[DotNetDevelopment] error in my update stmt in c#.net

[A M Swaminathan]

hello  everybody,

i am swami. i had developed a c#.net windows application with access
database..
in update operation i got error..  pls help me..

The code is:

OleDbConnection con = new OleDbConnection
("Provider=Microsoft.Jet.Oledb.4.0;Data Source=C:\\cictapp.mdb"
OleDbDataAdapter od;
DataSet ds;
string str = "update samp set name= '" + textBox2.Text + "', " +
"place= '" + textBox3.Text + "'+" + "where id='" + textBox1.Text +
"'";
                od = new OleDbDataAdapter(str, con);
                ds = new DataSet();
                od.Fill(ds, "samp");
                label4.Text = "Record Updated";

thanks in advance..

regards
swaminathan.