<asp:ListView ID="LstDemands" runat="server" OnItemDataBound="lstListView_ItemDataBound" DataKeyNames="id">
<LayoutTemplate>
        <table border="0" cellspacing="0" cellpadding="2" ID="itemPlaceholderContainer" runat="server" width="100%" >
					<tr id="Tr2" runat="server" style="color:#000000; background-color: #B7C2D3;">
                 <td id="Td25" width="110px" runat="server" align="center"><b>ID</b></td>
				<td id="Td3" runat="server" align="center" width="50"><b>№</b></td>
                <td id="Td4" runat="server" align="center" width="170"><b>ФИО</b></td>
					</tr>
                    <tr ID="itemPlaceholder" runat="server"> </tr>
				</table>
                
        </LayoutTemplate>

<ItemTemplate>
        <tr id="Tr20" runat="server" >
        <td id="Td21" runat="server">
           <asp:LinkButton ID="lbtnEdit" Width="25px" Text='<%# DataBinder.Eval(Container.DataItem, "id")%>' OnCommand="btnEdit_Click" CommandArgument='<%# DataBinder.Eval(Container.DataItem, "id")%>' runat="server" ></asp:LinkButton>
        </td>
        <td id="Td22" runat="server"><asp:Label ID="lblNum" runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "Number")%>'></asp:Label></td>
        <td id="Td23" runat="server"><asp:Label ID="lblCliLastName" runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "lname")%>'></asp:Label>&nbsp;
                <asp:Label ID="lblCliFirstName" runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "fname")%>'></asp:Label>&nbsp;
                <asp:Label ID="lblCliMidName" runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "mname")%>'></asp:Label></td>
        </tr>
        </ItemTemplate>

        </asp:ListView> 

class Test
{
string id;
string Num;
....
}


protected void btnEdit_Click(object sender, CommandEventArgs e)
{
Test t = new Test();
t = LoadData(e.CommandArgument.ToString()); // загружаю данные в класс
txtId.Text = t.id;
txtNumber.Text = t.Num;
.....
}