[Solved]-How to find first occurrence in c# list without going over entire list with LINQ?-LINQ,C#

bool hasJName = strings.Any(x => x.StartsWith("J"));

This checks to see if any names that start with J exist.

string jName = strings.FirstOrDefault(x => x.StartsWith("J"));

This returns the first name that starts with J. If no names starting with J are found, it returns null.

Using the First LINQ method (in System.Linq):

strings.First(e => e.StartsWith("J"));

Or FirstOrDefault if you are not sure that any element in your list will satisfy the condition:

strings.FirstOrDefault(e => e.StartsWith("J"));

Then, it returns null if no element has been found.

You can use FirstOrDefault:

var firstMatch = strings.FirstOrDefault(s => s.StartsWith("J"));
if(firstMatch != null)
{
    Console.WriteLine(firstMatch);
}

demo