Getting specific lines of data from a string

Question

I use Mailkit and it has a function that fetch me email body text GetMessage().Textbody , i want to get specific lines of email body that contain specific strings

For example:

12313 banana milkshake
12356 choco milkshake
kiwi milkshake 1231313

and goes on....

I want to get from the 700 lines of email text body only 2 lines that contains the word "kiwi" and "choco"

   Using reader As New StreamReader("mail.txt")
                While Not reader.EndOfStream
                    Dim line As String = reader.ReadLine()
                    If line.Contains("kiwi" or "choco") Then
                        Console.WriteLine(line)
                        Exit While
                    End If
                End While
            End Using

i've been trying to find a better and faster way instead of saving string to file then using this

Answer 1

in c# since I dont know vb.net but you can translate

string msg = GetMessage().TextBody();
var lines = msg.Split('\n');
var res = lines.Where(l=>(l.Contains("kiwi") || l.Contains("choco")));

if the linq stuff doesnt translate well to vb.net then do

var res = new List<string>();
foreach(var l in lines)
{
    if (l.Contains("kiwi") || l.Contains("choco"))
    {
         res.Add(l);
    }
}