fin row index on button in gridview in asp.net with c#

<asp:TemplateField>
<ItemTemplate>
<asp:Button ID="IncreasePriceButton" runat="server"
Text="+10%"
CommandName="IncreasePrice"
CommandArgument='<%# Container.DataItemIndex %>' />
<asp:Button ID="DecreasePriceButton" runat="server"
Text="-10%"
CommandName="DecreasePrice"
CommandArgument='<%# Container.DataItemIndex %>' />
</ItemTemplate>
</asp:TemplateField>




int index = Convert.ToInt32(e.CommandArgument);