See here http://www.codeproject.com/aspnet/[^] Farhan Noor Qureshi if (this == this) thow this;

Thanks Actually I have many tables and for each table I have made dropdown control to load data. (you can say these are lookup tables)

There is not need for hidden fields or things like that. Make sure that your control implements the IPostBackDataHandler and then in the LoadPostData method you assign the control the value from the valuecollection, e.g. this.Value = postCollection.Item(this.UniqueID). jjrdk

shahzadarfan wrote: Now one other question how to render server side control from custom control with this MyPanel class There are two common ways to render the child controls of a custom control: + Override the Render method. + Override the CreateChildControls method. shahzadarfan wrote: I want to store some value in hidden box so that it can be availble on post back. but simple html control lose it value on post back Make sure that your child controls are created before the ViewState data is loaded in the control life cycle when a postback occurs