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Type mismatch in expression. in access database

Shambhoo kumar asked:

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cmdselect.CommandText = "SELECT PD.Prod_ID, PD.Prod_BrandName, PD.Prod_ModelNo, SUM(iif(Isnull(PM.Prod_Qty), 0, PM.Prod_Qty)) AS Purchase_Item, SUM(iif(Isnull(SM.Prod_Qty), 0, SM.Prod_Qty)) AS Sale_Item, SUM(iif(Isnull(PM.Prod_Qty), 0, PM.Prod_Qty)) - SUM(iif(Isnull(SM.Prod_Qty), 0, SM.Prod_Qty)) AS Balance_Item FROM ((tbl_ProductDetails PD LEFT OUTER JOIN tbl_PurchaseMaster PM ON PD.Prod_ID = PM.Prod_ID) LEFT OUTER JOIN tbl_SaleMaster SM ON PD.Prod_ID = SM.Prod_ID) GROUP BY PD.Prod_ID, PD.Prod_ModelNo, PD.Prod_BrandName";

i m using this query to retrive data from access database but i m getting a error message
"Type mismatch in expression".

and i know that how it's give error because my column PD.Prod_ID is AutoNumber datatype.
 
and 
PM.Prod_ID is Number datatype
 
SM.Prod_ID is also Number Datatype.

but i dont know how i solve this problem...

so any one help me....
Tags: C#, .NET (.NET4)

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