XML Files is not getting updated through Asp.net

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C#

ASP.NET

Hi There i am trying to update my xml file through a editor in asp.net but does not updates.
It works fine on Local and Development server.but not working on production server.

I am Pasting my code Down here help me with it.


This i Did because as soon as i click on Update button of my CorporateCharities.aspx page i was getting thrown to login.aspx page so the below code i wrote for page load of login page.

private void WriteToItemDataset(string ItemNo)
{
    DataSet ds = new DataSet();
    DataTable dt = new DataTable("Items");
 
if (Session["dtItemData"] != null)
{
    dt = (DataTable)Session["dtItemData"];
}
if (ItemNo != string.Empty)
{
    foreach (DataRow row in dt.Rows)
    {
        if (!Convert.ToBoolean(row["DeletedFlag"])&& ItemNo == Convert.ToString(row["ItemNo"]))
        {
            row["ItemDescription"] = Editor3.Value;
            dt.AcceptChanges();
            break;
        }
    }
 
 DataView dv = dt.DefaultView;
dv.Sort = "DeletedFlag,ItemNo";
Session["dtItemData"] = dt;
string Filepath = Server.MapPath("~/CorporateCharities_Content.xml");
 
if (File.Exists(Filepath))
{
   dt.WriteXml(Filepath,true);
   this.errorMessageHtmlCell.Attributes.Add("style", "color:Green");
   this.errorMessageHtmlCell.InnerText = "Record(s) saved successfully.";
}
else
{
   this.errorMessageHtmlCell.Attributes.Add("style", "color:Red");
   this.errorMessageHtmlCell.InnerText = "File Not Found.";
}


protected void Submit_Click(object sender, EventArgs e)
        {
               string ItemNo = Convert.ToString(Session["EditValue"]);
                this.WriteToItemDataset(ItemNo);
                this.errorMessageHtmlCell.InnerText = "Record(s) saved successfully."; //+ ItemNo;
                this.errorMessageHtmlCell.Attributes.Add("style", "color:Green");
                BindDataLIst();
                Editor3.Value = "";
                trMsgContent.Visible = true;
                trEditorMsg.Visible = false;                
                       
        }