Supplier:
<asp:LinkButton ID="lnkSupplier" Text='<%#Bind("column_Name") %>' runat="server" CommandName="SupplierLink" CommandArgument='<%#Bind("Column_Name") %>'></asp:LinkButton></br>

Category
<asp:LinkButton ID="lnkCategory" Text='<%#Bind("column_Name") %>' runat="server" CommandName="CategoryLink" CommandArgument='<%#Bind("Column_Name") %>'></asp:LinkButton>

 protected void DataList1_ItemCommand(object source, DataListCommandEventArgs e)
    {
       
        if (e.CommandName == "SupplierLink")// Supplier Link button clicked

	......   //can get the url/data  from e.CommandArgument
        else
         ......
    }