how i use exceptional handling in this asp.net code

protected void Button5_Click(object sender, EventArgs e)
{
 

SqlConnection con = new SqlConnection(con_str);
SqlDataAdapter ad1;
DataSet ds = new DataSet();
ad1 = new SqlDataAdapter("select * from table1", con);
ad1.Fill(ds, "0");
GridView2.DataSource = ds.Tables["0"];
GridView2.DataBind();

}