run.:
https://dev.azure.com/remyanambala/ExcelReader/

Specflow results:

MSTest results:

How to use this in selenium scripts:
Below is a screenshot of using it in Easy Repro - MS Dynamics 365 Selenium test automation framework.