Hello I need you help about database and windows form app

using (SqlConnection con = new SqlConnection(strConnect))
                {
                con.Open();
                using (SqlDataAdapter da = new SqlDataAdapter("SELECT MyColumn1, MyColumn2 FROM myTable WHERE mySearchColumn = @SEARCH", con))
                    {
                    da.SelectCommand.Parameters.AddWithValue("@SEARCH", myTextBox.Text);
                    DataTable dt = new DataTable();
                    da.Fill(dt);
                    myDataGridView.DataSource = dt;
                    }
                }