What am I doing wrong here?

I am trying to loop the lines and then loop the fields in each line. I am doing this because each line can have a different number of fields. Below is the code I am using but it is not looping the fields separately, it is just the array from the 1st loop.

            StreamReader readFile = new StreamReader(Filename);
            readFile.ReadLine();
            while ((line = readFile.ReadLine()) != null)
            {
                for (int i = 0; i < line.Length; i++)
                {
                    string[] field = new string[] { line.ToString() };

                    for (int x = 0; x < field.Length; x++)
                    {
                        string myfield;
                        myfield = field[x].ToString();
                        // do some processing here
                    }
                }
            }
            readFile.Close();