asp.net下linkbutton的前后台使用方法

<asp:LinkButton runat="server" ID="lbtnUp" CommandArgument='<%#Eval("id") %>' OnClick="lbtnUp_Click">修改</asp:LinkButton>

protected void lbtnUp_Click(object sender, EventArgs e)
{
string id = ((LinkButton)sender).CommandArgument;
common.salert(id);

}