hi frds,
i have create a .txt file and write some data.
i want to open on screen that .txt file for reading by a click a button.
if you have the answer, so please help me.
thanks in advance
....

You can create your viewer to text files by using control like RichTextBox and use .LoadFile method which takes text file path
Or
Using default text file editor on client machine by call Process.Start(filePath);

thank you sir, for giving idea. I use richtext box method but when i load the .txt file it hold all data but not show.
will you help me again by providing code.
thanks a lot

No, no code. You havent demonstrated what you've tried, why should someone else do it for you?

You show us your code, you tell us where your debugging says it goes wrong, and we'll help you try and work out why

System.Diagnostics.Process.Start(@"c:\textfile.txt");
or any other file by just passing the file path along with its extension but not work if the required package is not installed that is needed to open it.