update stringini şu şekilde yap
Degisken=Request.Form("degisken")
Set Guncelle=Server.CreateObject("ADODB.Recordset")
sql="SELECT * FROM tablom"
Guncelle.Open sql,Baglanti,1,3
Guncelle.Update
Guncelle("hucre")=Degisken
Guncelle.Update
Guncelle.Close : Set Guncelle=Nothing
Response.redirect "default.asp"