c# Dictionary> data to csv or excel

Question

I have a Dictionary<string, List<Data>> in the form of data. Here, with the help of my string keyword, I want to access the data I have stored in the List<Data> and convert it to excel or csv format.

*******************************
**            KEY            **
*******************************
** StringData ** IntegerData **
**  ''        ** ''          **
**  ''        ** ''          **
**  ''        ** ''          **

I want to create a table structure on an excel csv like the one above.

 public struct Data
        {
            public Data(String strValue, int intValue)
            {
                IntegerData = intValue;
                StringData = strValue;
            }

            public int IntegerData { get; private set; }
            public string StringData { get; private set; }
        }

 Dictionary<string, List<Data>> ds = new Dictionary<string, List<Data>>();