using System;

using System.Linq;

using System.IO;                    

public class Program

{

    public static void Main()

    {

        var test = "7-26-2021_1-54_PM_Capgemini_Error";

        string companyName = string.Empty;

        var splittedArray = test.Split('_').ToList();  //Split by "_"

        if (splittedArray.Count >= 2)

          companyName = splittedArray[splittedArray.Count - 2]; //Get second last item

        Console.WriteLine(companyName); //Print

    }

}