Syntax error in UPDATE statement

GridViewRow row = (GridViewRow)ResultGridView.Rows[e.RowIndex];
        Label lbl = (Label)row.FindControl("lblid");
        TetBox txextname = (TextBox)row.FindControl("textbox1");
        TextBox textmarks = (TextBox)row.FindControl("textbox2");
        ResultGridView.EditIndex = -1;
                conn.Open();

               OleDbCommand cmd = new OleDbCommand("update db1 set Names='" + textname.Text + "' , Number='" + textmarks.Text + "' where Id='" + lbl.Text + "'",conn);
                //.CommandText = "Update StudentRecord set Name='" + txtname.Text + "',ClassName='" + txtclassname.Text + "',RollNo='" + txtrollno.Text + "',EmailId='" + txtemailid.Text + "' where StId='" + lblstid.Text + "'";

                cmd.CommandType = CommandType.Text;
               OleDbDataAdapter da = new OleDbDataAdapter(cmd);
                cmd.CommandType = CommandType.Text;

        cmd.ExecuteNonQuery();

       
        conn.Close();
        bind();