.Net Beginners , C# Tips : Locate specific lines within the Text file Using LINQ

You can also query the text file using LINQ .
Here are example for this.
In this example we can get specific lines which has matching word given by us.
After the LINQ query is executed you need to close file otherwise it gives error on next attempt to access of file.

C# Example :

string[] lineNumbers = (from line in
                        System.IO.File.ReadLines(MapPath(
                        where line.Contains("sample")
                        select line).ToArray();

System.IO.File.OpenText(MapPath("TextFile.txt")).Close();

VB.net Example :

Dim lineNumbers As String() = (From line In
                              System.IO.File.ReadLines(MapPath("TextFile.txt"))
                              Where line.Contains("sample")
                              Select line).ToArray()

System.IO.File.OpenText(MapPath("TextFile.txt")).Close()