C# third index of a character in a string

Question

is there a command that can get the third index of a character in a string? For example:

error: file.ext: line 10: invalid command [test:)]

Answer 1

A little ugly, but an alternative approach (to the others already posted) that works:

public int FindThirdColonIndex(string msg)
{       
    for (int i = 0, colonCount = 0; i < msg.Length; i++)
    {
        if (msg[i] == ':' && ++colonCount == 3) { return i; }
    }

    // Not found
    return -1;
}