pass parameter into a function with asp:Button
in your aspx
<asp:Button ID="test" runat="server" CommandArgument='<%#Eval("product.ProductId")%>' CommandName="ThisBtnClick" OnClick="MyBtnHandler" />in code behind
void MyBtnHandler(Object sender, EventArgs e){ Button btn = (Button)sender; switch (btn.CommandName) { case "ThisBtnClick": DoWhatever(btn.CommandArgument.ToString()); break; case "ThatBtnClick": DoSomethingElse(btn.CommandArgument.ToString()); break; }}