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public string Vector3ToString(Vector3 vector)
{
    /* An output string might look like */
    /* 150,250,0 */
    return (string.Format("{0},{1},{2}", vector.x, vector.y, vector.z));
}

public Vector3 StringToVector3(string vector)
{
    /* Split the string into a series of string, seperated by the comma */
    string[] components = vector.Split(',');

    /* Parse the strings into ints and insert those as the Vectors X/Y and Z */
    return new Vector3(int.Parse(component[0]), int.Parse(component[1]), int.Parse(component[2]));
}