How to Retain or Persist async postback upload file ,when post back happend In RadGrid View,Upto click on insert column..

[Sairam]

 

<div id="highlighter_18338" class="tFormatCodeBlock supportThreadCodeBlock" style="border: 1px solid rgb(127, 157, 185); overflow-y: auto;">
<div style="background-color: rgb(255, 255, 255);"><font style="margin-left: 0px ! important;"><code style="color: #000000;"> <telerik:GridTemplateColumn Visible="true" DataField="Signature" HeaderText="Signature"<br>
                    HeaderStyle-HorizontalAlign="Center" ItemStyle-HorizontalAlign="Center" UniqueName="Signature"><br>
                    <ItemTemplate><br>
                        <telerik:RadBinaryImage ID="RadBinaryImage1" runat="server" DataValue='<%#Eval("Signature") is DBNull ? null : Eval("Signature")%>'<br>
                            AutoAdjustImageControlSize="false" ResizeMode="Fit" Height="50px" Width="120px" /><br>
                    </ItemTemplate><br>
                    <InsertItemTemplate><br>
                        <telerik:RadAsyncUpload runat="server" ID="ImgImages2" AllowedFileExtensions=".jpg,.jpeg,.png,.gif"<br>
                            MaxFileInputsCount="1" Skin="Outlook" Width="110px" /><br>
                        <asp:Label ID="lblupload2" runat="server" Visible="true" CssClass="error"></asp:Label><br>
                    </InsertItemTemplate><br>
                    <EditItemTemplate><br>
                        <telerik:RadAsyncUpload runat="server" ID="ImgImages" AllowedFileExtensions=".jpg,.jpeg,.png,.gif"<br>
                            MaxFileInputsCount="1" Skin="Outlook" Width="110px" /><br>
                        <asp:Label ID="lblupload1" runat="server" Visible="true" CssClass="error"></asp:Label><br>
                    </EditItemTemplate><br>
<br>
<br>
                </telerik:GridTemplateColumn><br>
<br>
 <telerik:GridTemplateColumn Visible="true" DataField="chkNumber" HeaderText="Check Number"<br>
                    HeaderStyle-HorizontalAlign="Center" ItemStyle-HorizontalAlign="Center" UniqueName="chkNumber"><br>
                   <br>
                    <ItemTemplate><br>
                        <%# Eval("chkNumber")%><br>
                    </ItemTemplate><br>
<EditItemTemplate><br>
                        <telerik:RadTextBox ID="rdtxtchkNumber" runat="server" Width="160px" MaxLength="4"<br>
                            onclick="shouldConfirm = true;" Text='<%# Eval("chkNumber") %>'><br>
                        </telerik:RadTextBox><br>
                        <telerik:RadButton ID="RbtnReset" runat="server" Width="40px" CausesValidation="false"<br>
                            Text="Reset" OnClick="RbtnResetCheckNo_Click"><br>
                        </telerik:RadButton><br>
                       <br>
                      <br>
                    </EditItemTemplate><br>
                </telerik:GridTemplateColumn><br></code></font></div></div>





The following code inside the rad Grid ,when user upload file and click on "reset" button i don't want to loss the file ,
how many post back are happens i don't want to loss data,Only when user click 's on insert or Edit of
Rad Grid I want to insert or update the data.