запусти профайлер SQL servera и астрой его на перехват запроса 'Table' и увидишь update как проходит id передается?

выкладывай код правильный (компилённый), может нах этих мастеров.

<asp:GridView ID="GridView1" Runat="server"
OnRowUpdating="GridView1_UpdateCommand"
OnRowEditing="GridView1_RowEditing"
OnRowDeleting="GridView1_RowDeleting"
OnSelectedIndexChanged="GridView1_SelectedIndexChanged"
OnRowCancelingEdit = "GridView1_OnRowCancelingEdit"
DataKeyNames ="Phone_Id,Phone_Func_Id"
AutoGenerateColumns ="False"
HorizontalAlign ="Center"
PageSize="150"

Width="99%"
CellPadding="4" ForeColor="#333333" GridLines="None">
<HeaderStyle HorizontalAlign="Center" BackColor="#1C5E55" BorderColor="#00AAAA"
ForeColor="White" CssClass="TxtBold"></HeaderStyle>
<Columns>
<asp:BoundField Visible="False" DataField="Phone_Id" />
<asp:BoundField HeaderText="Название функции телефона " ReadOnly="True" DataField="Phone_Func_Title" SortExpression="Phone_Func_Title">
<ControlStyle Width="20%" />
<ItemStyle CssClass="Txt" Width="20%" />
</asp:BoundField>
<asp:TemplateField HeaderText="Описание функции телефона" SortExpression="Phone_Func_Value">
<EditItemTemplate>
<asp:TextBox ID="TextBox1" runat="server" Text='<%# Bind("Phone_Func_Value") %>'></asp:TextBox>
</EditItemTemplate>
<ControlStyle Width="100%" />
<ItemStyle CssClass="Txt" Width="100%" />
<ItemTemplate>
<asp:Label ID="Label1" runat="server" Text='<%# Bind("Phone_Func_Value") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:CheckBoxField Visible="False" HeaderText="Показать" DataField="IsShow" />

<asp:CommandField
CancelText="Отменить"
DeleteText="Удалить"
ShowDeleteButton ="True"
EditText="Редактировать"
ShowEditButton="True"
UpdateText="Сохранить" />

</Columns>
<FooterStyle BackColor="#1C5E55" Font-Bold="True" ForeColor="White" />
<RowStyle BackColor="#E3EAEB" />
<EditRowStyle BackColor="PaleTurquoise" />
<SelectedRowStyle BackColor="#C5BBAF" Font-Bold="True" ForeColor="#333333" />
<PagerStyle BackColor="#666666" ForeColor="White" HorizontalAlign="Center" />
<AlternatingRowStyle BackColor="White" />

</asp:GridView>

обработка
//------------------------------------------------------------
protected void GridView1_UpdateCommand(object sender, GridViewUpdateEventArgs e)
{
GridViewRow row = GridView1.Rows[e.RowIndex];
TextBox t = row.FindControl("TextBox1") as TextBox;
UPDATE(Phone_id, int.Parse(GridView1.DataKeys[e.RowIndex].Values[1].ToString()), t.Text, int.Parse(ClientID.ToString()));

GridView1.EditIndex = -1;
Bind();
}
//---------------------------------------------------------------------------------------------------
protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
{
GridView1.EditIndex = e.NewEditIndex;

Bind();

}
//---------------------------------------------------------------------------------------------------