using System;

using System.Collections.Generic;

using System.Text;

public class Program

{

    public static void Main()

    {

        string[] columns = { "col1", "col2", "col3" };

        List<object[]> data = new List<object[]>();

        data.Add(new object[] {"row1", 1, 5 } );

        data.Add(new object[] {"row2", 2, 5 } );

​

        data.Add(new object[] {"row3", 3, 5 } );

​

        data.Add(new object[] {"row4", 4, 5 } );

​

        Console.WriteLine(GetCsv(columns, data));

    }

public static string GetCsv(string[] columns, List<object[]> data)

{

    StringBuilder CsvData = new StringBuilder();

​

    //add column headers

    string[] s = new string[columns.Length];

    for (Int32 j = 0; j < columns.Length; j++)

    {

        s[j] = columns[j];

        if (s[j].Contains("\"")) //replace " with ""

            s[j].Replace("\"", "\"\"");

        if (s[j].Contains("\"") || s[j].Contains(" ")) //add "'s around any string with space or "

            s[j] = "\"" + s[j] + "\"";

    }

    CsvData.AppendLine(string.Join(",", s));

​

    //add rows

    foreach (var row in data)

    {

        for (int j = 0; j < columns.Length; j++)

        {

            s[j] = row[j] == null ? "" : row[j].ToString();

            if (s[j].Contains("\"")) //replace " with ""

                s[j].Replace("\"", "\"\"");

            if (s[j].Contains("\"") || s[j].Contains(" ")) //add "'s around any string with space or "

                s[j] = "\"" + s[j] + "\"";

        }

        CsvData.AppendLine(string.Join(",", s));

    }

​

    return CsvData.ToString();

​

}

}