C# - StringSplitter

public List<string> StringSplitter(string inputString, string seperator)
{
    List<string> output = new List<string>();

    int offset = 0, i;

    while ((i = inputString.IndexOf(seperator,offset)) != -1)
    {
        output.Add(inputString.Substring(offset, i - offset));
        offset = i + seperator.Length;
     
        i = inputString.IndexOf(seperator, offset);
    }
    
    output.Add(inputString.Substring(offset, inputString.Length - offset));

    return output;
}