I want to write data at a specified value in a text file from a text box. Here is a example:

item_begin etcitem 3344 item_type=etcitem is first line and item_begin weapon 3343 item_type=weapon is second. Well i want to replace item_type=weapon at second line with item_type=armor. Here is code so far:

var data2 = File.WriteAllLines("itemdata.txt")
    .Where(x => x.Contains("3343"))
    .Take(1)
    .SelectMany(x => x.Split('\t'))
    .Select(x => x.Split('='))
    .Where(x => x.Length > 1)
    .ToDictionary(x => x[0].Trim(), x => x[1]);

But returns error at WriteAllLines. Here is the readline part code:

var data = File.ReadLines("itemdata.txt")
    .Where(x => x.Contains("3343"))
    .Take(1)
    .SelectMany(x => x.Split('\t'))
    .Select(x => x.Split('='))
    .Where(x => x.Length > 1)
    .ToDictionary(x => x[0].Trim(), x => x[1]);
//call values

textitem_type.Text = data["item_type"];

And want to write the same value I change on textitem_type.Text after read.

I used this to reaplace but replaces all values with same name from line and returns me in text only 1 line. Code:

 private void button2_Click(object sender, EventArgs e)
    {
        var data = File
                    .ReadLines("itemdata.txt")
                    .Where(x => x.Contains(itemSrchtxt.Text))
                    .Take(1)
                    .SelectMany(x => x.Split('\t'))
                    .Select(x => x.Split('='))
                    .Where(x => x.Length > 1)
                    .ToDictionary(x => x[0].Trim(), x => x[1]);
        StreamReader reader = new StreamReader(Directory.GetCurrentDirectory() + @"\itemdata.txt");
        string content = reader.ReadLine();
        reader.Close();
        content = Regex.Replace(content, data["item_type"], textitem_type.Text);
          StreamWriter write = new StreamWriter(Directory.GetCurrentDirectory() + @"\itemdata.txt");
        write.WriteLine(content);
        write.Close();
    }