When saving to a text file how do i add in each line a text like: Line 1: then next line: Line 2: ?

I tried this way:
int countitems = 0;
private void SaveToListView()
listView1.BeginInvoke(new MethodInvoker(delegate
using (StreamWriter sw = new StreamWriter(@"c:\listviewfile\databaseEN.txt"))
foreach (ListViewItem item in listView1.Items)
countitems++;
sw.WriteLine("Line Number " + countitems + ": " + item.Text);
for (int i = 1; i < item.SubItems.Count; i++)
sw.WriteLine("Line Number " + (countitems + 1) + ": " + item.SubItems[i].Text);
What i get is:
Line Number 1: הכרויות
Line Number 2: 93
Line Number 2:
Line Number 2: הכרויות לגילאי 30+
Line Number 3: 1365
Line Number 3:
Line Number 3: אהבה ורומנטיקה
Line Number 4: 214
Line Number 4:
Line Number 4: א-מיניים
Line Number 5: 1493
Line Number 5:
Line Number 5: בינו לבינה
Line Number 6: 30
Line Number 6:
Line Number 6: זוגות מעורבים
Line Number 7: 257
Line Number 7:
Line Number 7: זוגיות במשבר
And what i want to get is the first line to be 1 the next line 2 then 3 4 5 6 7...
And the lines that are empty to remove them.
For example Line Number 6:
Should be empty and should be removed.

for (int i = 1; i < item.SubItems.Count; i++)
if(item.SubItems[i].Text != "")
countitems++;
sw.WriteLine("Line Number " + (countitems) + ": " + item.SubItems[i].Text);

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