Unable to Update modified text into gridview

[Marshall]

Hi
In this code everything works fine without any errors, when i edit the row it goes well, but when i change the text in the textbox and press update it still shows the same in gridview row. it doesn't update the latest modified text into GridView. Can u please help me...i was struck here from many days.


Here is my code...

Design:

<asp:GridView ID="GridView1" runat="server" AllowPaging="True" PageSize="5" AutoGenerateColumns="false" OnRowCommand="Gridview1_RowCommand"
    OnPageIndexChanging="GridView1_PageIndexChanging" Width="933px"  HorizontalAlign="Center" OnRowEditing="GridView1_RowEditing"
     OnRowCancelingEdit="GridView1_RowCanceling" OnRowUpdating="GridView1_RowUpdating"  DataKeyNames="id" >
   <HeaderStyle Font-Names="Arial" Width="100px" BackColor="ForestGreen" ForeColor="Black" />
   <PagerSettings FirstPageText="last" NextPageText="first" />   
   <Columns>
   <asp:BoundField HeaderText="Date" DataField="Date" >
       <ItemStyle Width="150px" />
   </asp:BoundField>
   <asp:TemplateField HeaderText="Update" >
   <ItemTemplate>
   <asp:Label ID="Updatelbl" runat="server" Text='<%#Eval("Update")%>'> </asp:Label>
   </ItemTemplate>
   <EditItemTemplate>
   <asp:TextBox ID="UpdateTxt" runat="server" TextMode="MultiLine" ReadOnly="false" Text='<%#Eval("Update")%>' Height="25" Width="650"></asp:TextBox>
   </EditItemTemplate>
   </asp:TemplateField>
    <asp:TemplateField HeaderText="Action">
    <ItemTemplate>
    <asp:LinkButton ID="Editbtn" Text="Edit" runat="server" CommandName="Edit"/>
    </ItemTemplate>
    <EditItemTemplate>
    <asp:LinkButton ID="Updatebtn" Text="Update" runat="Server" CommandName="Update" />
 
    <asp:LinkButton ID="Cancelbtn" Text="Cancel" runat="server" CommandName="Cancel" /> 
    </EditItemTemplate>
    </asp:TemplateField>
   </Columns>   
   </asp:GridView>
 

protected void Page_Load(object sender, EventArgs e)
    {
        showupdates();
        GridView1.DataBind();
    }
 
    protected void Button1_Click1(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            if (TextBox1.Text != "")
            {
                string xmlFilePath = System.AppDomain.CurrentDomain.BaseDirectory + "\\XMLfile.xml";
                XmlDocument xmlDoc = new XmlDocument();
                xmlDoc.Load(xmlFilePath);
                XmlElement newtasks = xmlDoc.CreateElement("Tasks");
                XmlElement newupdate = xmlDoc.CreateElement("Update");
                XmlElement newid = xmlDoc.CreateElement("id");
                XmlNodeList List = xmlDoc.SelectNodes("/Updations/Tasks/id");
                int nid = List.Count;
                if (nid != 0)
                    nid++;
                else
                    nid = 1;
                newid.InnerText = nid.ToString();
                newtasks.AppendChild(newid);
                XmlElement date = xmlDoc.CreateElement("Date");
                date.InnerText = DateTime.Now.ToString("dd-MMM-yyyy");
                newupdate.InnerText = TextBox1.Text;
                newtasks.AppendChild(date);
                newtasks.AppendChild(newupdate);
                xmlDoc.Save(xmlFilePath);
                xmlDoc.DocumentElement.InsertAfter(newtasks, xmlDoc.DocumentElement.LastChild);
                FileStream fsxml = new FileStream(xmlFilePath, FileMode.Truncate, FileAccess.Write, FileShare.ReadWrite);
                xmlDoc.Save(fsxml);
                xmlDoc = null;
                fsxml.Flush();
                fsxml.Close();
                fsxml.Dispose();
                showupdates();
                TextBox1.Text = "";
            }
        }
    }
 
    protected void showupdates()
    {
            DataSet ds = new DataSet();
            ds.ReadXml(System.AppDomain.CurrentDomain.BaseDirectory + "\\XMLfile.xml");
            GridView1.DataSource = ds.Tables[0];
            GridView1.DataBind();        
    }
 
    protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e)
    {
        GridView1.PageIndex = e.NewPageIndex;
        GridView1.DataBind();
    }
    protected void  GridView1_RowEditing(object sender, GridViewEditEventArgs e)
    {
        GridView1.EditIndex = e.NewEditIndex;
        GridView1.DataBind();
    }
    protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
    {
        int i = e.RowIndex;
        DataSet ds = new DataSet();        
        ds.ReadXml(System.AppDomain.CurrentDomain.BaseDirectory + "\\XMLfile.xml");        
        ds.Tables[0].Rows[e.RowIndex][2] = ((TextBox)GridView1.Rows[e.RowIndex].FindControl("UpdateTxt")).Text;     
        GridView1.EditIndex = -1;
        ds.WriteXml(System.AppDomain.CurrentDomain.BaseDirectory + "\\XMLfile.xml");
        showupdates();
    }