Решение:
string t = "abCdefijk"; int ind = t.IndexOf("cd", StringComparison.InvariantCultureIgnoreCase); if ind is -1 then string(in this case t) does not contain given string(in this case "cd")
Решение:
string t = "abCdefijk"; int ind = t.IndexOf("cd", StringComparison.InvariantCultureIgnoreCase); if ind is -1 then string(in this case t) does not contain given string(in this case "cd")