Select, Add, Update, and Delete Data in a ASP.NET GridView

Question

I am working on a gridview1. This gridview is binded to more then 100 table 

 and displaying data correctly.

 

 gridview1

<asp:GridView ID="gvIPMSDetails" runat="server"  />

<Columns>

<asp:CommandField ShowEditButton="True" />

<asp:CommandField ShowDeleteButton="True" />

</Columns>

</asp:GridView>

 

but problem is , i am unable to purform insert ,update ,delete task.

how should i revolve this.

  

Note:-Tables doesn't have primery key .some table have rowid(not all).

Cant change table structure at any cost.

 

eagerly waitng for the response. 

Thanks in advance