EditItemTemplate values not getting read properly - asp.net

Question

I am trying to build a simple GridView.
I have a Products table and it contains ProductID and ModelName.
I am using LINQ to SQL
My GridView code is
<asp:GridView ID="GridView1" runat="server" DataSourceID="objData" AutoGenerateColumns="false" AutoGenerateEditButton="true" DataKeyNames="ProductID,ModelName">
<Columns>
<asp:TemplateField HeaderText="Product ID">
<ItemTemplate>
<asp:Label runat="server" Text='<%#Eval("ProductID") %>'/>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Model Name">
<ItemTemplate>
<asp:Label ID="Label1" runat="server" Text='<%#Eval("ModelName") %>'/>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox runat="server" Text='<%#Eval("ModelName") %>'/>
</EditItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
and my datasource code is
<asp:ObjectDataSource ID="objData" runat="server" SelectMethod="GetAll" UpdateMethod="UpdateProduct"
DataObjectTypeName="TestLINQProto.tblProduct" TypeName="TestLINQProto.ProductsList"></asp:ObjectDataSource>
I have my update method written like this
[DataObjectMethod(DataObjectMethodType.Update,true)]
public void UpdateProduct(tblProduct product)
{
EshopDataAccess.UpdateProduct(product);//This will call a LINQ function to update the product
}
The issue is that the tblProduct that the UpdateProduct contain original values. It is not getting the updated values.

Answer 1

I think the issue is that you are using Eval method which only supports reading/fetching of data. Use Bind Method in your grid aspx code. Like this
<asp:GridView ID="GridView1" runat="server" DataSourceID="objData" AutoGenerateColumns="false" AutoGenerateEditButton="true" DataKeyNames="ProductID,ModelName">
<Columns>
<asp:TemplateField HeaderText="Product ID">
<ItemTemplate>
<asp:Label runat="server" Text='<%#Eval("ProductID") %>'/>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Model Name">
<ItemTemplate>
<asp:Label ID="Label1" runat="server" Text='<%#Eval("ModelName") %>'/>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox runat="server" Text='<%#Bind("ModelName") %>'/>
</EditItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>