Count and delete in file

[vinsbg]

Hi,
So i have this program which read single text file and write in other. Basically read every line then write to another file "this number is n times here + numbers".

Can someone help me to modify this to store only 1 time the number in second file. What I mean is not like now:

Now output is:

Count of matching numbers in this group: 7
Numbers:
01070400
01070400
01070400
01070400
01070400
01070400
01070400

Is better to be:

Count of matching numbers in this group: 7
Number:
01070400
 

Code that I use is:

            string path = "text.txt";
 
            var result = (File.ReadLines(path)).OrderBy(x => x).GroupBy(x => x);
 
            using (var writer = new StreamWriter("test1.txt"))
            {
                foreach (var item in result)
                {
                    string outGrp = String.Format("Count of matching numbers in this group: {0}", item.Count());
                    Console.WriteLine(outGrp);
                    writer.WriteLine(outGrp, true);
                    Console.WriteLine("Numbers:");
                    writer.WriteLine("Numbers:", true);
                    foreach (var member in item)
                    {
                        Console.WriteLine(member);
                        writer.WriteLine(member, true);
                    }
                }
            }

[vinsbg]

Oh, is just one break; into second foreach.