but how to set the value to file upload control during postback ?

this is edit page and i want that fileupload kept last image value and if we select new image then change its value

this is edit page and i want that fileupload kept last image value and if we select new image then change its value

hi.i want to read byte of save picture and show in fileUpload control.the below code dont work.please quidance me

while (dr.Read())
{
picture_fileUpload = (byte[])dr["picture"];
}