How i can retrieve data from .txt file

Text files are not good at extracting a little bit here and there - they are really monolithic files inteneded to be read from beginning to end - they have no concept of "random access", or even of "lines" unless you code implements it.
 
So extracting a little bit of the text only is going to be a pain! There are two basic ways:
1) Read the whole file as lines, and process them individually
2) Read the whole file (or as chunks) and use a regex to identify and extract the areas you are interested in.
 
There are many other ways if the file content contains some organisation, such as XML or similar.
 
Which you want depends on what your file content looks like, and what kind of bits you want to extract.
 
Sorry to be horribly vague, but there really isn't a "one size fits all" solution to this.

Hi,
 
Here I am giving some code snipet using stream reader to retrive some information from a .txt file and binding it to a grid view, after assigning those information to a datatable.
 

<pre lang="c#"> using (FileStream s = new FileStream("C:/TextFileToGridView.txt", FileMode.Open))
        using (StreamReader r = new StreamReader(s))
        {
            List<Object> ds = new List();
 
            while (!r.EndOfStream)
            {
                String l = r.ReadLine();
                if (l[0] != '%')
                {
                    String p = l.Replace("   ", ";");
                    String[] a = p.Split(';');
                    if (a[0] != "")
                    {
                        ds.Add(new { c0 = a[0], c1 = a[1], c2 = a[2], c3 = a[3] });
                    }
                }
            }
            GridView1.DataSource = ds;
            GridView1.DataBind();
        }

 
If you want any clarification please revert.
 
Thanks
tapan kumar