Question

this code works fine but my problem is that i need to read the files that contains ESSD and if this file contains a name in certain line, add it to my listbox1, and if it doesnt contain the name in that line, dont add it to the listbox1.

Thanks.

private void button1_Click(object sender, EventArgs e)
    {
        DialogResult result = this.openFileDialog1.ShowDialog();
        if (result == DialogResult.OK)
        {
            string[] Nomarchivo = this.openFileDialog1.FileNames;
            string NomDirec = Path.GetDirectoryName(Nomarchivo[0]);
            for (int a = 0; a <= Nomarchivo.Length - 1; a++)
            {
                string NomDirGral = Nomarchivo[a].Remove(Nomarchivo[a].Length - 7, 7);
                string NomGral = NomDirGral.Replace(NomDirec, " ");
                NomGral = NomGral.Remove(0, 2);
                foreach (string f in Directory.GetFiles(NomDirec, NomGral + "*"))
                    this.listBox1.Items.Add(f);
                foreach (string h in Directory.GetFiles(NomDirec, "resume*"))
                    this.listBox1.Items.Add(h);
                foreach (string t in Directory.GetFiles(NomDirec, "ESSD1*"))
                    this.listBox1.Items.Add(t);
            }
            string[] list1 = new string[listBox1.Items.Count];
            for (int b = 0; b <= listBox1.Items.Count - 1; b++)
            {
                list1[b] = listBox1.Items[b].ToString();
            }
            string[] list2 = list1.Distinct().ToArray();
            foreach (string g in list2)
                this.listBox2.Items.Add(g);

            Class1 arr1 = new Class1();
            arr1.array(listBox2);
        }
        else { Close(); }
    }

Answer 1

.NET 4 offers a nice function called File.ReadLines(fileName)

With this function, your above code can be modified as:

private void button1_Click(object sender, EventArgs e) 
{ 
    DialogResult result = this.openFileDialog1.ShowDialog(); 
    if (result == DialogResult.OK) 
    { 
        string[] Nomarchivo = this.openFileDialog1.FileNames; 
        string NomDirec = Path.GetDirectoryName(Nomarchivo[0]); 
        for (int a = 0; a <= Nomarchivo.Length - 1; a++) 
        { 

            //the name we are looking for.
            List<string> namesWeAreLookingFor = new List<string>();

            string NomDirGral = Nomarchivo[a].Remove(Nomarchivo[a].Length - 7, 7); 
            string NomGral = NomDirGral.Replace(NomDirec, " "); 
            NomGral = NomGral.Remove(0, 2); 
            foreach (string f in Directory.GetFiles(NomDirec, NomGral + "*")) 
                this.listBox1.Items.Add(f); 
            foreach (string h in Directory.GetFiles(NomDirec, "resume*")) 
            {
                this.listBox1.Items.Add(h); 

                var nameLines = File.ReadLines(NomDirec + @"\" + h);
                foreach (var item in nameLines)
                {
                    //do whatever you need to get a name in this file here
                    //...

                    //Assuming there is one name per line, add the name to the list
                    namesWeAreLookingFor.Add(item);
                }
            }
            foreach (string t in Directory.GetFiles(NomDirec, "ESSD1*")) 
            {
                this.listBox1.Items.Add(t); 
                //try to access the file so we can read line 6 using new .NET 4 method 
                var lines = File.ReadLines(NomDirec + @"\" + t);

                //see if we even have 6 lines
                if (lines.Count() < 6)
                    continue;

                String line6 = lines.ElementAt(5);

                //loop through the names we pulled
                foreach (var item in namesWeAreLookingFor)
                {
                    //see if line 6  containes that name.
                    if (line6.Contains(item))
                    {
                        //if it exists, then add it to the list and exit the loop.
                        this.listBox1.Items.Add(t);
                        break;
                    }
                }
            }
        } 
        string[] list1 = new string[listBox1.Items.Count]; 
        for (int b = 0; b <= listBox1.Items.Count - 1; b++) 
        { 
            list1[b] = listBox1.Items[b].ToString(); 
        } 
        string[] list2 = list1.Distinct().ToArray(); 
        foreach (string g in list2) 
            this.listBox2.Items.Add(g); 

        Class1 arr1 = new Class1(); 
        arr1.array(listBox2); 
    } 
    else { Close(); }