C# Split function. Problems splitting string delimited files...

I am having problems with the .split function.
                     token_list = line.Split(',');
My input data is a CSV file that contains numbers and strings totaling 5 columns. The strings are string delimited...
1, 2, "Test", 1, "Test"                                      5 columns
1, 2, "Test", 1, "Test"                                      5 columns
1, 2, "Test, Test", 1, "Test"                ...