null value problem in rating conrol

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C#

ASP.NET

hi All
i have used a rating control in my project.and bind that rating control in with datalist.i had bind the datalist using a storeprocedure and linq technique i have used a table named as rating table and a view which holds the avg rating,ratedto,usertype .and i am displaying the rating as

<ajaxToolkit:Rating runat="server" ID="Rating1" MaxRating="5"
                            CssClass="ratingStar" StarCssClass="ratingItem" WaitingStarCssClass="Saved"   CurrentRating= '<%#Eval("rating") %>'
                       OnChanged ="rating_Changed" FilledStarCssClass="Filled" EmptyStarCssClass="Empty" AutoPostBack="True"
                               ReadOnly ="true"  ></ajaxToolkit:Rating>

here in the datalist i am displaying all the usertype both rated and unrated.it shows me error that rating control can convert null value to int32 type.SO how will i display the avg rating.i want to display the rating through the 5 star rating and if those are not rated showed me with empty star.
how will i handle this null value and convert to int or zero for which are not rated.
if anybody knows the solution then please solve this.


Thanks in Advance To all.