use the IndexOf() and LastIndexOf() methods to search for substrings and characters;
using System;
class MainClass {
public static void Main() {
string[] myStrings = {"To", "be", "or", "not","to", "be"};
string myString = String.Join(".", myStrings);
int index = myString.IndexOf("be");
Console.WriteLine("\"be\" first occurs at index " + index + " of myString");
index = myString.LastIndexOf("be");
Console.WriteLine("\"be\" last occurs at index " + index + " of myString");
index = myString.IndexOf('b');
Console.WriteLine("'b' first occurs at index " + index + " of myString");
index = myString.LastIndexOf('b');
Console.WriteLine("'b' last occurs at index " + index + " of myString");
}
}
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