How can Extract data from database to computer?

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C#

1-I have a database that stores various kinds of data
I want to work for the Extract of data from the database to the computer

i'm using database : sql server 2008 ,Microsoft Visual C# 2010 Express

I used this code did not work :(
2- How can the work of compression to the database sql server ??

private void Button2_Click(object sender, EventArgs e)
            {

                try
                {

                    SaveFileDialog s = new SaveFileDialog();

                    s.FileName = "";

                    if (DataGridView1.Rows.Count == 0)
                    {
                        return;
                    }

                    DataGridView1.Focus();


                    s.FileName = DataGridView1[2, DataGridView1.CurrentRow.Index].Value.ToString();


                    s.Filter = "Files(*." + DataGridView1[4, DataGridView1.CurrentRow.Index].Value.ToString() + ")|*." + DataGridView1[4, DataGridView1.CurrentRow.Index].Value.ToString() + "";



                    if (s.ShowDialog() == System.Windows.Forms.DialogResult.OK)
                    {


                        MemoryStream sWriter = new MemoryStream((byte[])(DataTable1.Rows[DataGridView1.CurrentRow.Index]["Files"]), true);
                                      if (sWriter == null)
					{
					  Interaction.Beep();
					}
					return;
					
          
                   }

                   DataGridView1.ClearSelection();

                }
                catch (Exception ex)
                {

                    Button1.Enabled = true;
                    Button2.Enabled = true;
                    Button3.Enabled = true;
                    Button4.Enabled = true;

                    MessageBox.Show(ex.Message);
                }
					
            }

here full work in this link:
http://www.mediafire.com/?c629cqc43plxgi1[^]