how to save any file in database and retriving it showing it in imagebutton control

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ASP.NET

hi,i have i imagebutton control with a default image on it.what i want that when i click on that imagebutton i file should be uploaded in database from our computer and should be saved on the database,and also should be seen in that imagebutton.for that i have written code as
"insert into uploadfile values (@userid,@file).this is code not giving me any error but i dont know that really my file is being saved in the database, also
i have used table datatype as 'varchar' for userid and 'image' for file
but i am not able to retrive that image and show in the imagebutton.
i am writing the code as

"select images from tablename where userid=@id"
while(dr.read())
{
imgbtn=dr["images"];
}

i have also used fileupload control.
atually my idea is to make a facebook like project.also user can upload as many as file please help give me a code which i can understand easily .