may be u r placing the script manager after the tab control.. make sure.. it is placed on top.. place it on top of the page.. that ways u`ll avoid this error... do this for every ajax control.. Kunal

wrote: do i use the regularexpression validator(if so how?) You can do. Off the top of my head the regular expression would be something like ^[0-9]*$ NOTE: This accepts only positive integers only. Upcoming events: * Edinburgh: Web Security Conference Day for Windows Developers (12th April) * Glasgow: AJAX, SQL Server, Mock Objects My: Website | Blog | Photos

No, it should be the name of the entry in your configuration file that contains the connection string to get to Pubs.

not got your query in full. can you please give the sql statement reselted in this error. along with the 1. parent able and chield table 2. primary keys on the tables however what i under stook is province is parent and client is chield if so one column like provienceID should be primary key in province table and in client table's provienceID can refer to provience table Regards KP

yes that s IDENTITY See the example : CREATE TABLE Emp (EMPID int IDENTITY (1, 1) NOT NULL ,EMPNAME VARCHAR(20)) Above this examble Identity is like an auto increment. The Parameters (1,1) represents Start Number, Increment Number this example starts 1 and next incremented by 1 RK

the field in the database becomes blank.? you mean. the selected value doesn't store in database. some tips. 1. Set the breakpost in Button Save. Check the selected value of combobox. 2. Check whether you got any value (eg: paraProvince) in Businesslayer.Contractors.AddContractor() function. [Make ensure that all values of parameters has been passed from Presentation Layer to BusinessLayer.] 3. Check the SQL Statement.. [Make ensure that all values of parameters has been passed from BusinessLayer to DataLayer.] Thanks and Regards, Michael Sync ( Blog: http://michaelsync.net) If you want to thank me for my help, please vote my message by clicking one of numbers beside "Rate this message". Thank you. :)

Check these out for size: ASP.NET Data Access Tutorials (aka a 3-tier pattern)