Why is this piece of code not working

[Learned]

I have tried to look at it about 20 times but can't find any issue. Please bear in mind that I am a bit novice for c-sharp.

The console part works fine so my StoreArray is not having any problem but there is no output to the file.

string tempfilename = "F:\\Research\\Out_1_TickData.csv";
outfileName = @tempfilename;
StreamWriter outStream = new StreamWriter(outfileName, true);

                for (int p = 0; p < Row_StoreArray; ++p)
                {
                    for (int q = 0; q < Col_StoreArray; ++q )
                    {
                        Console.Write("," + StoreArray[p, q]);
                        outStream.Write("," + StoreArray[p, q] );
                    }
                    Console.WriteLine(",");
                    outStream.WriteLine(",");
                }

Thanks in advance.