C# code to convert a data reader to stringbuilder

public static StringBuilder ConvertDataReaderToStringBuilder(string sqlConnectionString, string storedprocedureName)
        {
            StringBuilder sb = new StringBuilder();
            try
            {
                using (var sqlCon = new SqlConnection(sqlConnectionString))
                {

                    using (SqlCommand cmd = new SqlCommand(storedprocedureName, sqlCon))
                    {
                        cmd.CommandType = CommandType.StoredProcedure;

                        sqlCon.Open();

                        using (SqlDataReader reader = cmd.ExecuteReader())
                        { 
                            //Get All column 
                            var columnNames = Enumerable.Range(0, reader.FieldCount)
                                                    .Select(reader.GetName)
                                                    .ToList();

                            //Create headers
                            sb.Append(string.Join(",", columnNames));

                            //Append Line
                            sb.AppendLine();

                            while (reader.Read())
                            {
                                for (int i = 0; i < reader.FieldCount; i++)
                                {
                                    string value = reader[i].ToString();
                                    if (value.Contains(","))
                                        value = "\"" + value + "\"";

                                    sb.Append(value.Replace(Environment.NewLine, " ") + ",");
                                }
                                sb.Length--; // Remove the last comma
                                sb.AppendLine();
                            }
                        }
                    }
                }

            }
            catch (Exception ex)
            {
                throw ex;
            }
            return sb;
        }