菜鸟,关于DetailsView更新数据的问题
BLL中
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public   static   ItemInfo   Update(string   _itemId,   string   _image,   decimal?   _listPrice,   string   _name,   string   _productId,   string   _status,   int?   _supplier,   decimal?   _unitCost)   {.......}
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更新时出现错误
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ObjectDataSource“ObjectDataSource1”未能找到带参数的非泛型方法“Update”:   _itemId,   _image,   _listPrice,   _name,   _productId,   _status,   _supplier,   _unitCost,   ProductId,   Image,   UnitCost,   Supplier,   Status,   ListPrice,   Name,   ItemId。  
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似乎是参数重复了..可是应该如何取消重复的参数啊..不会搞..

页面中代码
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<asp:DetailsView   ID= "DetailsView1 "   runat= "server "   AutoGenerateEditButton= "True "   AutoGenerateRows= "False "
                        DataSourceID= "ObjectDataSource1 "   Height= "50px "   Width= "125px "   DataKeyNames= "ItemId ">
                        <Fields>
                                <asp:BoundField   DataField= "ProductId "   HeaderText= "ProductId "   SortExpression= "ProductId "   />
                                <asp:BoundField   DataField= "Image "   HeaderText= "Image "   SortExpression= "Image "   />
                                <asp:BoundField   DataField= "UnitCost "   HeaderText= "UnitCost "   SortExpression= "UnitCost "   />
                                <asp:BoundField   DataField= "Supplier "   HeaderText= "Supplier "   SortExpression= "Supplier "   />
                                <asp:BoundField   DataField= "Status "   HeaderText= "Status "   SortExpression= "Status "   />
                                <asp:BoundField   DataField= "ListPrice "   HeaderText= "ListPrice "   SortExpression= "ListPrice "   />
                                <asp:BoundField   DataField= "Name "   HeaderText= "Name "   SortExpression= "Name "   />
                                <asp:BoundField   DataField= "ItemId "   HeaderText= "ItemId "   SortExpression= "ItemId "   />
                        </Fields>