trim string in c# after specific character

string str = "asd.uk";
            if (str.Contains('.'))
            {
                int index = str.IndexOf('.');
                string result = str.Substring(0, index);
                Console.WriteLine("result: " + result);
            }

string[] FinalArr = { }; // An array
        if (RawAddedItems.Length > 1) //<rawaddeditems is my data
        {
            if (RawAddedItems.Contains("OrderPageRadios"))//To confirm the data which needs to be parsed
            {
                int index = RawAddedItems.IndexOf("OrderPageRadios"),
                    secondindex = RawAddedItems.IndexOf("[", index) + 1,
                    LastIndex = RawAddedItems.IndexOf("]", index);

                string NewDBString = RawAddedItems.Substring(secondindex, LastIndex - secondindex);

                FinalArr = NewDBString.Split("|");
                return FinalArr;
            }

            return FinalArr;
        }
        else
            return FinalArr;
    }

using System;

class Program
{
    static void Main()
    {
    const string s = "Dot Net Perls is about Dot Net.";
    Console.WriteLine(s);

    // We must assign the result to a variable.
    // ... Every instance is replaced.
    string v = s.Replace("Net", "Basket");
    Console.WriteLine(v);
    }
}