Grid Lines comes on top of sine waves

Question

Hello Everyone .... i have a little bit of problems and any help will be highly appreciated .... Friends in my project (in c#) i have to receive the wavedata which is byte array from network by using socket programming in C# and plot all the values to form ..... through networking data will reach to my application at each 200 milliseconds as a buffer..... my problem is i have to plot data and at the same time need to erase the old data as well ........ i have to draw the grid too behind the waves and it should be fixed ...(should not get erased along with old data) Friends i am using paint event to draw the grid but the problem is the grid remains on the top of waves ..... using any other methods erases it which is annoying... kindly help...

Answer 1

if you're using same event to paint grid and waves, just switch order how you're painting - paint grid first and then waves.

Answer 2

Banaitis i got your point
but ..... paint event is just been used for draw grid only .....i am having  asynchronous socket thread 
with  onreceive() function
whenever data comes through network onreceive() callback functions wil get activate and this will internally make call to
drawdata(byte[] databuffer)  function
to plot data...

now if  i draw my grid in drawdata first and then plot waves then this flickers as drawdata is getting a call at each 200 Millisecond...
and
also erasing the old values will erase that portion of grid too...

so i have to go for paint but the paint is keeping it on top.....

Answer 3

Great article about double buffering:
http://www.codeproject.com/KB/graphics/DoubleBuffering.aspx?display=PrintAll&fid=262139&df=90&mpp=25&noise=3&sort=Position&view=Quick&select=2324011

Answer 4

thanks for link dear i will check it out