using System;

using System.Globalization;

public class Program

{

    public void Main()

    {

        var pqReq=@"CSTrlsEN\t001\t\\sgprt\Projects2\t001\tCSTrl";

        var idx=pqReq.IndexOf(@"\t");

        Console.WriteLine(idx);

        var sDocType = pqReq.Substring(0, idx);

        Console.WriteLine(sDocType);

    }

}