Reading from an writing to a text file by omitting specific lines in the read file.

Try this
public void readWriteFile()
{
int txtLines = File.ReadAllLines(@"test.txt").Length;
string[] str = new string[txtLines ];
using (StreamReader sr = new StreamReader("test.txt"))
{

for (int i = 0; i < txtLines; i++)
{

str[i] = sr.ReadLine();

}
using (StreamWriter sw = new StreamWriter("test2.txt"))
{
for (int i = 9; i < txtLines; i++)
{

sw.WriteLine(str[i]);

}
}
}

}

edit here for vb


Sub readWriteLine()
Dim txtLines As Integer = File.ReadAllLines("test.txt").Length
Dim str(txtLines) As String
Dim i As Integer = 0
Using sr As New StreamReader("test.txt")
Do Until i = txtLines

str(i) = sr.ReadLine()
i += 1
Loop

End Using
i = 9
Using sw As New StreamWriter("test2.txt")
Do Until i = txtLines

sw.WriteLine(str(i))
i += 1
Loop

End Using

End Sub