row updating in gridview

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C#

ASP.NET

XML

file

hi....


I developed an application with gridview control and one xml file.

I bind xml data to gridview.Its working fine.But at the time of editing it shows an error like this
Unable to cast object of type 'System.Data.DataTable' to type 'System.Data.DataSet'.

My design is:

<asp:GridView ID="grdv" runat="server" AutoGenerateColumns="False" AutoGenerateEditButton="True" Height="67px" Width="214px" onrowcancelingedit="grdv_RowCancelingEdit" onrowediting="grdv_RowEditing" onrowupdating="grdv_RowUpdating"  >
      <columns>
       <asp:TemplateField             HeaderText="CompanyName">
<itemtemplate>
<%# Eval("CompanyName") %>

                        </itemtemplate>

<edititemtemplate>
<asp:TextBox ID="txtJobTitle1" runat="Server" Text='<%#Eval("CompanyName")%>'Columns="30">

        </edititemtemplate>
       
  <asp:TemplateField HeaderText="Description">
<itemtemplate>
<%# Eval("Description")%>
</itemtemplate>
      <edititemtemplate>
<asp:TextBox ID="txtDescription1" runat="Server" Text='<%# Eval("Description")%>'Columns="30">
 </edititemtemplate>
  
                           
</columns>

My CS flle is:

public partial class Admin : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        //txtJobTitle.Focus();
        //txtDescription.Focus();
        GetData();

    }
protected void grdv_RowEditing(object sender, GridViewEditEventArgs e)
    {
        grdv.EditIndex = e.NewEditIndex;
        GetData();
       
    }
    protected void grdv_RowUpdating(object sender, GridViewUpdateEventArgs e)
    {
        //GridViewRow row = (GridViewRow)grdv.Rows[e.RowIndex];
        int i = grdv.Rows[e.RowIndex].DataItemIndex;
        //TextBox txtName = (TextBox)GridView1.Rows[e.RowIndex].FindControl("txtName");
      TextBox CompanyName = ((TextBox)grdv.Rows[e.RowIndex].FindControl("txtJobTitle1"));
      TextBox Description = ((TextBox)grdv.Rows[e.RowIndex].FindControl("txtDescription1"));

        //int i = grdv.Rows[e.RowIndex].DataItemIndex;
        //string CompanyName = ((TextBox)grdv.Rows[e.RowIndex].Cells[1].Controls[0]).Text;
        //string Description = ((TextBox)grdv.Rows[e.RowIndex].Cells[2].Controls[0]).Text;
        grdv.EditIndex = -1;
        GetData();
        DataSet dss =(DataSet)grdv.DataSource;

        dss.Tables[0].Rows[i]["CompanyName"] = CompanyName;
        dss.Tables[0].Rows[i]["Description"] = Description;
        dss.WriteXml(Server.MapPath("XMLJobFile.xml"));
        GetData();

    }
    protected void grdv_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
    {
        grdv.EditIndex = -1;
        GetData();

    }
    protected void GetData()
    {
        DataSet ds = new DataSet();
        ds.ReadXml(Server.MapPath("XMLJobFile.xml"));
        grdv.DataSource = ds.Tables[0];
        grdv.DataBind();
    }
    
}

And my Xml file is:

<<pre lang="xml">?xml version="1.0" standalone="yes"?>
<JOBS>
  <Fresher>
    <CompanyName>
         Rayars Group: </CompanyName>
    <Description>
      We are looking for Graduates (B.sc/B.com and other non-engineering streams) who have decent knowledge about webdesigning
       </Description>
  </Fresher>
</JOBS>

have to update the row with new value and the changes are reflected to xml file.
Please give any solution