GridView DataBinding to a DataTable and row deleting problems

[Andy B]

I have the following gridview. There are 2 other textBoxes and a button on
the page as well. When somebody puts text into the 2 textBoxes and presses
the add button, it puts the values of those textBoxes into the DataTable.
The gridView shows what values have already been entered into the DataTable.
<asp:GridView ID="DefinitionL ist" runat="server" Caption="Dictio nary
entries" EmptyDataText=" There are no definitions yet." AllowPaging="Tr ue"
AutoGenerateCol umns="False" AutoGenerateDel eteButton="True "
AutoGenerateEdi tButton="True" OnRowDeleting=" DefinitionList_ RowDeleting"
DataKeyNames="I D">
<Columns>
<asp:BoundFie ld DataField="Word "
HeaderText="Wor d"></asp:BoundField>
<asp:BoundFie ld DataField="Defi nition"
HeaderText="Def inition"></asp:BoundField>
</Columns>
</asp:GridView>

Here is the code that runs the add button. Everything works fine here the
way I would want it to. The problem comes in with the gridView above. When I
press the delete button, it wipes out the whole DataTable (all of the rows)
not just one of them. How would I make it delete only the row I want to get
rid of?
private void AddDefinition() {
///Todo: Add validation for empty values
Contract StockContract = (Contract)Sessi on["StockContr act"];
//Create a linq query to determine if the word already exists in the
dictionary. If it does, return the GridView caption as an error.
var Query = from Counter in StockContract.D ictionary.AsEnu merable() where
Counter.Field<s tring>("Word") == WordTextBox.Tex t
select new { Word = Counter.Field<s tring>("Word") };
if(WordTextBox. Text==String.Em pty || DefinitionTextB ox.Text ==
String.Empty) {
DefinitionList. Caption = "Empty entries aren't allowed! Type a word and
definition in the boxes above and press the add button.";
}
//Since the word didn't exist in the dictionary, go ahead and add it.
else if(Query.Count( )==0) {
DataRow Row = StockContract.D ictionary.NewRo w();
Row["Word"] = WordTextBox.Tex t;
Row["Definition "] = DefinitionTextB ox.Text;
StockContract.D ictionary.Rows. Add(Row);
DefinitionList. Caption = "Dictionary entries";
//resave after every add of a word to the dictionary
Session["StockContr act"] = StockContract;
} else {
DefinitionList. Caption = "That word is already in the dictionary, try
again!";
}
DefinitionList. DataSource = StockContract.D ictionary;
DefinitionList. DataBind();
WordTextBox.Tex t = String.Empty;
DefinitionTextB ox.Text = String.Empty;
}