How to escape comma in csv file without using double quotes/" in C#

Question

I am able to escape comma between strings with using double quotes such as strings are:"Laxchaman","Bharath","satrudhan" was brother of Ram.It is working fine in csv file But when i am copy the string from the csv cell to notepad it is showing """Laxchaman"",""Bharath"",""satrudhan"" was brother of Ram". That's why the csv file is not being upload in SQL. I want String must be write in csv file with comma as same as sentences in real form.

using (DataTable dt = new DataTable())
{
dt.Load(reader);
Console.WriteLine(dt.Rows.Count); //check its filled
StringBuilder sb = new StringBuilder();
string sbb = "";
sb.AppendLine(string.Join(",", dt.Columns.Cast<datacolumn>().Select(c => c.ColumnName)));
sb.Remove(sb.Length - 1, 1);
foreach (DataRow row in dt.Rows)
{
for (int i = 0; i < dt.Columns.Count; i++)
{
if (row[i].ToString().Contains(","))
{
sb.Append(String.Format("\"{0}\",", row[i]));
}
else
{
sb.Append(row[i].ToString() + ",");
}
}
sb.AppendLine();
}
ArrayList ar = new ArrayList();
File.WriteAllText(@"D:\ISR\1" + ".csv", sb.ToString());
}