How to retrieve the selected item data from database to Gridview using C#.

Question

hi,
How to retrieve the selected item data from database to Gridview using C#.
paste my code below,help me
 
private void dataGridView1_DoubleClick(object sender, EventArgs e)
{
cn = new SqlConnection("data source=server2;database=costing1;user id=sa;password=sa");
da2 = new SqlDataAdapter("select *from CATABLE001 where column002='@column002'", cn);
ds = new DataSet();
da2.MissingSchemaAction = MissingSchemaAction.AddWithKey;
da2.Fill(ds, "CATABLE001");
cmd = new SqlCommand();
cmd.Connection = cn;
cmd.CommandType = CommandType.StoredProcedure;
int sno = int.Parse(Interaction.InputBox("Enter ItemCode", "db operations", "", 50, 50));
DataRow dr = ds.Tables["CATABLE001"].Rows.Find(sno);
dataGridView1.DataSource = ds.Tables["CATABLE001"];