C# Dev Express AspxGridView

<dx:ASPxGridView ID="grdmarket" runat="server" AutoGenerateColumns="False"
KeyFieldName="pid" onrowdeleting="grdmarket_RowDeleting"
önrowupdating="grdmarket_RowUpdating"
önhtmlrowcreated="grdmarket_HtmlRowCreated">
<columns> <dx:gridviewcommandcolumn visibleindex="0" xmlns:dx="#unknown">
<editbutton visible="True">

<deletebutton visible="True">

<clearfilterbutton visible="True">


<dx:gridviewdatatextcolumn fieldname="pid" visible="false" visibleindex="1" xmlns:dx="#unknown">

<dx:gridviewdatatextcolumn fieldname="marketname" visibleindex="2" caption="Market Name" xmlns:dx="#unknown">

<dx:gridviewdatacomboboxcolumn fieldname="country" visibleindex="3" caption="Country" xmlns:dx="#unknown">

<dx:gridviewdatacomboboxcolumn fieldname="city" visibleindex="4" caption="City" xmlns:dx="#unknown">

<dx:gridviewdatacomboboxcolumn fieldname="state" visibleindex="5" caption="State" xmlns:dx="#unknown">

<dx:gridviewdatatextcolumn fieldname="contactperson" visibleindex="6" caption="Contact Person" xmlns:dx="#unknown">

<dx:gridviewdatatextcolumn fieldname="contactno" visibleindex="7" caption="Contact No." xmlns:dx="#unknown">

<dx:gridviewdatamemocolumn fieldname="address1" visibleindex="8" caption="Address1" xmlns:dx="#unknown">

<dx:gridviewdatamemocolumn fieldname="address2" visibleindex="9" caption="Address2" xmlns:dx="#unknown">

<dx:gridviewdatatextcolumn fieldname="email" visibleindex="10" caption="Email" xmlns:dx="#unknown">

<dx:gridviewdatatextcolumn fieldname="pincode" visibleindex="11" caption="Pincode" xmlns:dx="#unknown">

<dx:gridviewdatatextcolumn visibleindex="12" caption="Image" fieldname="imageurl" xmlns:dx="#unknown">
<dataitemtemplate>
<dx:ASPxImage ID="txtimage" runat="server">

<edititemtemplate>
<dx:ASPxUploadControl ID="txtimage" runat="server">



<settings showfilterrow="True" showgrouppanel="True">



This is the Aspx page code.. and i want to get the imageurl at runtime when i update the grid it will give the object refrence not found..


if (e.RowType == GridViewRowType.EditForm)
{
// if (e.RowType == GridViewRowType.EditForm) return;
ASPxUploadControl image1 = grdmarket.FindEditRowCellTemplateControl(grdmarket.Columns["imageurl"]
as GridViewDataColumn, "txtimage") as ASPxUploadControl;
if(image1.HasFile)
filename = image1.FileName;
}
when html row created event is genrated this code will run when edit the grid but i am not accissible to get the imageurl