accessing controls from one page and populating data in another page controls automatically

Hello ...I am Vikas Shukla i've one form "admission form" where i filled all the personal details of following students such as stud_id(using dropdownlist),name,address,contact,emailid etc in textbox controls and also have another form "General Register Form(G.R. Form)" .. in tht form too  i've some of the same fields(textbox controls) which is in "admission form" like stud_id(dropdownlist),name,address,contact,emailid etc ... but i want tht...........on the selection of  stud_id using  dropdownlist the following detail  such as name,address,contact,emailid etc  should come on  GR Form automatically  i.e. tht following controls  should be filled automatically when i come to GR ...