C# save txt file on desktop

Question

How can I save a txt file that it was created by me on desktop?

This is the code:

void CreaTxtBtnClick(object sender, EventArgs e){
    string filePath = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);
    filePath = filePath + @"\Error Log\";
    TextWriter sw = new StreamWriter(@"Gara.txt");

    int rowcount = dataGridView1.Rows.Count;
    for(int i = 0; i < rowcount - 1; i++){
        sw.WriteLine(
            dataGridView1.Rows[i].Cells[0].Value.ToString() + '\t' +
            dataGridView1.Rows[i].Cells[1].Value.ToString() + '\t' +
            dataGridView1.Rows[i].Cells[2].Value.ToString() + '\t' +
            dataGridView1.Rows[i].Cells[3].Value.ToString() + '\t' +
            dataGridView1.Rows[i].Cells[4].Value.ToString() + '\t' +
            dataGridView1.Rows[i].Cells[5].Value.ToString() + '\t' +
            dataGridView1.Rows[i].Cells[6].Value.ToString() + '\t' +
            dataGridView1.Rows[i].Cells[7].Value.ToString() + '\t'
        );
    }
    sw.Close();
    MessageBox.Show("File txt creato correttamente");
}

I thought that with these instructions

Environment.GetFolderPath(Environment.SpecialFolder.Desktop);
filePath = filePath + @"\Error Log\";
TextWriter sw = new StreamWriter(@"Gara.txt");

I can save the file on Desktop, but the txt is created correctly in the wrong path. How can I fix it?

Solution 1

You've constructed your filePath, but haven't used it in TextWriter. Instead you're just writing to Gara.txt file which is by default located in the folder where your application started in.

Change your code to something like:

 filePath = filePath +@"\Error Log\Gara.txt";
 TextWriter sw= new StreamWriter(filePath);

Solution 2

You have to combine all path parts into the final filePath:

string filePath = Path.Combine(
   Environment.GetFolderPath(Environment.SpecialFolder.Desktop), 
  "Error Log",
  "Gara.txt");

I suggest using Linq to save the data which is more readable and easier to maintain:

File
  .WriteAllLines(filePath, dataGridView1
    .Rows
    .OfType<DataGridViewRow>()
    .Select(row => string.Join("\t", row
       .Cells
       .OfType<DataGridViewCell>()
       .Take(8) // if grid has more than 8 columns (and you want to take 8 first only)
       .Select(cell => cell.Value)) + "\t")); // + "\t": if you want trailing '\t'