Data Controls :: Insert Record To Database When Enter Key Is Pressed Inside TextBox In GridView

I am using gridview with some columns few are :

<asp:templatefield headertext="Title Description" sortexpression="Description">
<itemtemplate>
<asp:Label id="Description" runat="server" Text='<%# Bind("Description")%>'></asp:Label>
</itemtemplate>
<edititemtemplate>
<asp:textbox id="Description" runat="server" CssClass="form-control" text='<%# Bind("Description") %>' />

[Code] ....

Now this AddGridAddBTN Temporarily adds a data row to a grid but won't submit that data to database, however AddGridSubmitBTN Submits the data to DB through foreach loop .

Now my query is i want to provide user a functionality that when he gets focus on Abbreviation Text Box OR Description Box and he after typing some data Press ENTER KEY , This ENTER KEY would provide funcionality as a AddGridAddBTN Button , and when he presses SHIFT + ENTER , It works like AddGridSubmitBTN Button , also i want to make Abbreviation and Description Field to be filled must ! 

Moral is that :

ENTER KEY WOULD DO : Generate a temporary row with holding previous values as it is actually doing on AddGridAddBTN Button.

SHIFT + ENTER WOULD DO : Enter the whole grid data thorugh foreach loop as it is actually doing on AddGridSubmitBTN Button.

I don't want to refresh my page on enter or shift enter pressing . This grid is binded through SQL DATA SOURCE ...